WO2010025708A1 - Lentille de contact - Google Patents

Lentille de contact Download PDF

Info

Publication number
WO2010025708A1
WO2010025708A1 PCT/DE2009/001212 DE2009001212W WO2010025708A1 WO 2010025708 A1 WO2010025708 A1 WO 2010025708A1 DE 2009001212 W DE2009001212 W DE 2009001212W WO 2010025708 A1 WO2010025708 A1 WO 2010025708A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
eye
contact lens
lens part
hardness
Prior art date
Application number
PCT/DE2009/001212
Other languages
German (de)
English (en)
Inventor
Ralf Zürcher
Original Assignee
Zuercher Ralf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zuercher Ralf filed Critical Zuercher Ralf
Publication of WO2010025708A1 publication Critical patent/WO2010025708A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/049—Contact lenses having special fitting or structural features achieved by special materials or material structures
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/02—Mislocation tolerant lenses or lens systems
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
    • G02C2202/16—Laminated or compound lenses

Definitions

  • the invention relates to a contact lens according to the preamble of claim 1.
  • the "soft contact lenses” are made of a soft, non-dimensionally stable material that takes into account the required design principles in the design. Diopter power (due to ametropia) and radius of the ocular surface as well as regular astigmatism (due to regular deformations) on the surface during the adaptation of the contact lens as well as production are considered.
  • the production of the soft contact lenses is based on the aforementioned parameters as well as on the possible selection of materials and variable design zones. Depending on the manufacturer, there are different types of production.
  • the design of the soft contact lenses includes the most common and possible deformations of the eye according to the aforementioned criteria and uniform deformations of the eye. Due to the soft design of the soft contact lenses, however, it is always the case that the contact lens bears when worn on the surface of the eye directly. The contact lens adapts to the eye. Thus, their surface is parallel to the surface of the eye. Only a thickness reinforcement or thickness weakening compensates for radius and ametropia. Irregularities that would require an individual adaptation of the lens shape to the eye are not possible here.
  • the “hard contact lenses” are dimensionally stable contact lenses. They have a different function than the soft contact lenses.
  • the hard contact lenses are made of materials that allow deformation of the lenses only in a small expansion range. Their shape remains stable. They are made of hard plastics. These hard contact lenses are adapted according to the possible measuring methods on the eye and also individually manufactured and manufactured in Einzelanpassungshabilit. That's how eye radii become and dioptric values and other common presbyopia and geometry values are taken into account during fitting.
  • the hard contact lens has over the soft contact lens the advantage that it can also compensate for irregularities of the surface of the eye, but only to a limited extent. Thus, it can compensate for the soft contact lens also certain irregularities and irregular astigmatisms of the eye. The compensation takes place here over the lying between the contact lens and the eye tear film.
  • the disadvantage of the hard contact lens is compared to the soft contact lens in the lack of spontaneous compatibility. Furthermore, the hard contact lens can move on the eye and is therefore more noticeable to the patient than a soft contact lens. Thus, wearing hard contact lenses for the - as stated - spontaneous and for the temporary use is not comfortable and recommended. A good compatibility is only after a period of familiarization and consistent duration.
  • the invention is based on the invention to provide a contact lens, which combines the advantages of hard and soft contact lenses, and which avoids the disadvantages of the hard and soft contact lenses.
  • the contact lens according to the invention proposes the combination of a soft contact lens with a hard contact lens in such a way that this contact lens thus created combines the advantages of hard and soft contact lenses, but avoids the disadvantages of hard and soft contact lenses.
  • the technical realization is to incorporate a harder lens part in the softer lens part as an improvement of the surface structure and for stabilization during displacements of the contact lens. It is thus created a two-layer lens.
  • an optimal lens made of the soft plastic material and an optimal lens made of the hard plastic material.
  • the eye-facing lens part of the contact lens of the soft plastic material as it is known from the soft contact lenses ago and in use, it rests on the eye and allows the compensation of optical errors.
  • the Shore A hardnesses of 10-90 known from the soft contact lenses can be used.
  • the soft lens part brings at the same time the advantages of the wearing comfort of soft lenses.
  • the surface of the first lens part which thus rests directly on the cornea of the eye and consists of a softer material, is formed in such a way that that in this soft lens material of a consistency more stable lens is incorporated.
  • This outer hard shell of the harder lens part serves the optimum surface structure at the front lens section. It ' creates the perfect surface to compensate for low vision and at the same time helps to stabilize the contact lens in general, especially during movement.
  • the outside second lens part which is incorporated in the first lens part, is intended to prevent irregularities in the surface of the cornea from being transmitted to the lens surface, both during normal contact lens contact with the eye and during movement of the lens on the lens surface Eye.
  • the second, harder lens part stabilizes the first, softer lens part basically on the eye, since the latter has incorporated the base radii of the eye and thus the contact lens always strives to position itself in the correct position on the eye.
  • the first, softer lens part eliminates through the special adjustment and the additional stabilizing upper, second, harder Lens part the previous defects.
  • the second, harder upper lens improves the location of the known soft contact lenses and the contrast vision. This is done by avoiding the rotation of the first, softer lens part on the eye to improve the contrast of the more stable surface of the second, harder lens part.
  • this refers to the usual measuring methods for determining the hardnesses which are suitable for these materials. The measuring methods themselves are then identical for the different materials, so that direct comparisons are possible. It is therefore not primarily the absolute hardness measurements, but the relative differences in the hardness of the materials, i
  • the development according to claim 2 proposes that the hard lens part is fixed in a recess of the soft lens part. As a result, a homogeneous surface in the region of the outside of the contact lens is created.
  • the development according to claim 3 proposes a first variant for fixing the hard lens part on the soft lens part.
  • the basic idea is to provide the soft lens part in the region of the recess with an undercut, in which the hard lens part is held in a form-fitting manner.
  • the hard lens part is glued to the soft lens part.
  • the plastic material of the first lens part has a lower hardness than the hardness of the cornea of the eye
  • the plastic material of the second lens part has an equal or greater hardness than the hardness of the cornea.
  • the hardness or stability of the second lens part is equal to or higher than the natural hardness or stability of the cornea of the human eye.
  • any asperities of the cornea do not press through the entire contact lens, so through the first, softer lens part through to the second, harder lens part.
  • the outer surface of the first, softer lens part is stabilized by the adjacent second, harder lens part.
  • the hardness of the plastic material of the second lens part slightly harder than the hardness of the cornea of the eye.
  • the second, hard lens part is not nearly as hard as the known and usual hard contact lenses. These usually have a Shore D hardness of 70-90.
  • the Shore hardness of the plastic material of the second, hard lens part up to 30%, in particular up to 10% greater than the Shore hardness of the cornea of the eye.
  • the wearing comfort of the first, softer lens part is not significantly affected, on the other hand, the stability of the overall contact lens is significantly increased.
  • the development according to claim 8 proposes that the hardness of the plastic material of the second, harder lens part is equal to or less than the Shore D hardness 70. This means that the second, harder lens part in any case "softer" than those of today known hard contact lenses.
  • an individual contact lens is created to a certain extent as a tailored suit which avoids or at least reduces visual defects with small displacements of the contact lens on the eye. It is a contact lens for the correction of irregular refractive errors, which corresponds to the single eye defect and which compensates for the individual topographical and / or aberrometric characteristic of each individual eye.
  • the cornea of the eye is viewed individually as a fingerprint of a human.
  • This individual contact lens is used for better comfort, better visibility and for wearing soft contact lenses (with attached semi-hard contact lens) with a short wearing time.
  • eye deficiencies that were previously uncorrectable, such as abberromatic vision defects can be corrected by customization.
  • the contact lenses can be manufactured individually for each individual, individual eye using known production techniques and contact lens types. In extreme cases, not only the vision-impaired, but also those with normal vision can achieve better vision. Especially with regard to certain activities, this variant of the visual enhancement can represent a gain for the individual patient.
  • refractive errors that have arisen due to operations on the eye can be corrected by the contact lens according to the invention.
  • the correction of surface defects is possible for the first time. This would allow such soft lenses to be worn in irregular astigmatisms and other corneal defects.
  • For patients who wear contact lenses only for certain periods of time for example, at night or in twilight weakness as a result of corneal irregularities
  • the correction of higher irregular corneal defects by taking into account the individual errors is possible and makes it possible to overcome previously not compensated by visual aids compensable visual defects.
  • the special feature of the contact lens is thus the possibility of individual adaptation to irregular surfaces and / or the possibility of compensating for aberrometric refractive errors.
  • the irregularities and aberrometric errors of each single eye with known production techniques can be customized by appropriate contact lens fabrication adapted and corrected.
  • the interaction between contact surface contact lens / eye and surface of the contact lens can compensate for any errors as best as possible, taking into account any displacement values and interpolations of strong corneal irregularities. It is thus possible, according to known production methods, to produce a standard contact lens made of a soft contact lens with a semi-hard contact lens placed thereon, which takes into account all refractive errors of the eye in connection with irregularities and aberrometric errors.
  • the requirements of surface smoothness and the definition of contact lens materials need not be redefined, but can be used from known experience in the manufacture of the contact lenses.
  • a topographic image of the eye is created before the production of the soft lens part.
  • This topographic image forms a data set which serves as the basis for the modeling of the lens surface facing the eye. This is done in such a way that the swelling behavior of the hydrated lens is taken into account and thus the irregularities are maximally compensated as far as possible.
  • the tear film serves to compensate for the irregularities.
  • the basic idea is to incorporate into the specially made first lens part the above-described second, hard lens part.
  • smoothing interpolations are made in abrupt contour changes on the inside of the contact lens.
  • smoothing interpolations are undertaken on the inside of the contact lens.
  • it is thereby possible to improve the function of very irregularly extending corneal surfaces with very sudden increases and depressions by optimizing the corneal topography to be incorporated into the contact lens by a kind of interpolation of the highs and lows. This serves to avoid or at least reduce vision defects with the slightest displacements of the contact lens on the eye.
  • an optimized inner contour of the contact lens can be calculated and thus abrupt heights and shape errors can be smoothly compensated for by interpolation of the height and depth values or, for example, extended viewing zones of the contact lens when the lens is displaced when worn.
  • the eyelid beat a shift of the contact lens down by incorporated in the upper portion of the contact lens in the displacement range visual correction a much improved vision in natural eyelid shocks or eye movements are possible. This applies equally to eye movements in other directions.
  • a conventional standard lens of the desired production type which is known in outer and geometrical dimensions, would be placed on the patient's cornea in order to determine the patient-typical positional characteristics of the commercially available standard lens.
  • the measurement of the corneal surface would be carried out using standard measuring methods on the market, namely with topographical and abberrometric as well as possibly further measuring methods.
  • the displacement values of the contact lens can be measured.
  • the shift values of contact lenses and the individual wearing values in the range of heights and depths of the single eye to be interpolated could be taken into account for the visual enhancement.
  • the irregularities are smoothed by interpolation of the highs and lows.
  • refractive errors that have arisen due to operations on the eye such as scars or deformations on the surface of the cornea
  • these interpolations take place only in regions, namely where extreme roughening is present in the surface of the cornea. "Normal" irregularities are not interpolated.
  • the development according to claim 12 proposes that the contact lens abberrometwitz errors of the eye into account.
  • the development according to claim 13 proposes that the second lens part is equipped with a UV filter. This can be easy on. Way the eye can be shielded from UV radiation.
  • Fig. 1 is a view of the contact lens
  • Fig. 2 is a section through the contact lens when worn on the eye
  • FIG. 3 shows a detail view through an eye with attached contact lens with compensating interpolations due to extreme corneal irregularities.
  • the contact lens 1 consists of two lens parts 2, 3, namely a soft lens part 2 and a hard lens part. 3
  • the soft lens part 2 made of a soft plastic material rests directly on the eye 4 and thereby adapts to the surface contour of the eye 4 (as known from soft contact lenses).
  • the outside of the soft lens part 2 has a recess 5. This has on the peripheral edge side a pocket 6. In this pocket 5, the hard lens part 3 is inserted and held by the lip of the pocket 6 positively.
  • the soft lens part 2 is - as shown - on the eye and allows the compensation of optical errors. At the same time brings the soft lens part 2, the benefits of wearing soft contact lenses with it.
  • the hard lens part 3 provides the perfect surface structure at the front lens portion to compensate for the visual impairment. At the same time it serves to stabilize the contact lens. 1
  • Fig. 3 shows a sectional view through bin eye with attached contact lens.
  • the surface of the eye 4 is characterized by a kind of strong roughening with strong ups and downs alternately.
  • an adjustment of the inner surface of the contact lens 1, namely on the soft lens part 2 is made by a computational interpolation, so as to compensate, so that little or no visual fluctuations occur with slight movements of the contact lens 1 on the eye 4.
  • the space between the surface of the eye 4 and the inner surface of the contact lens 1 is equalized by tear fluid.
  • the Shore A hardness relates to the hardness of soft elastomers
  • the Shore D hardness relates to the hardness of tough elastomers.

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

Une lentille de contact (1) comprend deux parties de lentille (2, 3). Selon l'invention, la première partie de lentille (2) repose directement sur l'œil (4) et est composée d'un matériau souple. La partie de lentille (3) composée d'un matériau relativement dur se trouve dans un évidement (5) côté avant de la partie de lentille (2) souple.
PCT/DE2009/001212 2008-09-05 2009-08-28 Lentille de contact WO2010025708A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008046140.7 2008-09-05
DE200810046140 DE102008046140B4 (de) 2008-09-05 2008-09-05 Kontaktlinse

Publications (1)

Publication Number Publication Date
WO2010025708A1 true WO2010025708A1 (fr) 2010-03-11

Family

ID=41343465

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2009/001212 WO2010025708A1 (fr) 2008-09-05 2009-08-28 Lentille de contact

Country Status (2)

Country Link
DE (1) DE102008046140B4 (fr)
WO (1) WO2010025708A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10167387B2 (en) 2013-09-10 2019-01-01 Colorado State University Research Foundation Synthetic polymeric materials and devices thereof
WO2024180470A1 (fr) * 2023-02-28 2024-09-06 Alcon Inc. Conception de bord d'insert de lentille de contact pour performance optimale

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1045065A (en) * 1964-08-05 1966-10-05 John Trevor De Carle Improvements in or relating to contact lenses
US4944584A (en) * 1986-06-14 1990-07-31 Nippon Sheet Glass Co., Ltd. Plastic multifocal point spherical lens
WO1997010527A1 (fr) * 1995-09-14 1997-03-20 The Regents Of The University Of California Optiques et lentilles ophtalmiques a indices structures pour corriger la vue
US20050105045A1 (en) * 2003-11-14 2005-05-19 Jerome Legerton Contact lens
US20070291224A1 (en) * 2006-06-15 2007-12-20 Lai Shui T High Visual Acuity Contact Lenses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2129042A1 (de) * 1971-06-11 1972-12-21 Hemr Wohlk Institut fur Contact Linsen, 2301 Schonkirchen Kontaktlinse
DE102007026313A1 (de) * 2007-06-06 2008-12-11 Zürcher, Ralf Kontaktlinse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1045065A (en) * 1964-08-05 1966-10-05 John Trevor De Carle Improvements in or relating to contact lenses
US4944584A (en) * 1986-06-14 1990-07-31 Nippon Sheet Glass Co., Ltd. Plastic multifocal point spherical lens
WO1997010527A1 (fr) * 1995-09-14 1997-03-20 The Regents Of The University Of California Optiques et lentilles ophtalmiques a indices structures pour corriger la vue
US20050105045A1 (en) * 2003-11-14 2005-05-19 Jerome Legerton Contact lens
US20070291224A1 (en) * 2006-06-15 2007-12-20 Lai Shui T High Visual Acuity Contact Lenses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10167387B2 (en) 2013-09-10 2019-01-01 Colorado State University Research Foundation Synthetic polymeric materials and devices thereof
US10626267B2 (en) 2013-09-10 2020-04-21 Colorado State University Research Foundation Synthetic polymeric materials and devices thereof
WO2024180470A1 (fr) * 2023-02-28 2024-09-06 Alcon Inc. Conception de bord d'insert de lentille de contact pour performance optimale

Also Published As

Publication number Publication date
DE102008046140A1 (de) 2010-03-18
DE102008046140B4 (de) 2010-11-18

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