SU1533689A1 - Method of protecting retina against phototoxic effects of visible light - Google Patents

Abstract

This invention relates to medicine. Light is transmitted to the periphery of the retina with a shorter wavelength than to the central one. The method allows you to maintain normal twilight vision and easily adapt to changes in light.

Description

one

(21) 3977348 / 28-14

(22) 12.11.85

(46) 07.01.90. Bksh. № 1

(75) G.E.Stol Renko, V.E. Bocharov and

V.L. Warsaw

(53) 617.7 (088.8)

(56) Ophthalmology, 1983, v 90,

(f 6, p. 937 and 944.

(54) METHOD FOR PROTECTING THE NET PROTECTION FROM THE PHOTOTOXIC ACTION OF VISIBLE LIGHT

(57) The invention relates to medicine. Light is transmitted to the peripheral part of the getchatka with a smaller 1 inoi wave than to the central one. The method allows you to maintain normal twilight vision and easily adapt to changes in light.

The invention relates to medicine, namely to ophthalmology, and can be used in optical correction of vision.

The purpose of the invention is to preserve twilight vision.

This goal is achieved by filtering the light in front of the macular, the region and peripheral regions of the retina in a differentiated manner, with the latter passing light with a wavelength of less than 400 nm.

The method is implemented by applying various optical means — an artificial lens, a contact lens, a pre-corneal lens, glasses, in which the peripheral zone of the optical part is a filtrate, cutting off electromagnetic waves up to 400 nm long, and the central part — filtering up to 500 nm waves. Moreover, the diameter of the central zone of each of the devices is chosen so that the macular region of the retina is in the TSHH of this central filter under physiological light miosis. For this u artificial

lens diameter of the central zone has a diameter of 1.5-3 mm, 3-5 mm for a contact lens, 4-7 mm for a pre-lens, and 15-30 mm for glasses. An artificial lens made according to the invention is implanted in the afactive eye. In bright light, the pupil of a person is in a state of miosis (pupil width about 1.5-2 mm). Under these conditions, the light enters the eye only through the central part of the artificial lens, i.e. through a filter that cuts off electromagnetic radiation with a wavelength of up to 500 nm. Thus, the macular area of the retina and its peripheral part are protected from the most dangerous range of visible light for the retina. When dusk or a person enters a darkened room, his pupil goes into a state of mydriasis, i.e. expands to 4-5 mm. In this case, mokul rnl region of the retina ss yag in the shade of the central filter, however, in case of twilight vision, the rod apparatus of the periphery of the retina works, to which light with a wavelength longer than

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400 nm freely passes through the peripheral part of the artificial lens. The maximum relative visibility in case of twilight vision is in the range of 400-500 nm in length. Thus, twilight vision is practically not impaired during implantation of such a lens.

When implementing a method using a contact lens, a pre-corneal lens, or glasses, the essence of the method does not change. The difference is only in the size of the central filter.

Compared to the known, the proposed method allows to preserve normal twilight vision and easily

Claims (1)

adapt to changes in light. Invention Formula A method of protecting the retina from the phototoxic action of visible light by filtering out a shortwave part with a length of less than 500 nm using optical means, characterized in that, in order to preserve twilight vision, they carry out a differentiated filtration of light in front of the macular area and peripheral areas of the retina, the latter transmit light with a wavelength of less than 400 nm.