JP2013015345A - Intraocular lens inspection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intraocular lens inspection apparatus which is capable of appropriately confirming the state of generating glare that may be generated when an intraocular lens is implanted in an eye.SOLUTION: An intraocular lens inspection apparatus which measures optical characteristics of an intraocular lens comprises a model eye unit, a light source unit and a turning mechanism. The model eye unit includes a cornea model lens having a curved surface matched to a cornea curvature of a human eye, a screen having a curved surface matched to a retina curvature, and an attaching/detaching part provided between the cornea model lens and the screen for removably installing the intraocular lens at a position corresponding to a distance from the cornea of the human eye to a crystalline lens with respect to the cornea model lens. The light source unit is provided for irradiating the model eye unit with light flux having a predetermined spread. The turning mechanism is provided for turning at least one of the model eye unit and the light source unit in order to change an incident angle of an optical axis center of the light flux to the cornea model lens.

Description

  The present invention relates to an intraocular lens inspection apparatus for inspecting an intraocular lens implanted in the eye.

  Intraocular lenses are used to correct vision after lens removal by cataract surgery. The intraocular lens is composed of an optical part having refractive power and a pair of support parts that support the optical part in the eye, and is inserted into the eye through an incision provided in the eye of the subject. Moreover, in order to make the incision as small as possible, the intraocular lens is formed of a material having flexibility that can be bent and elasticity that can be restored to the original state.

  By the way, when the light beam is incident on the peripheral end portion (edge portion) of the optical unit from an oblique direction with the intraocular lens installed in the eye, glare due to reflection of incident light by the edge portion ( (Glare) may occur. For example, at night when the pupil is wide open, incident light is likely to be incident on the edge portion from an oblique direction, so that glare is likely to occur. When glare occurs, the patient feels uncomfortable due to unnecessary glare. Therefore, various anti-glare measures have been studied, such as changing the reflection direction of incident light by forming a plurality of grooves in the edge portion of the intraocular lens (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 6-189986

  In addition, in order to develop and manufacture an intraocular lens in which the occurrence of glare is suitably suppressed, an inspection apparatus capable of suitably inspecting the occurrence state of glare on the assumption that the intraocular lens is mounted in the eye. It has been demanded.

  In view of the above-described problems of the prior art, it is an object of the present invention to provide an intraocular lens inspection apparatus that can suitably check the state of occurrence of glare that occurs when an intraocular lens is implanted in the eye.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) An intraocular lens inspection apparatus for measuring optical characteristics of an intraocular lens, comprising: a corneal model lens having a curved surface matched to a corneal curvature of a human eye; and a screen having a curved surface matched to a retinal curvature, A detachable portion provided between the corneal model lens and the screen, wherein the intraocular lens is detachably installed at a position corresponding to a distance from the cornea of the human eye to the crystalline lens with respect to the corneal model lens. And a light source unit for irradiating the model eye unit with a light beam having a predetermined spread, and changing an incident angle of the optical axis center of the light beam with respect to the corneal model lens Therefore, a rotation mechanism for rotating at least one of the model eye unit and the light source unit is provided.
(2) In the intraocular lens inspection apparatus according to (1), the projected pattern of the light beam projected onto the screen via the corneal model lens and the intraocular lens installed in the attachment / detachment unit is arranged on the rear side of the screen. A photographing unit for photographing from the above is provided.
(3) In the intraocular lens inspection apparatus according to (2), the model eye unit is a casing capable of storing a liquid having a predetermined refractive index in a space between the corneal model lens and the screen. And
(4) The intraocular lens inspection apparatus according to (3) includes a monitor for displaying a photographed image photographed by the photographing unit.
(5) In the intraocular lens inspection apparatus according to (4), based on a glare detection means for detecting the glare by performing image processing on a photographed image photographed by the photographing unit, and a detection result by the glare detection means Intraocular lens determination means for determining the quality of the intraocular lens.
(6) In the intraocular lens inspection apparatus according to any one of (1) to (5), the rotation shaft of the rotation mechanism is necessary for the model eye unit or the light source unit to perform a glare inspection. The optical system is characterized in that the optical axis center of the light beam is provided at a predetermined position on the model eye unit so as to pass through the corneal model lens when rotated within a predetermined angle range.
(7) In the intraocular lens inspection apparatus according to (6), the rotation axis passes through an axial center of the corneal model lens.
(8) In the intraocular lens inspection apparatus according to any one of (1) to (7), the light beam is a spherical wave, a plane wave, or an arbitrarily shaped diffused light.

  ADVANTAGE OF THE INVENTION According to this invention, the inspection apparatus of the intraocular lens which can confirm suitably the generation | occurrence | production state of the glare produced when the intraocular lens is implanted in the eye can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory diagram of an intraocular lens inspection apparatus 1. The intraocular lens inspection apparatus 1 includes a model eye unit 100 for reproducing a state where the intraocular lens 10 is installed on a human eye, and a light source unit 200 for irradiating the model eye unit 100 with a light beam having a predetermined spread. A photographing unit 300 for photographing the occurrence state of edge glare (hereinafter referred to as glare) from the image projected on the model eye unit 100.

FIG. 2 shows an explanatory diagram of the internal configuration of the model eye unit 100. FIG. 2 shows an enlarged cross-sectional view of the model eye unit 100 as viewed by cutting a cross section horizontal to the optical axis (a cross section horizontal to the optical axis passing through the axis center of the cornea model lens 110). Yes.
The model eye unit 100 includes a box-shaped housing 101 with an opening 105 formed in the upper portion, a corneal model lens 110 that simulates the cornea of a human eye, and a retina screen 120 that simulates the retina of a human eye (hereinafter simply referred to as “retina screen”). (Abbreviated as a screen), an iris (simulated iris) 130 simulating the iris of the eye, and an intraocular lens holding part 140 which is an attaching / detaching part for detachably holding the intraocular lens 10 in the housing 101. It is configured.

  A through-hole (not shown) for allowing the light beam emitted from the light source unit 200 to pass through is formed in the housing 101 in the front-rear direction, and the corneal model lens is formed in the through-hole on the side facing the light source unit 200. 110 is attached, and the screen 120 is attached to the through hole on the side facing the photographing unit 300 side. The length of the casing 101 in the optical axis direction is determined so that the distance between the corneal model lens 110 and the screen 120 is substantially equal to the axial length of the human eye. A plurality of slide mechanisms (not shown) for detachably attaching the diaphragm unit 130 and the intraocular lens holding unit 140 are provided inside (inner side) of the housing 101. The slide mechanism is formed so that the attachment position of the diaphragm 130 corresponds to the position corresponding to the distance from the cornea of the human eye to the iris, and the attachment position of the intraocular lens holding part 140 is from the cornea of the human eye to the crystalline lens. It is formed according to the position corresponding to the distance up to.

  The corneal model lens 110 is made of a transparent material such as glass or resin and has a curved surface that matches the curvature of the cornea of the human eye (such as the average value of the curvature of the cornea). Further, the screen 120 may be any material that can be used as a screen and has a light-transmitting property so that a projected glare pattern can be photographed from the rear side. For example, it is formed in a shape that matches the curvature of the retina of the human eye with a material such as glass or resin being translucent. Further, the screen 120 of the present embodiment has a rough surface (ground glass) on the outer surface of the housing 101. As a result, the state of occurrence of glare is projected on the screen 120. The rough surface processing of the screen 120 is formed by well-known surface processing such as sand blasting or sanding. Moreover, the rough surface should just be formed in at least one on the curved surface of the inner side of the screen 120, and an outer side. In this embodiment, the member processed into the shape of the retina is used as a screen by roughening the surface, but the present invention is not limited to this. It can also be rendered translucent to the extent that it can be used as a screen by coloring or the like.

  The throttle part 130 is composed of a plate part 131 and a through hole 132. The plate portion 131 is formed in a shape that can slide in accordance with a slide portion (not shown) formed in the housing 101. The through hole 132 is formed on the optical path through which the light beam incident from the corneal model lens 110 passes when the plate portion 131 is attached to the housing 101. Here, the diameter of the through-hole 132 is formed in accordance with the pupil diameter when a general eye is opened in a dark place in order to reproduce the situation where the pupil is opened in a dark place where glare is likely to occur. ing. Here, the diameter of the through hole 132 is fixed, but the diameter of the through hole 132 may be variable. When the diameter of the through-hole 132 is variable, it becomes easy to confirm the occurrence state of glare under various conditions (such as brightness) at the design stage of the intraocular lens 10. In addition, as a method of adjusting the diameter when the through hole 132 is variable, it may be automatically performed by a known electric mechanism in addition to manual operation. In addition, a plurality of throttle portions 130 in which through holes 132 having different diameters are formed may be switched to the housing 101 manually or automatically.

  The intraocular lens holding part 140 includes a plate part 141, a through hole 142, and a holding part 143 for holding the intraocular lens 10 on the rear side (screen 120 side) of the plate part 141. The plate portion 141 is formed in a slidable shape that matches the slide portion of the housing 101. The through-hole 142 is formed at a position where the light beam that has passed through the diaphragm portion 130 passes when the plate portion 141 is attached to the housing 101. Note that the diameter of the through hole 142 is wide so that when the light beam is obliquely incident on the intraocular lens 10 held by the holding unit 143, the light beam sufficiently hits the periphery of the optical unit. That is, a space similar to that in which the intraocular lens is installed in the human eye is formed around (in front of) the intraocular lens 10 (optical unit) held by the holding unit 143. Note that the holding portion 143 of the present embodiment is formed by a groove (concave portion) having a diameter larger than the diameter of the through-hole 142, and the entire intraocular lens 1 is fitted by fitting the support portion in the position of the groove. It is the structure to hold. The diameter of the groove here is larger than the diameter of the through-hole 142 and slightly smaller than the outermost shape of the opened intraocular lens 10. As a result, when the intraocular lens 10 is attached, the entire intraocular lens 10 is slightly compressed, and the intraocular lens 10 is caused by the restoring force generated when the support part is attached to the holding part 143 (groove). It is to be retained. Note that the configuration of the holding unit 143 is not limited to this, and may be any configuration as long as the entire intraocular lens 10 is held by the support unit.

By using the model eye unit 100 having the above-described configuration, the intraocular lens 10 can be inspected under a condition closer to the state in which the intraocular lens 10 is attached to the human eye. In addition, the intraocular lens 10 can be easily replaced by simply attaching and detaching the intraocular lens holding unit 140 at the position of the opening 105 of the housing 101. Here, the diaphragm 130 and the intraocular lens holding unit 140 are separate members and are configured to be detachable from the housing 101 individually. In addition to this, an aperture unit 130 and an intraocular lens holding unit 140 that are integrally formed may be detachable from the opening 105. Alternatively, the diaphragm unit 130 may be fixed to the housing 101, and at least only the intraocular lens holding unit 140 may be configured to be attached to and detached from the housing 101.

  A photographing unit 130 for photographing the screen 120 is placed on the rear side away from the screen 120 by a predetermined distance. The photographing unit 130 includes a known image sensor such as a CCD, and the image sensor is placed at a position substantially conjugate with the screen 120. Further, a monitor 131 is connected to the photographing unit 130 so that an image of the screen 120 photographed by the photographing unit 130 is displayed. In addition, without providing the imaging unit 130 in the intraocular lens inspection apparatus 1, the occurrence state of glare may be confirmed by the operator directly viewing the projection pattern projected on the screen 120.

The light source unit 200 includes a light source 210 and an optical member 220 for expanding the diameter of the light beam emitted from the light source 210 to such an extent that the entire corneal model lens 110 can be irradiated. For example, as the light source 210, an LED light source or the like is used in addition to a laser light source that can secure a sufficient amount of light. For the optical member 220, a known lens, a beam expander, a diffusion plate, or the like is used. For example, by using a well-known lens for the optical member 220, the irradiation light from the light source 210 is changed to a spherical wave. Further, by using a beam expander for the optical member 220, the irradiation light from the light source 210 is changed to a plane wave. In addition, by using a diffusing plate for the optical member 220, the light is changed to diffuse light having an arbitrary shape. The optical member 220 as described above may be selected so as to widen the diameter of the light beam emitted from the light source 210 so that the entire corneal model lens 110 can be irradiated.
In addition, when a light source that irradiates a light beam having a predetermined spread (for example, diffused light) such as a halogen lamp is used as the light source 210, the light beam from the light source 210 is directly applied to the cornea model without providing the optical member 220. The lens 110 may be irradiated.

  The model eye unit 100 and the photographing unit 300 configured as described above are placed on the support base 150. The light source unit 200 is placed on the support base 250. The support base 150 and the support base 250 are each attached to a common base 260. Further, in this embodiment, the support base 250 is fixed to the base 260, while the support base 150 is attached to the base 260 so as to be rotatable. That is, it is configured to rotate around the rotation axis O set on the model eye unit 100. Here, the rotation axis O is provided at a position passing through the corneal apex position (axis center) of the corneal model lens 110. In addition to this, when the model eye unit 100 is rotated in a predetermined angle range (a rotation angle range required for performing a glare test, for example, an angle range of 60 degrees), the rotation axis O is a light source unit. 200 is set at a predetermined position on the model eye unit 100 so that the light beam 200 (center of the optical axis) is always incident on the corneal model lens 120. Thereby, when the model eye unit 100 is rotated in a rotation angle range necessary for the glare inspection, the light beam (optical axis center) is preferably incident on the corneal model lens 120.

  In addition, when the light beam is incident on the model eye unit 100 within a predetermined angle range, the light beam always passes through the corneal model lens 120, and the model eye unit 100 is fixed and the light source unit 200 is fixed. The structure rotated may be sufficient.

  Next, the operation in the case of inspecting the occurrence of glare in the intraocular lens 10 using the intraocular lens inspection apparatus 1 as described above will be described. First, an example in which the intraocular lens 10 is inspected at the development stage of the intraocular lens 10 will be described. FIG. 3 is a view of the intraocular lens inspection apparatus 1 shown in FIG. 1 as viewed from above, and shows a use state of the intraocular lens inspection apparatus. FIG. 4 is a photographed image of the screen 200 obtained by photographing by the photographing unit 300, and shows the state of occurrence of glare.

First, the operator attaches a support part of the intraocular lens 10 to be inspected to the holding part 143 (groove) of the intraocular lens holding part 140 to hold the intraocular lens 10. Next, a liquid having a refractive index close to that of a body fluid such as physiological saline is preferably put through the opening 105 to collect the liquid in the entire housing 101. In addition, since the liquid is stored in the housing 101, an inspection in a state closer to an actual human eye is performed. Next, the diaphragm unit 130 and the intraocular lens holding unit 140 are attached to the housing 101 via a slide unit (not shown).

  Next, the occurrence state of glare when the model eye unit 100 (or the light source unit 200) is rotated within a predetermined rotation angle range is confirmed. The rotation angle is determined within an angle range in which the presence or absence of glare can be confirmed by irradiating the peripheral edge of the optical unit with a light beam.

  As shown in FIG. 3A, when the light source 210 of the light source unit 200 is turned on in a state where the optical axis L2 of the model eye unit 100 and the optical axis L1 of the light source unit 200 are substantially coincident, The diameter of the irradiated light beam is expanded by the optical member 220 and enters the corneal model lens 110 of the model eye unit 100. The light beam that has passed through the corneal model lens 110 illuminates the optical part of the intraocular lens 10 through the through-hole of the diaphragm part (pseudo iris) 130. Then, the light beam that has passed through the intraocular lens 10 is projected onto the screen 120. In the present embodiment, since the outer curved surface of the screen 120 is rough, a projected pattern by light transmitted or reflected by the intraocular lens 10 appears on the screen 120. The projection pattern (edge glare occurrence state) that appears on the screen 120 is photographed by the photographing unit 130.

  FIG. 4A shows a captured image of the screen 120 at this time. As shown in FIG. 3A, when incident light is incident straight on the axial center O of the corneal model lens 110, no incident light is irradiated to the edge portion of the optical unit (even if irradiated). Edge glare is not confirmed from the projected pattern.

  By the way, the glare generated by the reflection of the incident light by the edge portion of the optical unit is likely to be generated when the incident angle of the light beam with respect to the intraocular lens 10 (optical unit) is increased (incident obliquely). Therefore, the operator rotates the support base 150 on which the model eye unit 110 is placed at a predetermined rotation angle about the axis O of the corneal model lens 110 as a rotation axis, thereby making incident light on the model eye unit 110 incident. Observe the change in the state of occurrence of glare G by changing the incident angle.

  As shown in FIG. 3B, the support 150 is rotated at an angle θ1 with the axis center of the corneal model lens 110 as the rotation axis O. Thereby, the light beam irradiated from the light source unit 200 enters the corneal model lens 110 from an oblique direction. As a result, the light beam that has passed through the through-hole 132 and the through-hole 142 is irradiated to a position shifted from the axial center O of the intraocular lens 10, and a part of the light beam is irradiated to the edge portion of the optical unit. Will be reflected. As a result, as shown in the photographed image of FIG. 4B, arc-shaped glare G is confirmed near the center of the projected pattern on the screen 120.

  Then, as shown in FIG. 3C, when the support 150 is further rotated at an angle θ2 (θ1 <θ2) with the axis center of the cornea model lens 110 as the rotation axis O, the light flux with respect to the cornea model lens 110 is reduced. By further increasing the incident angle, the light beam that has passed through each of the through holes 132 and 142 enters the position that is further deviated from the axial center of the intraocular lens 10. Therefore, as shown in the photographed image of FIG. 4C, the glare G that has been confirmed near the center of the projected pattern of the screen 120 is gradually confirmed near the outer periphery of the screen 120.

  As described above, the examiner rotates the model eye unit 100 with respect to the light source unit 200 at a predetermined rotation angle about the axis center of the corneal model lens 110 as the rotation axis O, so that the incident angle of the light flux with respect to the optical unit. Will be changed gradually. Then, a change in the state of occurrence of glare projected on the screen 120 is observed through the photographing unit 300.

  As described above, by using the intraocular lens inspection apparatus 1 having the configuration of the present invention at the development stage of the intraocular lens 10, it is possible to suitably reproduce the state of occurrence of glare that may occur in the human eye. Become. Therefore, it becomes possible to design an intraocular lens in which the occurrence of glare is suitably suppressed. As shown in FIG. 1, a monitor 301 may be connected to the photographing unit 300, and a glare G of the intraocular lens 10 may be confirmed via the monitor 301 on a photographed image photographed by the photographing unit 300.

  The intraocular lens inspection apparatus 1 as described above is convenient when used in the manufacturing stage of the intraocular lens 10. In this case, an intraocular lens determination device for determining pass / fail of the intraocular lens 10 is connected to the imaging unit 300 of the intraocular lens inspection apparatus 1 having the above configuration. In addition, a control unit for controlling the operation of the entire intraocular lens inspection apparatus 1 is provided.

  A control means (not shown) includes a case 101 in which an intraocular lens holding unit 140 in which an intraocular lens 10 to be examined is held in advance by a holding unit 143 is stored in a liquid having a predetermined refractive index. Is automatically arranged at the position of the opening 105. Then, by driving an electric mechanism (not shown), the support base 150 on which the model eye unit 100 and the photographing unit 300 are placed is rotated at a predetermined rotation angle with the axis center of the corneal model lens 110 as the rotation axis O (eye). The rotation of the optical part of the inner lens 10 is performed at a predetermined rotation angle so that the light beam is irradiated onto the edge of the optical part). On the other hand, the control unit shoots the screen 120 by driving control of the shooting unit 300. The image information acquired by the imaging unit 300 is sent to the intraocular lens determination device. It is assumed that luminance threshold information for glare determination is stored in advance in the intraocular lens determination device. As a result, the location of occurrence of glare is extracted by comparing the luminance information stored in the memory with the luminance information constituting the captured image of the screen 120. Then, as a result of extracting the glare occurrence state of the intraocular lens 10 at a predetermined rotation angle, only the intraocular lens 10 determined as having no glare may be employed.

  As described above, an intraocular lens inspection apparatus including a model eye unit having a configuration closer to that of the actual human eye is used at the manufacturing stage of the intraocular lens 10, so that an intraocular lens that exceeds the standard at which glare occurs at the manufacturing stage can be obtained. It can be removed with high accuracy, and an intraocular lens can be provided more suitably.

  The intraocular lens inspection apparatus 1 (model eye unit 100) is not limited to the above configuration. FIG. 5 shows a modified example of the configuration of the model eye unit 100. Here, a cross-sectional view of the model eye unit 100 cut from the top and bottom at the position of the optical axis L2 and viewed from above (opening 105 side) is shown. In FIG. 5, the same components as those in the above-described intraocular lens inspection apparatus 1 will be described with the same reference numerals.

  Here, the position where the intraocular lens 10 is held by the intraocular lens holding unit 140 is provided at a position decentered with respect to the optical axis L2. That is, the holding portion 143 is formed in an eccentric position with respect to the through hole 142 in a state where the plate portion 141 is attached to the housing 101. As a result, the light beam emitted from the light source unit 200 is easily radiated to the edge portion of the intraocular lens 10 held by the holding portion 143, and the amount of light emitted to the edge portion is sufficiently secured, so that the glare can be further increased. It becomes possible to confirm the occurrence state of this.

It is a schematic explanatory drawing of an intraocular lens inspection apparatus. It is explanatory drawing of the internal structure of a model eye unit. It is explanatory drawing of the use condition of an intraocular lens test | inspection apparatus. It is explanatory drawing of the generation | occurrence | production state of glare. It is an example of modification of a model eye unit.

DESCRIPTION OF SYMBOLS 1 Intraocular lens inspection apparatus 100 Model eye unit 105 Opening part 110 Corneal model lens 120 Screen 130 Diaphragm | squeezing part 130
140 Intraocular lens holding unit 150, 250 Support base 200 Light source unit 300 Imaging unit 301 Monitor

Claims (8)

In an intraocular lens inspection apparatus for measuring optical characteristics of an intraocular lens,
A corneal model lens having a curved surface matched to the corneal curvature of a human eye, and a screen having a curved surface matched to the retinal curvature, wherein the corneal model is a detachable part provided between the corneal model lens and the screen. A model eye unit having an attachment / detachment unit for detachably installing the intraocular lens at a position corresponding to a distance from the cornea of the human eye to the crystalline lens with respect to the lens;
A light source unit for irradiating the model eye unit with a light beam having a predetermined spread;
A rotation mechanism for rotating at least one of the model eye unit and the light source unit in order to change the incident angle of the optical axis center of the luminous flux with respect to the corneal model lens;
An intraocular lens inspection apparatus comprising: The intraocular lens inspection apparatus according to claim 1, from the rear side of the screen, captures a projected pattern of the light beam projected onto the screen via the corneal model lens and the intraocular lens installed on the detachable portion. An intraocular lens inspection apparatus comprising an imaging unit for the purpose. In the intraocular lens inspection apparatus according to claim 2,
The intraocular lens inspection apparatus, wherein the model eye unit is a housing capable of storing a liquid having a predetermined refractive index in a space between the corneal model lens and the screen. An intraocular lens inspection apparatus according to claim 3 is provided.
An intraocular lens inspection apparatus comprising: a monitor for displaying a photographed image photographed by the photographing unit. The intraocular lens inspection apparatus according to claim 4,
Glare detection means for detecting the glare by performing image processing on a photographed image photographed by the photographing unit;
An intraocular lens inspection device comprising: an intraocular lens determination unit for determining whether the intraocular lens is good or not based on a detection result by the glare detection unit.   6. The intraocular lens inspection apparatus according to claim 1, wherein a rotation axis of the rotation mechanism is a predetermined angle required for the model eye unit or the light source unit to perform a glare inspection. An intraocular lens inspection device provided at a predetermined position on the model eye unit so that an optical axis center of the light beam passes through the corneal model lens when rotated in a range. The intraocular lens inspection apparatus according to claim 6.
The intraocular lens inspection apparatus, wherein the rotation axis passes through an axial center of the corneal model lens.   8. The intraocular lens inspection apparatus according to claim 1, wherein the luminous flux is a spherical wave, a plane wave, or an arbitrarily shaped diffused light.