System for enlarging a retinal image
First Claim
1. A system for enlarging a retinal image, comprising:
- an intraocular implant having a peripheral portion and a central portion with negative power, a lens with positive power designed to be arranged outside the eye, the lens and the implant being able to produce an enlarged image of an object at the back of an eye of a standard user, in which, for a pupil 1.5 mm in diameter, any point object in a reading object field produces at the back of the eye an image spot of a size comprised between 20 and 50 μ
m, for a wavelength in the visible spectrum.
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Accused Products
Abstract
The invention relates to a system for enlarging a retinal image, comprising an intraocular implant and an external lens. The implant comprises a peripheral part and a central part with a negative power. The lens has a positive power and is for arrangement outside the eye, typically in a glasses frame. The lens and the implant produce an enlarged image of an object at the back of the eye of a standard user. For a pupil with a diameter of 1.5 mm, each point object in a reading field forms a dark image of a size between 20 and 50 μm at the back of the eye. The invention permits a large reading field, at the cost of a degradation in the performance of the system along the axis, acceptable when taking into account the acuity of the patients treated and, furthermore, provides a system with little variation in performance with displacement of the lens from the nominal position.
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Citations
27 Claims
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1. A system for enlarging a retinal image, comprising:
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an intraocular implant having a peripheral portion and a central portion with negative power, a lens with positive power designed to be arranged outside the eye, the lens and the implant being able to produce an enlarged image of an object at the back of an eye of a standard user, in which, for a pupil 1.5 mm in diameter, any point object in a reading object field produces at the back of the eye an image spot of a size comprised between 20 and 50 μ
m, for a wavelength in the visible spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for determination by optimization of a system for enlarging a retinal image, comprising:
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choosing an eye model, wearing conditions, an intraocular implant and a lens external to the eye;
modifying the characteristics of the implant and the lens in order that, in a reading object field, any point object produces at the back of the eye an image spot of a size comprised between 20 and 50 μ
m. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification