RU2000758C1 - Method for coloring hydrogel contact lens blue - Google Patents

Abstract

The invention relates to medicine, in particular to methods for the cosmetic coloring of hydrogel contact lenses. The indicated goal is achieved by that. that after processing the lens with solutions of nitric acid silver and sodium thiosulfate, the hydrogel contact lens is immersed for 40 min in a solution of the following composition: iron-alumina alum 2.1 g / l, oxalic acid 50.0 g / l; red shelter for salt 10.0 g / l; potassium dichromic acid 1% 1.3 g / l, the rest is water.

Description

The invention relates to medicine, in particular to methods for the cosmetic coloring of hydrogel contact lenses.

Cosmetic contact lenses are an effective means of masking and correcting eyesight in case of defects in the anterior part of the eye block, which are the result of many surgical interventions, injuries, congenital pathologies, etc. In addition to medical purposes, the use of contact lenses should be involved in the system of medical and social rehabilitation of patients, aimed at restoring the status of a full-fledged personality.

The use of cosmetic contact lenses has shown their undeniable advantage over various methods of previously used cosmetic methods for masking eye lesions; operations, prosthetics, etc.

In recent years, the use of soft soft hydrogel contact lenses, which have proven to be superior to hard contact lenses, has become especially important, since the latter are difficult to select with an irregular scarred shape of the cornea, it is impossible to use with bullous keratopagi, combined with clouding of the cornea, as well as from due to the adverse effect of the toughest lens on the cornea with trophic disturbance.

However, the use of hydrophilic contact lenses does not completely eliminate the cosmetic defect due to the color difference between the healthy and affected eyes, which does not allow us to talk about the complete rehabilitation of the patient. Brown hydrophilic corneoscleral lenses have been stained in brown at various densities.

Such a method can lead to the complete rehabilitation of only a part of patients, in connection with different colors of the irises of patients' eyes.

As an analogue, a method for coloring soft contact lenses in brown with a 25% silver nitrate solution is known.

As a prototype, a method of coloring with a cosmetic purpose of a contact lens in blue color with an aqueous solution of indigo carmine of 0.5-5% concentration and tertrazine of 0.5-10% concentration was selected.

However, these methods do not provide stable staining of the material of the soft contact lens, they are relatively quickly washed out of it, which leads to its discoloration.

The technical result obtained by the implementation of the proposed method is the ability to maintain the blue color of the hydrogel contact lens for 6-7 months, which is important for cosmetic purposes for various disfiguring defects of the eye block.

The proposed method for staining a hydrogel contact lens in blue by applying a dye to its outer surface involves pretreating the lens with a 25% silver nitric acid solution and fixing it in a 10% sodium thiosulfate solution. Next, the lens is immersed in a solution of the following composition:

Ammonium iron

alum 2.1 g / l

Oxalic acid 50.0 g / l

Red shelter for salt 10.0 g / l

Potassium dichromate

acid 1% 0.0013 g / l

Waterfall 1 l.

SUMMARY OF THE INVENTION

that the contact lens is placed in distilled water for 2 hours. Then it is placed on the punch of the required radius. The punch is placed in a special device for painting soft contact lenses.

0 The central zone of the lens is covered and a 25% solution of silver nitric acid is applied to the outer surface of the lens with a brown color of the required diameter of the haptic zone of the lens, i.e. the required diameter of the iris, cornea. Exposure to brown color for 10-60 s. The field of which the lens is washed in distilled water for 3-4 minutes: fixed with a 10% sodium thiosulfate solution.

0 After fixing, the lens is placed in distilled water for 20 minutes. Aqueous solutions of the dyes of the invention are taken and poured in equal amounts into a flask. The tinted lens holds

5 in solutions of 20-40 minutes - depending on what intensity of blue color is needed. The temperature of the water bath is 30 ° C. When the desired color is achieved, the lens is washed for 20 minutes with distilled water and fixed with a 10% sodium thiosulfate solution for 20 minutes. After which the lens is washed for 20 minutes. When the black pupil of the lens is formed, it must again be placed on

5 punch, cover part of the blue-colored lens and apply a 25% silver nitrate solution to the outer surface. Exposure for 2-3 minutes After which the lens is washed in distilled water for 5-10 minutes, fixed in 10%

sodium thiosulfate solution for 5 minutes. The finished lens is removed from the punch, placed on distilled water for 1 hour. Once boiled for 10-15 minutes in physiological saline, treated with 3% hydrogen peroxide solution and 2.5% sodium thiosulfate solution. After that, the lens is placed in a container for lenses, 0.9% saline solution is poured, and after 12 hours the lens is placed on the ocular block. During the clinical examination of the patient, if necessary, correlation of the color gamut of the colored zone of the lens is possible,

PRI me R 1. Tinting the lens in bright blue.

A hydrogel contact lens with 40% moisture content, diameter 14.5, inner radius of curvature 8.4, refraction (-) 1.0 D is placed in distilled water for 2 hours. It is necessary to color the lens with a transparent center 3.0 mm, the diameter of the colored zone 11 , 0 mm. The lens fits onto punches with a radius of curvature of 8.4 mm. The central zone of the 3.0 mm lens is covered and the punch is placed in the lens tinting device. A 25% silver nitrate solution, i.e. the haptic zone is colored — the area of the iris D 11.0 mm. Exposure of coloring 20 s. Then the lens is washed for 3-4 minutes in distilled water. Divorce tc in separate buttons:

1ammonium alum 2.1 g / l

2 red roof on

salt 1.0 g / l

3 potassium dichrome

sour 0.0013 g / l

4 oxalic acid. 50 g / l

1.0 ml of the proposed solutions are poured into a separate jar with a volume of 10.0 ml and the lens is lowered into a separate flask. A bottle with a lens is placed in a water bath at a temperature of 30-40 ° C. During the period of approx. Curing, color formation is observed. Upon reaching a bright blue color, the lens is washed for 10 minutes in distilled water and a 10% sodium thiosulfate solution is fixed for 20-25 minutes. Washed again for 10 minutes and boils in distilled water for 5-10 minutes. Then, treating the lens with a 3% hydrogen peroxide solution for 15 minutes and in a sodium thiosulfate solution for 15 minutes. The finished lens is placed in a container with 0.9%

saline solution. After 24 hours, it is placed on the ocular block.

PRI me R 2. The color of the lens in a pale blue color. A hydrogel contact lens of 40% moisture content, a diameter of 14.5 mm, an internal radius of curvature of 8.6 mm, refraction (-) 1.0 D, is placed in distilled water for 2 hours. It is necessary to color the lens with a transparent center D 3.0 mm, the diameter of the haptic zone is 12.0 mm.

Then it is laid on a punch with a radius of curvature of 8.6 mm. The central area of the lens with a diameter of 3.0 mm is covered so that the solution does not fall on the pupil area. Then, a 25% solution of silver nitric acid is applied to the outer surface of the lens. The diameter of the haptic zone, i.e. zone of the iris 12.0 mm Exposure of the color of the haptic zone for 10 s, after which the lens is washed in distilled water for 3-4 minutes and fixed with a 10% sodium thiosulfate solution. After fixation, the lens is placed in distilled water for 20 minutes. Then, the proposed solutions are diluted in separate flasks:

1 iron ammonium

alum 2.1 g / l

2 oxalic acid 50 g / l

3 red roof on

salt 10 g / l

4 kagliy dvukhromovy

acidic 0.0013 g / l.

In a flask of 10.0 ml, 1.0 ml of iron ammonium alum, oxalic acid, red blood salt and potassium dichromic acid are poured. A brown-colored lens is dropped into a bottle with poured solutions. Then the bottle with a lens is placed in a water bath at a temperature of 30-40 ° C. During the staining period, the formation of the desired faint blue color is observed. After which the lens is washed for 10 minutes in distilled water, fixed with 10% sodium thiosulfate solution for 20-25 minutes and washed with distilled water for 60 minutes, boiling the lens for 10 minutes in distilled water. After that, the tinted lens is treated with a 3% hydrogen peroxide solution for 15 minutes. The solution is drained and poured with 2% sodium thiosulfate solution for 15 minutes. The finished lens is placed in a container with 0.9% saline and after 12-24 hours it is placed on the eye block.

(56) Bulletin of Ophthalmology. 1986. 2 sec 20-31,

7 20007588

Claims (1)

The formula of the invention is sodium, then the lens is immersed in a HYDROGEL STRAWING METHOD of the following composition of a g / lt lens in BLUE COLOR by applying iron-ammonium alum21 Ki dye on its outer surface A feature characterized in that: 5 Red roof on salt 100 pre-treated with a lens 25% -Dichromic acid potassium silver nitrate solution, 1% 0.0013 fixed in 10% thiosulfa-Water solution Up to 1 L