CN117826449A

CN117826449A - Contact lens and method for producing a contact lens

Info

Publication number: CN117826449A
Application number: CN202211194811.0A
Authority: CN
Inventors: 罗伯特·汉威赛德; 约翰·芒特福德; 兰迪·考吉马; 帕特里克·J·卡罗琳; 大卫·J·巴雷托
Original assignee: Carter Design Group Co ltd
Current assignee: Carter Design Group Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2024-04-05

Abstract

The invention provides a cornea shaping contact lens, comprising a contact lens diameter, a back surface and a front surface, and at least three regions: an optical region; a middle region comprising a middle region size, a rear surface reversal arc, and a preset reversal arc depth (RCD); and an alignment area comprising an alignment area size and an alignment contour that contacts the eye at the contact chord when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from eye shape data of the eye to which the cornea shaping contact lens is to be worn. The invention also provides a method for calculating the design of the cornea shaping contact lens, a method for manufacturing the cornea shaping contact lens, a method for adjusting the size of the cornea shaping contact lens and a method for manufacturing the cornea shaping contact lens with the adjusted size.

Description

Contact lens and method for producing a contact lens

Technical Field

The present invention relates to contact lenses, methods of making contact lenses, methods of adjusting the dimensions of contact lenses, and contact lenses made by the methods. More particularly, in one aspect, the present invention relates to a contact lens and a method of making a contact lens that includes three or more regions defined by at least one curve in an optical region; depth in the middle region; and an angle in the peripheral region. In another particular aspect, the invention relates to adjusting one or more lens parameters with a lens diameter and a contact lens made by the method.

Background

Contact lenses are used for a variety of reasons such as vision correction, decoration and treatment. Contact lenses are worn for decorative and aesthetic reasons. Other reasons for their wear include improved peripheral vision, as well as functional and optical reasons. Certain types of contact lenses are used to remodel the cornea to reduce refractive errors such as those caused by myopia, hyperopia, and astigmatism. This procedure is known as keratoplasty.

Typically, the keratoplasty lens is modeled based on the patient's corneal topography data. The practitioner can then use the commercial product to make a cornea shaping lens or series of lenses for the patient. Commercial products can be augmented by the practitioner's own knowledge.

By 2050, nearly half of the population worldwide will have myopia. Improved or alternative cornea-shaping contact lenses remain desirable.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge.

Disclosure of Invention

Examples of the present invention relate generally to contact lenses, methods of making contact lenses, methods of adjusting the dimensions of contact lenses, and contact lenses made by the methods.

In one broad form, the present invention relates to a contact lens, a method of making a contact lens, a method of adjusting the dimensions of a contact lens, and a contact lens made by these methods, the contact lens comprising three or more regions defined by: a curve in the optical zone; depth in the middle region; and an angle in the peripheral region.

In another general form, the present invention is directed to a method of adjusting the size of a contact lens, and a contact lens made by the size adjustment method, the method comprising adjusting one or more lens parameters with a lens diameter.

In a first aspect, although not necessarily the only or indeed the broadest aspect, the present invention provides a contact lens for shaping the cornea comprising: contact lens diameter, posterior and anterior surfaces, and at least three regions: an optical zone comprising an optical zone size and a front-back surface base curve, the optical zone producing a fluid reservoir comprising a base curve height determined by a tear layer depth when worn on an eye; a middle region comprising a middle region size, a front-to-back surface reversal arc and a preset reversal arc depth, the front-to-back surface reversal arc being aligned with the base arc height, and the middle region size being related to the preset reversal arc depth; and an alignment area comprising an alignment area size and an alignment contour that contacts the eye at the contact chord when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from eye shape data of an eye to which the cornea-shaping contact lens is to be worn.

In a second aspect, the present invention provides a method of calculating a cornea-shaping contact lens design, the method comprising: receiving eye data including order and eye shape data for corrective lenses; receiving one or more cornea-shaping contact lens parameters comprising a cornea-shaping contact lens diameter; calculating a cornea-shaping contact lens design from the received eye data, the cornea-shaping contact lens design comprising the received cornea-shaping contact lens diameter and comprising: an optical zone comprising an optical zone size and a front-back surface base curve, the optical zone producing a fluid reservoir comprising a base curve height determined by a tear layer depth when worn on an eye; a middle region comprising a middle region size, a front-to-back surface reversal arc and a preset reversal arc depth, the front-to-back surface reversal arc being aligned with the base arc height, and the middle region size being related to the preset reversal arc depth; and an alignment area comprising an alignment area size and an alignment contour that contacts the eye at the contact string when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from the eye shape data.

In a third aspect, the present invention provides a method of making a contact lens for shaping the cornea, the method comprising: receiving eye data including order and eye shape data for corrective lenses; receiving one or more cornea-shaping contact lens parameters comprising a cornea-shaping contact lens diameter; calculating a cornea-shaping contact lens design from the received eye data, the cornea-shaping contact lens design comprising the received cornea-shaping contact lens diameter and comprising: an optical zone comprising an optical zone size and a posterior surface base curve, the optical zone producing a fluid reservoir comprising a base curve height determined by a tear layer depth when worn on an eye; a middle region comprising a middle region size, a rear surface reversal arc and a preset reversal arc depth, the rear surface reversal arc being aligned with the base arc height, and the middle region size being related to the preset reversal arc depth; and an alignment area comprising an alignment area size and an alignment contour that contacts the eye at the contact string when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from the eye shape data; and applying the calculated corneal shaped contact lens design to a contact lens to produce a corneal shaped contact lens.

In a fourth aspect, the present invention provides a method of adjusting the size of a cornea-shaping contact lens, the method comprising: receiving the initial cornea-shaping contact lens design comprising an initial cornea-shaping contact lens diameter, an initial optical zone size, an initial intermediate zone size, and at least one initial peripheral zone parameter, and further receiving a resized cornea-shaping contact lens diameter; and scaling at least one of the initial intermediate zone dimensions to a resized intermediate zone dimension that integrates the difference between the initial cornea-shaping contact lens diameter and the resized cornea-shaping contact lens diameter and aligns with the initial optical zone and the peripheral zone to provide a resized cornea-shaping contact lens.

In a fifth aspect, the present invention provides a method of making a resized contact lens corneal shaping, the method comprising: receiving the initial cornea-shaping contact lens design comprising an initial cornea-shaping contact lens diameter, an initial optical zone size, an initial intermediate zone size, and at least one peripheral zone parameter, and further receiving a resized cornea-shaping contact lens diameter; scaling at least one intermediate zone dimension to a resized intermediate zone dimension to integrate a difference between the initial cornea-shaping contact lens diameter and the resized cornea-shaping contact lens diameter, and aligning with the initial optical zone and the initial peripheral zone to provide a resized cornea-shaping contact lens; and applying the scaled at least one of the intermediate zone dimensions to a cornea shaping contact lens design to produce the cornea shaping contact lens.

In a sixth aspect, the method according to the fourth aspect allows for adjusting the dimensions of the contact lens of the first aspect or of a contact lens designed according to the second aspect or of a contact lens made according to the third aspect.

In a seventh aspect, the method according to the fifth aspect allows for adjusting the dimensions of the contact lens of the first aspect or of a contact lens designed according to the second aspect or of a contact lens manufactured according to the third aspect.

According to any of the fourth, fifth, sixth or seventh aspects, the method may comprise: the pre-set reverse arc depth (RCD) is maintained by recalculating the back surface reverse arc to align the base arc height at the resized intermediate region size.

In a ninth aspect, the present invention provides a computer system for performing any one of the second to seventh aspects.

In a tenth aspect, the present invention provides a computer program code means for performing any of the second to seventh aspects.

In one example of any of the ninth or tenth aspects, one or more of the received eye data, the received cornea-shaping contact lens diameter, the received initial cornea-shaping contact lens design, and the resized cornea-shaping lens diameter may be received from a local or remote computer. The received information may be received from one or more networks.

In an eleventh aspect, the present invention provides a contact lens made according to any one of the second to eleventh aspects.

According to any of the above aspects, the eye data may include right eye data and left eye data.

According to any of the above aspects, the eye data may further comprise a visible iris diameter.

According to any of the above aspects, the eye shape data may comprise eye topography data (eye topography data) and/or cornea measurement data. The ocular topography data may comprise corneal and/or scleral topography data. The keratometric data may include one or more K readings.

According to any of the above aspects, the received contact lens diameter may be received as a default value or as input from a remote or local computer or database.

According to any of the above aspects, the one or more cornea-shaping contact lens parameters may further comprise an optical zone size. The optical zone size may be received as a default value or as input from a remote or local computer or database.

According to any of the above aspects, the optical zone size may be selected based on optical and/or vision requirements. The optical zone dimensions may include 5.0, 5.5, or 6.0mm. The optical zone size may be an optical zone diameter. The optical zone may comprise a diameter of 5.5 to 12.5mm. The diameter may be 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11.1, 11.3, 11.11.3, 11.3, 11.12.12.12, 11.12.1, 11.12.12 mm, 11.12.3, 11.12.12 mm.

According to any of the above aspects, the eye shape data may further comprise: one or more vertex eye shape parameters and/or one or more values of eccentricity (E). The one or more vertex eye shape parameters may include a flat vertex radius of curvature (Ro) or a flat corneal curvature measurement and/or a steep vertex radius of curvature (Ro). The one or more eccentricity (E) values may include a flat eccentricity value and/or a steep eccentricity value. Flat eccentricity values and steep eccentricity values can be calculated on the chord. In one particular example, the eye shape data may further include a flat vertex radius of curvature or flat corneal curvature measurement, and a flat eccentricity. In another particular example, the eye shape data may further include a flat vertex radius of curvature (Ro), a steep vertex radius of curvature (Ro), a flat eccentricity (E), and a steep eccentricity (E). In another example, the eye shape data may further include an average eccentricity (E) of the normal eye shape. The average eccentricity (E) of the normal eye shape may include 0.50E.

According to any of the above aspects, the calculation may use: one or more vertex eye shape parameters and/or one or more values of eccentricity (E). The one or more vertex eye shape parameters may include a flat vertex radius of curvature (Ro) or a flat corneal curvature measurement and/or a steep vertex radius of curvature (Ro). The one or more eccentricity (E) values may include a flat eccentricity value and/or a steep eccentricity value. Flat eccentricity values and steep eccentricity values can be calculated on the chord. In one particular example, the calculation may use a flat vertex radius of curvature or flat corneal curvature measurement, as well as a flat eccentricity. In another particular example, the calculation may use a flat vertex radius of curvature (Ro), a steep vertex radius of curvature (Ro), a flat eccentricity (E), and a steep eccentricity (E). In another example, the value of the one or more eccentricities (E) may include an average eccentricity (E) of a normal eye shape. The average eccentricity (E) of the normal eye shape may include 0.50E.

In another particular example, the calculation may determine the base arc based on a flat vertex radius of curvature.

In yet another particular example, the inverted arc depth and the alignment region angle may be calculated based on eye shape data.

According to any of the above aspects, the matching surface is comprised in the vicinity of a chord where the contact lens is to rest on the eye. The vicinity may include a tangent.

The diameter of the chord may comprise 6 to 10mm, 7 to 9mm, or 7.5 to 8.5mm. The diameter of the chord may comprise 6, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0mm. In a particular example, the diameter of the chord may comprise 8.0mm.

The method of the second or third aspect may further comprise determining whether to provide the contact lens as a symmetrical contact lens or a toric contact lens. The determining may include comparing the flat meridian depth and the steep meridian vector depth in the eye shape data above the chord diameter. The determining may further include: the determination may be a toric contact lens when the difference in height between the flat meridian depth and the steep meridian depth is greater than or equal to 30 microns.

According to any of the above aspects, the contact lens may comprise a symmetrical or toric landing for a spherical or highly astigmatic eye shape.

According to any of the above aspects, the base arc may comprise a range of 5.5 to 12.5 mm.

According to any of the above aspects, the reverse arc depth may be modified in 1 micron increments.

According to any of the above aspects, the reverse arc depth may comprise a range of 0.2 to 1.0 mm.

According to any of the above aspects, the reverse arc depth may provide a vertex gap of 2 to 20 μm, 3 to 15 μm, 5 to 10 μm, or 7 μm.

According to any of the above aspects, the alignment area angle may be modified in 0.01 ° increments.

According to any of the above aspects, the alignment area angle may comprise an angle between 20 and 50 °.

According to any of the above aspects, the order may include a spectacle prescription and/or a contact lens prescription. The lens prescription may include one or more of a spherical component and a vertex component.

According to any of the above aspects, the order for corrective lenses may include a prescription (Rx).

In one example of any of the above aspects, the base arc may be calculated using or based on the delay-sen (Jessen) formula. The delay equation may further include a compression factor.

According to any of the above aspects, the tear layer depth may comprise a tear layer depth at an edge of the optical zone.

According to any of the above aspects, the alignment profile may comprise an alignment line or one or more alignment curves. The one or more alignment curves may include two alignment curves.

According to any of the above aspects, the cornea shaping contact lens may further comprise an edge profile. The edge profile may include a tri-elliptical boundary definition.

According to any of the above aspects, the cornea-shaping contact lens design may be applied to a contact lens blank or clasp or to an injection molded contact lens.

According to any of the above aspects, the contact lens may further comprise a relay zone. The relay zone may comprise a width of 0.5mm to 0.7mm, 0.55mm to 0.65mm, or 0.6mm and/or a depth of 10 μm to 20 μm, 12.5 μm to 17.5 μm, or 15 μm.

According to any of the above aspects, the contact lens comprises one or more peripheral regions. The one or more peripheral regions may be peripheral to the alignment region. The one or more peripheral regions may include two curves to create an edge lift at the peripheral cornea. The one or more peripheral regions may have a width of 0.2mm to 0.5mm, 0.3mm to 0.4mm or 0.35mm and/or a depth of 20 μm to 100 μm.

According to any of the above aspects, the at least three zones, the optical zone, the intermediate zone and the alignment zone comprise zones of the rear surface of the lens.

Further aspects and/or features of the present invention will become apparent from the detailed description that follows.

Drawings

In order that the invention may be readily understood and put into practical effect, reference will now be made to the examples of the invention, with reference to the accompanying drawings, wherein like reference numerals refer to like elements. These figures are provided by way of example only, in which:

fig. 1A: a schematic side view of a contact lens according to one example of the invention.

Fig. 1B: is a side cross-sectional view of a schematic representation of the contact lens shown in fig. 1A.

Fig. 1C: fig. 1A and 1B are bottom views of schematic diagrams of contact lenses.

Fig. 2A and 2B: an example of a computer system for use with the present invention is shown.

Fig. 3, 4, 5 and 6: a chart illustrating various methods according to examples of the present invention is shown.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the relative dimensions of some of the elements in the figures may be distorted to help improve understanding of examples of the invention.

Detailed Description

The present invention relates to contact lenses, methods of making contact lenses, methods of adjusting the dimensions of contact lenses, and contact lenses made by the methods.

In one aspect, the present invention is contemplated based, at least in part, on the unexpected discovery by the inventors, etc., that contact lenses, methods of making contact lenses, methods of adjusting the dimensions of contact lenses, and contact lenses made by the methods, may result in contact lenses comprising three or more regions being defined by at least one curve in an optical region; the depth of the middle region and the angle of the peripheral region.

In another aspect, the present invention is contemplated based, at least in part, on another unexpected discovery by the inventors, etc., that a method of adjusting the size of a contact lens and a contact lens made by the size adjustment method can be provided by adjusting lens parameters of one or more lens diameters.

The contact lenses and methods provided by the inventors and others can provide safe, healthy vision correction options without the need for eyeglasses, daytime contact or surgical risks. Unique and novel contact lens designs for shaping the cornea may allow for a wider range of patient-oriented applications. Yet another advantage provided by the present invention is that the lens can achieve faster fitting times and reduced chair time for both the eye care professional and the wearer. From children to adults, users can sleep in their way with the lenses and methods of the invention to achieve spontaneous clear vision.

Fig. 1A, 1B, and 1C illustrate different views of a schematic diagram of one example of a cornea-shaping contact lens 100 according to the present invention. Contact lens 100 includes: an optical region 120 comprising a base arc 122; a middle region 140 including a reverse arc depth (RCD) 142; and an alignment area 160 including an alignment area angle (azo) 162.

The respective areas 120, 140, 160 of the back or rear surface of the lens 100 include respective dimensions 124 (optical area dimensions), 144 (intermediate area dimensions), 164 (alignment area dimensions) that when added up are equal to the contact lens diameter 102. The optical zone size 124 may be referred to as an optical zone diameter 124.

Preferably, each region 120, 140, 160 takes a unique shape that can be designed to produce the best effect for each eye. The base curve 122 and the central optical zone 120 form the interior portion of the lens 100. The first peripheral portion of the optical zone is a middle zone 140 that includes a reverse arc depth 142 that connects the central optical zone 120 to the alignment zone 160. The third and most peripheral portion of the lens 100, the alignment area 160, includes an alignment area angle 162. As will be explained below, each region 120, 140, 160 can be highly customized as desired.

The base arc may comprise a range of 5.5 to 12.5 mm.

In other examples, the lens 100 can include other regions that can be between the optical zone 120 and the intermediate zone 140, between the intermediate zone 140 and the peripheral zone 160, or the periphery of the peripheral zone 160.

Preferably, the contact lens 100 and method 300 of the present invention select initial lens parameters and allow for a high degree of customization of each of the zones 120, 140, 160. Each lens 100 may be individually configured to provide a particular size, shape, and effect based on the patient's age, diopter, topography, and vision requirements.

Optical zone 120 is the innermost portion of contact lens 100 and serves an important role in shaping the mold and altering the refractive power of the corneal epithelium.

The base arc radius may be determined by method 300, and method 300 may include a calculation using the delay (Jessen) formula with or without additional compression factors. For example, if the order for corrective eyeglasses is-3.00 diopters (D), then the base curve of the lens may be 3.00D flatter than either flat k or Ro. Additional flattening may be added in the form of a compression factor. The compression factor may vary between 0.05D and not more than 2.50D. The optical zone 120 and base arc 122 can be ordered over a wide radius and in 0.01mm increments. In addition, the method 300 may be used to determine whether the base curve 122 should be spherical or aspherical to produce optimal results. Once the contact lens 100 is donned, more or less effect can be produced by flattening or steepening the base curve 122.

As with other corneal shaping designs, the base curve 120 creates a model or desired shape of the cornea after overnight wear. It works by changing the curvature of the cornea while the patient is sleeping, thereby reducing the ability of the myopic eye to over focus. The base arc may be calculated using or based on the delay-son formula.

Another feature of contact lens 100 is the lens design made by method 300, which can create a shape to apply the precise tear film force required for correction to each eye, prescription, and optical zone size 124. In addition, the optical zone 120 may be reduced in size to create better control of myopia in children, or enlarged in size to reduce aberrations in adults.

The optical zone may include a diameter 124 of 5.5 to 12.5mm. The diameter may be 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.1, 11.11.1, 11.11.3, 11.11.1, 11.12.12, 11.12.1, 11.12.12 mm.

The optical zone diameter 124 may be selected to produce a different power distribution for each eye. For adults, a larger optical area 120 may be employed to maximize the treatment area size and minimize aberrations. For children, a smaller optical zone 120 may be selected to reduce the size of the treatment zone that results in more peripheral add power and may produce increased spherical aberration, which has been shown to result in better myopia progression control. The ability to change the optical zone 102 may also be beneficial in achieving higher prescription changes in the cornea shaping treatment.

The reverse arc 142 is used to control the sagittal depth 106 (not shown) of the contact lens 100. The important intermediate region 140 relates the deep fluid reservoir created by the base curve 122 and the optical region 120 to the landing of the lens. The contact lens 100 allows the reverse arc depth (RCD) 142 to be varied in increments as small as 1 μm to control the apex gap 108 (not shown) and depth of the lens 100.

The reverse arc depth (RCD) 142 controls the sagittal depth 106 (not shown) of the lens 100 and the resulting vertex gap 108 (not shown). The method 300 may determine the exact reverse arc depth (RCD) 142 to create a vertex gap 108 of about 7 microns while connecting the optical zone 120 to the alignment zone 160 of the lens 100. When more apex gap 108 is desired, the reverse arc depth (RCD) 142 may be increased to increase the height of the lens 100 and create a greater center fluid thickness. Conversely, when there is too much clearance, the reverse arc depth (RCD) 142 may be reduced. A typical adjustment is to increase or decrease the reverse arc depth (RCD) 142 in 10 micron increments unless smaller or larger modifications are required. The reverse arc depth (RCD) 142 has a wide range of parameter availability and is used for tight fitting in 1 μm steps.

Preferably, the reverse arc depth (RCD) can be modified in 1 μm increments. The reverse arc depth (RCD) may comprise a range of 0.2 to 1.0 mm. In addition, the reverse arc depth (RCD) may provide a vertex gap 108 of 2 to 20 μm, 3 to 15 μm, 5 to 10 μm, or 7 μm.

The neutralization adaptation of the contact lens 100 can be controlled by an alignment area 160 and an alignment area angle (AZA) 162. The alignment area 160 may be controlled and marked according to its cone angle 166, which is the closest tangential surface to the eye shape of each individual.

Alignment area 160 facilitates landing lens 100 on the peripheral cornea and creates a centered, comfortable and healthy tear exchange. When the fit of the lens 100 is high (high rim), loose, or exhibits excessive edge lift, then the alignment area angle (AZA) 162 may be increased to tighten the overall landing of the lens 100. Conversely, when the lens 100 is low fitting, too tight, and exhibits insufficient edge lift, the alignment area angle (AZA) 162 may be reduced to mitigate landing of the lens 100. When a change in the alignment area angle (AZA) 162 is required, the usual adjustment is a one degree step size. The lens 100 allows a wide range of angles and is incrementally increased by 0.01 °.

Preferably, the alignment area angle (AZA) may be modified in 0.01 ° increments. The alignment area angle (azo) may comprise an angle between 20 and 50 °.

In addition, the contact lens 100 may use the edge profile 104 (not shown) to select to maximize tear exchange, performance, and comfort. The skilled artisan can readily select an appropriate edge profile 104 from the teachings herein and the common general knowledge in the art. The edge profile may include a tri-elliptical boundary definition.

The alignment area 160 can be used to land the lens 100 on the peripheral cornea and create a concentrated, comfortable and healthy tear exchange. When the fit of the lens 100 is too high, loose, or exhibits excessive edge lift, the alignment area angle (AZA) 162 may be increased to tighten the overall landing of the lens 100. Conversely, when the fit of the lens 100 is low, tight, and exhibits insufficient edge lift, the alignment area angle (azo) 162 may be reduced to mitigate landing of the lens 100. When it is desired to change the alignment area angle (AZA) 162, a typical adjustment is a one degree step size. The lens 100 may allow a wide range of angles and increment in 0.01 deg..

The tear layer depth may include a tear layer depth at an edge of the optical zone.

As described above, contact lens 100 is useful in both symmetric and toric landings for spherical or highly astigmatic eye shapes. Another advantage of the present invention is that the particular optical zone size 124 may be selected based on the individual's optical and/or vision requirements.

Many eyes fitted with lenses 100 may benefit from toric landing even when their corneal astigmatism shows low. The method 300 may determine when symmetry should be employed compared to a toric landing and may automatically calculate parameters. This allows for optimal peripheral alignment of the eyes, resulting in optimal centering, comfort and effect. Method 300 calculates a toric landing for an eye having a sagittal difference of 30 microns or greater in the peripheral cornea. In addition, for low, medium and highly astigmatic eye shapes, moon lenses (moolens) can be ordered in limited increments of 1 μm over a wide range of toric power.

As is apparent from the foregoing, in one example, the present invention provides a cornea-shaping contact lens 100 comprising a lens diameter 102, a posterior surface 110 and an anterior surface 112, and at least three regions. These three regions include an optical region 120 that includes an optical region dimension 124 and a back surface Base Curve (BC) 122, the optical region 120 creating a fluid reservoir that includes a base curve height determined by the tear layer depth when worn on the eye.

The other region is a middle region 140 that includes a middle region dimension 144, a rear surface reverse arc 146, and a preset reverse arc depth (RCD) 144, the rear surface reverse arc 146 being aligned with the base arc height and the middle region dimension 144 being associated with the preset reverse arc depth 144.

The third region is an alignment region 160 that includes an alignment region dimension 164 and an alignment contour 168 that contacts the eye at the contact string when worn, and an alignment region angle (AZA) 162, the alignment region angle 162 providing a matching surface that matches the shape of the eye as determined by the eye shape data of the eye on which the cornea-shaping contact lens is to be worn.

The "matching surface" may comprise a shape corresponding to the eye as determined using the eye shape data, or may be of similar form, also depending on the eye shape data. The available eye shape data may determine whether the matching surface includes a corresponding shape or similar form. In one example, the matching includes a similar form at the chord where the contact lens is to be placed. By utilizing tangent lines, the matching surface may be more flexible when high quality eye shape data is not available.

Alignment profile 168 may include an alignment line or one or more alignment curves. The one or more alignment curves may include two alignment curves.

The present invention also provides a method 300 of calculating a cornea-shaping contact lens design that can then be applied to make contact lens 100. The method 300 includes receiving 310 eye data including order and eye shape data for corrective lenses. Receiving 310 may also include receiving one or more cornea-shaping contact lens parameters including a diameter of the cornea-shaping contact lens.

The method 300 further includes calculating 320 a cornea-shaping contact lens design from the received eye data, the cornea-shaping contact lens design including the received cornea-shaping contact lens diameter and including an optical zone 120 including an optical zone dimension 124 and a posterior surface Base Curve (BC) 122, the optical zone 120 producing a fluid reservoir including a base curve height determined by a tear layer depth when worn on the eye; a middle region 140 comprising a middle region dimension 144, a rear surface reverse arc 146, and a preset reverse arc depth (RCD) 142, the rear surface reverse arc 146 being aligned with the base arc height, and the middle region dimension being related to the preset reverse arc depth; and an alignment area 160 comprising an alignment area dimension 164 and an alignment contour 168 that contacts the eye at the contact chord when worn, and an alignment area angle (AZA) 162 that provides a matching surface that matches the eye shape determined from the eye shape data.

The present invention also provides a method 400 of making a cornea-shaping contact lens 100, shown in fig. 4, comprising steps 310, 320; and the calculated cornea-shaping contact lens design is also applied 340 to the contact lens to make the cornea-shaping contact lens 100.

Another method provided by the present invention is a method 500 of adjusting the size of a contact lens for shaping the cornea. The steps of method 500 are shown in fig. 5 as including receiving 510 an initial cornea-shaping contact lens design including an initial cornea-shaping contact lens diameter, an initial optical zone dimension, an initial intermediate zone dimension, and at least one initial peripheral zone parameter, and also receiving a resized cornea-shaping contact lens diameter. The received initial cornea-shaped contact lens design may be made by the method 300 of making the lens 100.

The method 500 further includes scaling 520 at least one initial intermediate zone dimension to a resized intermediate zone dimension that integrates the difference between the initial cornea-shaping contact lens diameter and the resized cornea-shaping contact lens diameter and aligns with the initial optical zone and the peripheral zone to provide the resized cornea-shaping contact lens.

Another method provided by the present invention is a method 600 of making a resized contact lens for shaping the cornea. As shown in fig. 6, method 600 includes receiving 510 and scaling 520 at least one intermediate zone dimension after scaling applied 530 to a cornea-shaping contact lens design to produce a cornea-shaping contact lens.

In one example of the methods 500, 600, a preset reverse arc depth (RCD) may be maintained by recalculating the back surface reverse arc to align with the base arc height at the resized intermediate region size.

As will be readily appreciated by those skilled in the art, the eye data may include right eye data and left eye data, and may also include a visible iris diameter.

The eye shape data may include eye topography data and/or cornea measurement data. The ocular topography data may comprise corneal and/or scleral topography data, and the corneal measurement data may comprise one or more K-readings.

The present invention also provides a computer system and computing device, such as computer system and computing device 200 for performing any of methods 300, 400, 500, or 600. The present invention also provides computer program code means to perform any of the methods 300, 400, 500, 600 of the present invention.

The received one or more eye data, the received cornea-shaped contact lens diameter, the received initial cornea-shaped contact lens design, and the received resized shaped contact lens diameter may be received from a local or remote computer and may be received from one or more computing networks, such as networks 220, 222.

The received contact lens diameter may be received as a default value or as input from a remote or local computer or database.

The one or more cornea-shaping contact lens parameters may further comprise an optical zone size. Also, the optical zone size may be received as a default value or as input from a remote or local computer or database.

The skilled artisan can readily select the optical zone dimensions based on optical and/or visual needs in accordance with the teachings herein and the common general knowledge in the art. The optical zone dimensions may include 5.0, 5.5, or 6.0mm. The optical zone size may be an optical zone diameter. The optical zone may comprise a diameter of 5.5 to 12.5mm. The diameter may be 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11.1, 11.11.3, 11.3, 11.11.3, 11.12.12.12, 12.1, 11.12.3, 11.12.12.3, 11.12.1, 12.12.12 mm.

The eye shape data and/or calculations 320 may further include: one or more vertex eye shape parameters and/or one or more values of eccentricity (E). The one or more vertex eye shape parameters may include a flat vertex radius of curvature (Ro) or a flat corneal curvature measurement and/or a steep vertex radius of curvature (Ro). The one or more eccentricity (E) values may include a flat eccentricity value and/or a steep eccentricity value. The value of the flat eccentricity (E) and the value of the steep eccentricity (E) may be calculated on the chord. In one particular example, the eye shape data may further include a flat vertex radius of curvature or flat corneal curvature measurement, and a flat eccentricity. In another particular example, the eye shape data may further include a flat vertex radius of curvature (Ro), a steep tip radius (Ro), a flat eccentricity (E), and a steep eccentricity (E). In another example, the eye shape data may further include an average eccentricity (E) for a normal eye shape. The average eccentricity (E) for a normal eye shape may include 0.50E.

The calculation 320 may determine a base arc based on the flat vertex radius of curvature.

The inversion arc depth and the alignment region angle may be calculated based on eye shape data.

The methods 300, 400 may further include determining whether to provide the contact lens as a symmetrical contact lens or a toric contact lens. The determining may include comparing the flat meridian depth and the steep meridian vector depth in the eye shape data above the chord diameter. The determining may further include: the determination may be a toric contact lens when the difference in height between the flat meridian depth and the steep meridian depth is 30 μm or more. For spherical or highly astigmatic eye shapes, a symmetrical or toric landing can be determined.

The order may include a spectacle prescription and/or a contact lens prescription. The lens prescription may include one or more of a spherical component and a vertex component. The order for corrective lenses may include a prescription (Rx).

The cornea-shaped contact lens designs made by methods 300 and/or 500 may be applied to a contact lens blank or clasp or to an injection molded contact lens.

Although not illustrated in the figures, the cornea-shaping contact lens 100 can further include a relay zone and/or one or more peripheral zones. The relay zone may comprise a width of 0.5mm to 0.7mm, 0.55mm to 0.65mm, or 0.6mm and/or a depth of 10 μm to 20 μm, 12.5 μm to 17.5 μm, or 15 μm.

One or more peripheral regions may be located at the periphery of the alignment region and may include two curves to create an edge lift at the peripheral cornea. The width of the one or more peripheral regions may include a width of 0.2mm to 0.5mm, 0.3mm to 0.4mm or 0.35mm and/or a depth of 20 μm to 100 μm.

The lens 100 is BOSTON from Boussler (Bausch+Lomb)II breathable materials, which are approved by the FDA for use in the overnight sclera or sclera. Other suitable materials for lens 100 can be readily selected by the skilled artisan in light of the teachings herein.

Fig. 2A and 2B illustrate one example of a computing system 200 suitable for use in the present invention. In the illustrated example, the computing system 200 includes a computer module 201, the computer module 201 including input devices such as a keyboard 202, a mouse pointer device 203, a scanner 226, an external hard drive 227, and a microphone 280, and output devices including a printer 215, a display device 214, and speakers 217. In some examples, video display 214 may include a touch screen.

The modulator-demodulator (modem) transceiver device 216 may be used by the computer module 201 to communicate with the communication network 220 via connection 221. The network 220 may be a Wide Area Network (WAN), such as an Intemet, cellular telecommunications network, or a private WAN. The computer module 201 may be connected to other similar computing devices 290 or server computers 291 via the network 220. Where connection 221 is a telephone line, modem 216 may be a conventional "dial-up" modem. Alternatively, where connection 221 is a high capacity (e.g., cable) connection, modem 216 may be a broadband modem. Wireless modems may also be used to wirelessly connect with network 220.

The computer module 201 typically includes at least one processor 205, and a memory 206 formed of, for example, semiconductor Random Access Memory (RAM) and semiconductor Read Only Memory (ROM). The module 201 also includes a plurality of input/output (I/O) interfaces: an audio-video interface 207 coupled to the video display 214, speaker 217, and microphone 280; I/O interface 213 for keyboard 202, mouse 203, scanner 226, and external hard drive 227; and an interface 208 for an external modem 216 and printer 215. In some implementations, the modem 216 may be contained within the computer module 201, such as within the interface 208. The computer module 201 also has a local network interface 211 that allows coupling the computer module 201 to a local computer network 222, known as a Local Area Network (LAN), via connection 223.

Also as shown, local network 222 may also be coupled to a wide range network 220 via connection 224, which will typically include so-called "firewall" devices or devices having similar functionality. The interface 211 may be formed by an ethernet circuit card, a bluetooth wireless device, or an IEEE 802.11 wireless device, or other suitable interface.

The I/O interfaces 208 and 213 may provide either or both serial and parallel connections, the former typically being implemented in accordance with the Universal Serial Bus (USB) standard and having corresponding USB connectors (not shown).

The storage device 209 is provided and typically includes a Hard Disk Drive (HDD) 210. Other storage devices such as external HD 227, disk drives (not shown), and tape drives (not shown) may also be used. The optical disc drive 212 is typically used to function as a non-volatile data source. Portable storage devices such as compact discs (e.g., CD-ROM, DVD, blu-ray disc), USB-RAM, external hard drives, and floppy discs may be used as suitable data sources for computing device 200. At least one server computer 291 provides another source of data to the computer module 201 over the network 220.

The components 205 through 213 of the computer module 201 typically communicate via the interconnection bus 204 in a manner that causes a conventional mode of operation of the computing device 200. In the example shown in fig. 2A and 2B, the processor 205 is coupled to the system bus 204 by a connection 218. Similarly, the storage 206 and optical disk drive 212 are coupled to the system bus 204 by connection 219. Examples of computing devices 200 capable of practicing the described apparatus include: IBM-PC and compatible products, sun stark (spark) workstation, apple computer; a smart phone; a tablet computer or a device comprising a computer module, such as computer module 201, etc. It is understood that when the computer module 201 comprises a smart phone or tablet, the display device 214 may comprise a touch screen and other input and output devices such as the mouse pointer device 203, keyboard 202, scanner 226, and printer 215 may not be included.

Fig. 2B is a detailed schematic block diagram of the processor 205 and the memory 234. Storage 234 represents a logical collection of all memory modules, including memory device 209 and semiconductor storage 206, that can be accessed by computer module 201 in fig. 2A.

The method of the present invention may be implemented using the computing device 201 and/or the computer system 200, wherein the method may be implemented as one or more software applications 233 executable within the computer module 201. In particular, the steps of the method of the present invention may be implemented by instructions 231 in software executing within the computer module 201.

The software instructions 231 may be formed as one or more code modules, each for performing one or more specific tasks. The software 233 may also be divided into two separate parts, wherein a first part and corresponding code module performs the method of the invention, and a second part and corresponding code module manages the graphical user interface between the first part and the user.

The software 233 may be stored in a computer readable medium, including in the types of storage devices described herein. The software is loaded into the computer module 201 from a computer readable medium or through the network 221 or 223 and then executed by the computer module 201. In one example, the software 233 is stored on a storage medium 225 that is read by the optical disc drive 212. Software 233 is typically stored in HDD 210 or storage 206.

The computer readable medium having such software 233 or a computer program recorded thereon is a computer program product. The use of a computer program product in the computer module 201 preferably affects an apparatus or means for implementing the method of the invention.

In some cases, the software application 233 may be provided to the user encoded on one or more optical disk storage media 225, such as a CD-ROM, DVD, or Blu-ray disk, and read via the corresponding drive 212, or alternatively may be readable by the user from the network 220 or 222. Furthermore, the software can also be loaded into the computer module 201 from other computer readable media. Computer-readable storage media refers to any non-transitory tangible storage medium that provides recorded instructions and/or data to computer module 201 or computer system 200 for execution and/or processing. Examples of such storage media include floppy disks, magnetic tape, CD-ROMs, DVDs, blu-ray discs, hard disk drives, ROMs or integrated circuits, USB storage, magneto-optical discs, or computer readable cards such as PCMCIA cards, etc., whether such devices are internal or external to computer module 201. Examples of transitory or non-tangible computer readable transmission media that may also participate in providing software applications 233, instructions 231, and/or data to computer module 201 include radio or infrared transmission channels, network connections 221, 223, 334 to another computer or networking device 290, 291, and the internet or intranet, etc. that include email transmissions and information recorded on websites, etc.

The second portion of the application 233 and the corresponding code modules mentioned above may be executed to implement one or more Graphical User Interfaces (GUIs) to be rendered or presented on the display 214. Typically, by operating the keyboard 202, the mouse 203 and/or the screen 214 when comprising a touch screen, the user of the computer module 201 and/or the computer system 200 and the method of the present invention may operate the interface in a functionally applicable manner to provide control commands and/or inputs to the application associated with the GUI. Other forms of functionally applicable user interfaces may also be implemented, such as an audio interface utilizing voice prompts output via speaker 217 and user voice commands input via microphone 280. Operations including mouse clicks, screen touches, voice prompts, and/or user voice commands may be sent via the network 220 or 222.

When the computer module 201 begins to be powered, a power-on self-test (POST) program 250 may be executed. The boot self test program 250 is typically stored in the ROM 249 of the semiconductor memory 206. A hardware device such as ROM 249 is sometimes referred to as firmware. The boot self test program 250 checks the hardware within the computer module 201 to ensure proper operation, and typically checks the processor 205, the memory 234 (209, 206), and a basic input output system software (BIOS) module 251, which is also typically stored in ROM 249, for proper operation. Once the boot self-test program 250 is run successfully, the BIOS 251 activates the hard drive 210. Activation of the hard drive 210 causes the boot loader 252 residing on the hard drive 210 to be executed by the processor 205. This loads the operating system 253 into the RAM storage 206 where the operating system 253 begins to operate. The operating system 253 is a system level application executable by the processor 205 to perform various high level functions including processor management, storage management, device management, storage management, software application interfaces, and general purpose user interfaces.

The operating system 253 manages the memory 234 (209, 206) to ensure that each process or application running on the computer module 201 has sufficient execution memory without conflicting with memory allocated to another process. Furthermore, the different types of storage available in computer module 201 and/or computer system 200 must be properly used so that each process can run efficiently. Thus, the overall storage 234 is not intended to illustrate how a particular partition of storage is allocated, but rather to provide an overview of the storage accessible to the computer module 201 and how such storage is used.

The processor 205 includes a plurality of functional modules including a control unit 239, an Arithmetic Logic Unit (ALU) 240, and a local or internal storage 248 (sometimes referred to as a cache). The cache 248 typically includes a plurality of storage registers 244, 245, 246 in a register portion of the stored data 247. One or more internal buses 241 functionally interconnect these functional modules. The processor 205 also typically has one or more interfaces 242 for communicating with external devices via the system bus 204 using the connection 218. The storage 234 is coupled to the bus 204 by connection 219.

The application 233 includes a series of instructions 231 that may include conditional branch and loop instructions. Program 233 may also include data 232 used in the execution of program 233. Instructions 231 and data 232 are stored in storage locations 228, 229, 230 and 235, 236, 237, respectively. Depending on the relative sizes of instruction 231 and storage locations 228-230, particular instructions may be stored in a single storage location, as depicted by the instructions shown in storage location 230. Alternatively, the instruction may be segmented into multiple portions, each portion stored in a separate storage location, as indicated by the instruction segments shown in storage locations 228 and 229.

Typically, the processor 205 is given a set of instructions 243 that are executed therein. The processor 205 then waits for a subsequent input, and the processor 205 reacts to the subsequent input by executing another set of instructions. Each input may be provided from one or more of a plurality of sources, including data generated by one or more of the input devices 202, 203, or 214 when the touch screen is included, data received from an external source across one of the networks 220, 222, data retrieved from one of the storage devices 206, 209, or data retrieved from the storage medium 225 inserted into the respective reader 212. Execution of the instruction set may in some cases result in output of data. Execution may also involve storing data or variables to storage 234.

The disclosed configuration uses input variables 254 stored in corresponding reservoir locations 255, 256, 257, 258 in reservoir 234. The depicted configuration produces output variables 261 that are stored in corresponding memory locations 262, 263, 264, 265 in memory 234. Intermediate variables 268 may be stored in storage locations 259, 260, 266, and 267.

The register portions 244, 245, 246, arithmetic Logic Unit (ALU) 240, and control unit 239 of the processor 205 work together to perform a series of micro-operations required to perform "fetch, decode, and execute" cycles for each instruction in the instruction set comprising the program 233. Each fetch, decode, and execute cycle includes:

(a) A fetch operation that fetches or reads instructions 231 from storage locations 228, 229, 230;

(b) A decode operation in which the control unit 239 determines which instruction has been fetched; and is also provided with

(c) Operations are performed in which the control unit 239 and/or the ALU 240 execute the instruction.

Thereafter, another fetch, decode, and execute cycle may be performed for the next instruction. Similarly, a storage cycle may be performed whereby the control unit 239 stores or writes values to the storage location 232.

Each step or sub-process in the method of the present invention may be associated with one or more segments of program 233 and may be performed by registers 244-246, with ALU 240 and control unit 239 in processor 205 working together to perform fetch, decode, and execute cycles for each instruction in the instruction set of the marked segments of program 233.

As shown in fig. 2A, one or more other computers 290 may be connected to the communication network 220. Each such computer 290 may have a similar configuration as the computer module 201 and corresponding peripheral devices.

One or more other server computers 291 may be connected to the communication network 220. These server computers 291 respond to requests from the computing device 200 or other server computers to provide information.

Alternatively, the methods of the present invention may be implemented in dedicated hardware, such as one or more integrated circuits that perform the functions or sub-functions of the described methods. Such dedicated hardware may include a graphics processor, a digital signal processor, or one or more microprocessors and associated memory.

It will be appreciated that the processor and/or memory of the processing machine need not be physically located in the same geographical location in order to practice the method of the present invention as described above. That is, each of the processors and storages used in the present invention may be located in geographically disparate locations and connected to communicate in any suitable manner. In addition, it is understood that each processor and/or each storage may be comprised of different physical device elements. Thus, the processor need not be one single device element at one location, and the memory need not be another single device element at another location. That is, it is contemplated that the processor may be two device elements located in two different physical locations. The two different device components may be connected in any suitable manner. In addition, the reservoir may comprise two or more portions of the reservoir in two or more physical locations.

For further explanation, the processes described above are performed by various components and various storages. However, it will be appreciated that, according to another example of the invention, the processing performed by two different components as described above may be performed by a single component. Furthermore, the processing performed by one different component as described above may be performed by two different components. In a similar manner, according to another example of the invention, the storage performed by two different storage portions as described above may be performed by a single storage portion. Furthermore, the storage of the memory performed by one different memory section as described above may be performed by two memory sections.

Furthermore, various techniques may be used to provide communication between various processors and/or memories, as well as to allow the processors and/or memories of the present invention to communicate with any other entity, i.e., as an example, to obtain further instructions or access and use remote memory storage. These techniques for providing such communication may include, for example, a network, the Internet, an intranet, an extranet, a Local Area Network (LAN), an Ethernet, a telecommunications network (e.g., a cellular or wireless network), or any client server system providing communication. Such communication techniques may use any suitable protocol, such as TCP/IP, UDP, or OSI.

The following non-limiting examples illustrate the invention. These examples should not be construed as limiting: these examples are included for illustrative purposes only. The embodiments will be understood to represent examples of the present invention.

Examples

Example 1

The methods 300, 400 have been implemented as an online calculator in which a practitioner has an accessible and easy-to-use online tool to construct their customized contact lens 100 parameters. Default diameter 102 is 10.6mm, but may be adjusted for smaller or larger eyes. An Optical Zone (OZ) 120 is then selected based on the age of the patient and the order for corrective lenses. The vertex spherical component of the order for corrective lenses, and the vertex radius of curvature and decentration values for the flat and steep meridians are entered. Using this information, the software implemented method 300 will determine if a symmetric or toric lens 100 is required and automatically calculate various zone parameters. See table 1 below.

Table 1: embodiments of data as an on-line calculator

	Right eye (OD)	Left eye (OS)
			Diameter of	10.6	10.6
OZ(5.0；5.5；6.0)	6.0	6.0
			Order for corrective lenses	-3.00	-3.00
Radius of curvature of flat vertex	7.80	7.80
			Flat eccentricity	0.50	0.50
Radius of curvature of steep apex	7.75	7.60
			Steep eccentricity	0.4	0.3

The automatic calculator uses the method 200 to determine the exact base arc 122, inverted arc depth 142 or RCD, and alignment area angle 162 or azo required for each eye. In this embodiment, the software implemented method 200 has determined that the right eye should adapt to the symmetric lens 100, while the left eye has a peripheral toricity high enough to ensure toric landing. Using this information, the laboratory is able to construct a highly customized lens 100 for each eye. See table 2.

Table 2: as an example of online computing:

	right eye (OD)	Left eye (OS)
			Design file	Symmetrical lens 100	Toric lens
Base arc	8.49	8.49
			Diameter of	10.6	10.6
Basic Optical Zone Diameter (BOZD)	6.0	6.0
			Reverse arc depth (RCD)	0.531	0.531
Alignment area angle (AZA)	32.3	32.3
			Steep reversal arc depth		0.567
Steep alignment area angle		34.12
			Design of	Symmetrical with each other	Toric surface

Example 2

To fit the lens, the first step is to evaluate candidate qualification, suggesting near-5.00D or less; refractive astigmatism is-1.50D or less, and the ocular surface is free of inflammation, infection, or swelling.

The next step is a pre-operative examination of the cornea, comprising: refraction; checking a slit lamp; corneal curvature measurement readings; corneal topography; and assessment and quantification of cornea diameter (visible iris diameter).

The third step is data collection, comprising: refractive data; vertex radius of curvature data (or K readings); eccentricity is recommended but is only optional; and quantifying the diameter of the visible iris.

Again, the methods 300, 400 were implemented as an online calculator, loaded and the desired optical zone size (5.0, 5.5, or 6.0 mm) was selected (see table 3).

An order for corrective lenses may then be entered, or otherwise provided. Spherical components and vertices of the order for corrective lenses may be used if desired. The flat vertex radius of curvature (Ro) may also be input, or otherwise provided. If this value is not available, a planar corneal curvature measurement reading is selected. The flat eccentricity (E) can also be input into the corneal topographer and the values analyzed on an 8mm chord. If a toric lens 100 is desired, a steep and flat vertex radius of curvature (steep and flat Ro) and a steep and flat eccentricity (steep and flat E) may be entered. If these inputs are left blank, a symmetrical lens 100 will be calculated. The lenses 100 may then be ordered.

Table 3: optical zone selection table:

the next step in the online calculator is to apply the method 400 to provide the contact lens 100.

The order magnitude and pupil size for corrective eyeglass lenses may be considered when determining the appropriate optical zone 120 based on age (myopia management for child or adult cornea shaping).

The spherical component of the patient for correcting the order for the eyeglass lenses may be entered or otherwise provided. The vertex degree is-4.00D and above. When astigmatism is present, spherical lens values are not recommended.

Flat vertex radius of curvature: many topographers provide a flat vertex radius of curvature value or flat Ro. This reading is used as the best lens 100 result, if possible. However, if the vertex curvature radius value is not available, a flat corneal curvature measurement reading is used.

Flat eccentricity: most topographers will provide eccentricity of the main meridian. This is a measure of the rate of corneal applanation of the eye from center to periphery. The online calculator implements the method 300 to use this value to determine the desired contact lens height. If possible, the eccentricity on an 8mm chord is calculated. If the eccentricity is not available, the calculator defaults to 0.50e, the average of the normal eye shape.

Steep vertex radius of curvature: when a toric lens 100 is desired, a steep and flat radius of curvature of the apex or steep Ro is entered or otherwise provided. If these values are not available, the reading is measured using steep and flat corneal curvature.

Steep eccentricity: when a toric lens 100 is desired, the steep meridional eccentricity calculated on an 8mm chord is entered.

Table 4 shows data for right eye (OD) advice indicating the requirements for the 6.0mm optical zone 120 and an order for corrective eyeglass lenses of-3.00D. The "flat vertex radius of curvature" and "flat eccentricity" have been entered, which will result in a symmetrical lens 100. By comparison for the left eye (OS), both the flat and steep regions already have input data that will result in a toric lens 100.

Table 4: embodiments of data as an on-line calculator

The results in this embodiment shown in table 5 provide parameters for ordering the lens 100. The command for correcting the lens will determine the base curve 122 along with the entered flat vertex radius of curvature. Based on the input cornea shape data, the reverse arc depth 142 and the alignment region angle 162 are calculated for each eye, respectively. The method 300 will calculate a symmetrical or toric surface based on the input corneal shape data.

Table 5: as an example of online computing:

	OD	OS
			patient prescription	-3.00	-3.00
Base arc	8.5	8.5
			Reverse arc depth (RCD)	0.54	0.52
Alignment area angle (AZA)	32	32
			Steep reversal arc depth		0.54
Steep alignment area angle		0.32
			Design of	Symmetrical with each other	Toric surface

Preferably, the present invention provides more customization of each individual patient's eye than conventional cornea-shaping contact lenses. This multiple customization enables personalization of the lens diameter for improved sagittal depth 106 and personalization of the alignment curve to provide better stability, neutrality and comfort.

The lenses and methods of the invention may achieve myopia correction up to-5.00 and astigmatism correction up to 1.50.

The contact lens is designed for successful first adaptation and is characterized by micro-customization with a step size of one micron.

Another benefit of the present invention is that the online calculator provides an efficient determination of the necessary parameters.

Another benefit with respect to the sizing provided by the present invention is the ability to make trial adaptations with one contact lens diameter and custom adaptations with another contact lens diameter without adjusting any other parameters.

In this specification, the terms "comprises," "comprising," or the like are intended to mean a non-exclusive inclusion, such that a device that comprises a list of elements does not include only those elements but may include other elements not listed.

Throughout this specification, the aim has been to describe the invention without limiting the invention to any one particular example or specific collection of features. One skilled in the relevant art will recognize variations from the specific examples that would still fall within the scope of the invention.

Claims

1. A contact lens for shaping a cornea, comprising:

contact lens diameter, posterior and anterior surfaces, and at least three regions:

an optical zone comprising an optical zone size and a front-back surface base curve, the optical zone producing a fluid reservoir comprising a base curve height determined by a tear layer depth when worn on an eye;

a middle region comprising a middle region size, a front-to-back surface reversal arc and a preset reversal arc depth, the front-to-back surface reversal arc being aligned with the base arc height, and the middle region size being related to the preset reversal arc depth; and

an alignment area comprising an alignment area size and an alignment contour that contacts the eye at a contact chord when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from eye shape data of an eye to which the cornea-shaping contact lens is to be worn.

2. The cornea shaping contact lens of claim 1, wherein the eye shape data further comprises: one or more vertex eye shape parameters and/or one or more values of eccentricity.

3. A method of calculating a cornea-shaping contact lens design, the method comprising:

Receiving eye data including order and eye shape data for corrective lenses;

receiving one or more cornea-shaping contact lens parameters comprising a cornea-shaping contact lens diameter;

calculating a cornea-shaping contact lens design from the received eye data, the cornea-shaping contact lens design comprising the received cornea-shaping contact lens diameter and comprising:

an alignment area comprising an alignment area size and an alignment contour that contacts the eye at a contact chord when worn, and an alignment area angle that provides a matching surface that matches the eye shape, the eye shape determined from the eye shape data.

4. A method as claimed in claim 3, wherein the method is performed using a computer system.

5. A method as claimed in claim 3, wherein the method is performed using computer program code components.

6. The method of claim 3, wherein the eye shape data further comprises: one or more vertex eye shape parameters and/or one or more values of eccentricity.

7. A method as claimed in claim 3, wherein the calculation uses: one or more vertex eye shape parameters and/or one or more values of eccentricity.

8. A method as claimed in claim 3, wherein the calculation determines the base arc based on a flat vertex radius of curvature.

9. A method as claimed in claim 3, wherein the inverted arc depth and the alignment region angle are calculated based on the eye shape data.

10. The method of claim 3, further comprising determining whether to provide the cornea-shaping contact lens as a symmetric contact lens or a toric contact lens, wherein the determining comprises comparing a flat meridian depth and a steep meridian vector depth in eye shape data above a chord diameter.

11. A method of making a cornea-shaping contact lens, the method comprising:

receiving an order comprising eye data for correcting the lens and the eye shape data;

an optical zone comprising an optical zone size and a posterior surface base curve, the optical zone producing a fluid reservoir comprising a base curve height determined by a tear layer depth when worn on an eye;

a middle region comprising a middle region size, a rear surface reversal arc and a preset reversal arc depth, the rear surface reversal arc being aligned with the base arc height, and the middle region size being related to the preset reversal arc depth; and

an alignment area comprising an alignment area size and an alignment contour that contacts the eye at a contact chord when worn, and an alignment area angle that provides a matching surface that matches an eye shape determined from the eye shape data; and is also provided with

The calculated corneal shaping contact lens design is applied to a contact lens to make a corneal shaping contact lens.

12. The method of claim 11, wherein the eye shape data further comprises: one or more vertex eye shape parameters and/or one or more values of eccentricity.

13. The method of claim 11, wherein the calculating may use: one or more vertex eye shape parameters and/or one or more values of eccentricity.

14. The method of claim 11, wherein the calculating determines the base arc based on a flat vertex radius of curvature.

15. The method of claim 11, wherein the inverted arc depth and the alignment region angle are calculated based on the eye shape data.

16. The method of claim 11, further comprising determining whether to provide the contact lens as a symmetric contact lens or a toric contact lens, wherein the determining comprises comparing a flat meridian depth and a steep meridian vector depth in eye shape data above a chord diameter.

17. A method of adjusting the size of a cornea-shaping contact lens, the method comprising:

receiving an initial cornea-shaping contact lens design comprising an initial cornea-shaping contact lens diameter, an initial optical zone size, an initial intermediate zone size, and at least one initial peripheral zone parameter, and further receiving a resized cornea-shaping contact lens diameter; and is also provided with

Scaling at least one of the initial intermediate zone dimensions to a resized intermediate zone dimension that integrates the difference between the initial cornea-shaping contact lens diameter and the resized cornea-shaping contact lens diameter and aligns with the initial optical zone and the peripheral zone to provide a resized cornea-shaping contact lens.

18. A method of making a resized contact lens, the method comprising:

receiving an initial cornea-shaping contact lens design comprising an initial cornea-shaping contact lens diameter, an initial optical zone size, an initial intermediate zone size, and at least one peripheral zone parameter, and further receiving a resized cornea-shaping contact lens diameter;

scaling at least one intermediate zone dimension to a resized intermediate zone dimension to integrate a difference between the initial cornea-shaping contact lens diameter and the resized cornea-shaping contact lens diameter, and aligning with the initial optical zone and the initial peripheral zone to provide a resized cornea-shaping contact lens; and is also provided with

Applying the scaled at least one of the intermediate zone dimensions to a cornea shaping contact lens design to produce the cornea shaping contact lens.