SU1765802A1 - Lens for ophthalmology - Google Patents

Lens for ophthalmology Download PDF

Info

Publication number
SU1765802A1
SU1765802A1 SU904816365A SU4816365A SU1765802A1 SU 1765802 A1 SU1765802 A1 SU 1765802A1 SU 904816365 A SU904816365 A SU 904816365A SU 4816365 A SU4816365 A SU 4816365A SU 1765802 A1 SU1765802 A1 SU 1765802A1
Authority
SU
USSR - Soviet Union
Prior art keywords
surface
lens
aspherical
optical power
spherical
Prior art date
Application number
SU904816365A
Other languages
Russian (ru)
Inventor
Михаил Михайлович Русинов
Александр Пантелеймонович Грамматин
Сергей Михайлович Марчук
Original Assignee
Ленинградский Институт Точной Механики И Оптики
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 Ленинградский Институт Точной Механики И Оптики filed Critical Ленинградский Институт Точной Механики И Оптики
Priority to SU904816365A priority Critical patent/SU1765802A1/en
Application granted granted Critical
Publication of SU1765802A1 publication Critical patent/SU1765802A1/en

Links

Abstract

Use: ophthalmologists. Summary of the invention: in a lens, the second surface of which is spherical, the first surface is made aspherical by the equation of the form / r +... + An pn + where p Vx2 + y2-1 silt.

Description

The invention relates to the field of optical instrumentation, and more specifically to ophthalmic lenses with different optical power in different directions of sight - in the direction of sight to infinitely distant and closely spaced objects - and can be used in ophthalmology to correct the refraction of the human eye.

A known ophthalmic lens with different optical power in different directions of sight, in which the first surface is aspherical and has a smooth curve, the smooth measurement of the curvature of which provides the required change in optical power. The second surface of the lens is made spherical (US patent No. 3687528, CL G 02 C 7/06, publ. 1970).

The disadvantage of this lens is the residual astigmatism of the light beams of the rays outside the central vision zone.

A known ophthalmic lens (German patent No. 1422124, class G 02 C, published 1970) contains an aspheric and spherical surface, in which the aspheric surface is a surface of rotation, characterized by a meridional curve without kinks, the axis of rotation coinciding with the direction of sight on close object. The curvature of the meridional curve changes in such a way that the meridional optical power of the surface decreases from the axis of rotation to the axis corresponding to the direction of sight to an infinitely distant object, and then remains constant.

The disadvantage of this lens is the residual astigmatism of the light beams of the rays outside the central vision zone, which worsens the conditions of observation of closely spaced objects.

As a prototype, an ophthalmologic lens is selected (US Patent No. 4,055,379, class G 02 C 7/08, publ. 1977), with different optical power in various sighting directions, in which the first surface is aspherical and has a meridional curve without fractures, providing a certain number of viewing zones with constant optical power in each of them. The second lens surface is spherical.

The main disadvantage of this lens is the astigmatism of the light beams of the rays outside the central vision zone.

00

WITH

The aim of the invention is to improve the image quality by reducing the astigmatism of light beams when viewing closely spaced objects.

The goal is achieved by the fact that in an ophthalmic lens, the first surface of which is aspherical, the second is spherical, with the axis of rotation of the forming aspherical surface coinciding with the direction of sight to the remote object, the aspherical surface is made in accordance with the equation

1 + 1

Z Ai / 32 + A2 ... + Anj0n

where p Vx2 + y2. x, y, z - rectangular coordinates,

AT, AaAn - coefficients,

p - natural numbers.

The aspherical surface of the proposed type is characterized by the presence of second-order transverse aberrations, which allows, with the required optical power, to achieve complete elimination of the astigmatism of the light beams of the rays for the selected field angle by compensating the second and third order astigmatic components.

The drawing shows an ophthalmic lens, in which surface 1 is aspherical, surface 2 is spherical.

As a specific exemplary embodiment, an ophthalmic lens is proposed, having the following optical characteristics: optical power in a direction

five

0

five

on the diopter axis, the optical power in the 3–3 direction is +2 diopters; W 35 ° and design parameters: mm, d 2.5 mm, 5183, 0.50 mm, aspherical surface equation

Z 4,95392 10 V + 1, / О3-6,370840 bx, 626V10 V5-1,322210 11 p6.

The proposed design of an ophthalmic lens improves the observation conditions of infinitely distant objects and objects located at close distances, with deficiencies in the refraction of the human eye, for example, with static hyperopia,

Claims (1)

  1. The invention is an ophthalmic lens, the first surface of which is aspherical, the second is spherical, the axis of rotation of the forming aspherical surface coincides with the direction of sight at the distant object, and the optical power of the lens by reducing astigmatism, the aspherical surface is made according to the equation
    thirty
    Z Aip2 + A2 + 3 +...+App/o
    l + 1
    where p Vxz + /:
    x, y, z — rectangular coordinates; Ai, A2, ..., An - coefficients; p - natural numbers.
SU904816365A 1990-02-21 1990-02-21 Lens for ophthalmology SU1765802A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU904816365A SU1765802A1 (en) 1990-02-21 1990-02-21 Lens for ophthalmology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU904816365A SU1765802A1 (en) 1990-02-21 1990-02-21 Lens for ophthalmology

Publications (1)

Publication Number Publication Date
SU1765802A1 true SU1765802A1 (en) 1992-09-30

Family

ID=21509420

Family Applications (1)

Application Number Title Priority Date Filing Date
SU904816365A SU1765802A1 (en) 1990-02-21 1990-02-21 Lens for ophthalmology

Country Status (1)

Country Link
SU (1) SU1765802A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129435A (en) * 1998-04-09 2000-10-10 Nike, Inc. Decentered protective eyewear
US7389543B2 (en) 2004-06-30 2008-06-24 Nike, Inc. Optically decentered face shield

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Патент US № 4055379, кл. G 02 С 7/06, опублик. 1977. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129435A (en) * 1998-04-09 2000-10-10 Nike, Inc. Decentered protective eyewear
US6755525B2 (en) 1998-04-09 2004-06-29 Nike, Inc. Decentered protective eyewear
US7389543B2 (en) 2004-06-30 2008-06-24 Nike, Inc. Optically decentered face shield

Similar Documents

Publication Publication Date Title
Atchison et al. Optics of the human eye
Legge et al. Tolerance to visual defocus
Koomen et al. The spherical aberration of the eye
El Hage et al. Contribution of the crystalline lens to the spherical aberration of the eye
US4195919A (en) Contact lens with reduced spherical aberration for aphakic eyes
EP0888564B1 (en) Improved diffractive multifocal ophthalmic lens
EP0742465B1 (en) Multifocal toric contact lenses
CN1028258C (en) Lens design method and resulting aspheric
FI79619C (en) Intraokulaer lins.
Seiler et al. Effective spherical aberration of the cornea as a quantitative descriptor in corneal topography
US5532875A (en) Wide angle binocular system with variable power capability
AU706878B2 (en) Concentric annular ring lens designs for astigmatic presbyopes
US5980040A (en) Pinhole lens and contact lens
US4504982A (en) Aspheric intraocular lens
US7490936B2 (en) Enhanced electro-active lens system
CN1071902C (en) Multifocal ophthalmic lens pair
US5796462A (en) Aspheric toric lens designs
US6199984B1 (en) Progressive addition lenses with varying power profiles
US6070981A (en) Ophthalmologic characteristic measuring apparatus
CA2175652C (en) Multifocal lens designs with intermediate optical powers
Wald et al. The change in refractive power of the human eye in dim and bright light
CN102892380B (en) Single micro structure eyeglass, system and method
JP4519205B2 (en) Concentric single viewpoint lens and its design method
Ingelstam et al. Eye refraction examined by aid of speckle pattern produced by coherent light
JP5096662B2 (en) Lens manufacturing method and lens manufactured by the method