RU50407U1 - SOFT CONTACT LENS - Google Patents

Abstract

The utility model relates to ophthalmology. The objective of the utility model is to create a soft hydrogel contact lens with the possibility of preserving blue for 6-7 months and correlating the color gamut for cosmetic purposes. The essence of the utility model: on the outer surface of the periphery of a soft contact lens, a blue dye is applied containing ammonium alum, oxalic acid, red blood salt, potassium dichromic acid and water, in the following ratio of components, g / l:

ammonium alum 2.1 oxalic acid fifty red blood salt 10 potassium dichromic acid 0.0013 water up to 1 l

Description

The utility model relates to medicine, more specifically to ophthalmology, and can be used to mask and correct vision for defects in the anterior eyeball, which are the result of many surgical interventions, injuries, congenital pathologies, etc. In addition to medical purposes, the use of contact lenses should participate in the system of medical and social rehabilitation of patients, aimed at restoring the status of a full-fledged personality.

As the closest technical solution to the utility model, a soft contact lens made of a hydrogel with a dark dye applied on the outer surface in the transparent pupil zone and indigo-carmine and tertazin (G.B. The experience of using domestic soft cosmetic contact lenses "," Bulletin of Ophthalmology. 1986. No. 2. p.29-31).

However, the known dye is relatively quickly washed out of the hydrogel after 2-3 months, which leads to discoloration of the soft contact lens in the blue color zone, while the correlation of the blue color is impossible.

The objective of the utility model is to create a soft hydrogel contact lens with the possibility of preserving the blue color for 6-7 months and correlating the color gamut, which is important for cosmetic purposes for various disfiguring eyeball defects.

The technical result, according to the utility model, is achieved by the fact that in a soft contact lens made of hydrogel with a dark dye applied on its outer surface in the pupil zone, and on the periphery of a blue water-based dye, characterized in that the blue dye contains

ammonium iron alum, oxalic acid, red blood salt, potassium dichromic acid 1% and water, in the following ratio of components, g / l:

ammonium alum 2.1 oxalic acid 50,0 red blood salt 10.0 dichromic acid potassium 1% 0.0013 water up to 1l

When using the proposed composition of an inorganic dye of blue color, if necessary, a correlation of the color gamut of the painted area depending on the exposure of the color is possible. For example, when the exposure is less than 1.5 seconds, the iris zone is painted in a slightly blue color, and when the exposure is more than 1.5 seconds, the formation of the brightness of the blue color is monitored under visual control, while the blue color remains for 6-7 months.

As a dark dye, for example, you can use a 25% solution of silver nitrate with a brown color.

The utility model is illustrated in the drawing, which shows a contact lens 1 with zone 2 of the iris and pupil zone 3.

The color of the lens is slightly blue. Hydrogel contact lens 40% moisture content, diameter 14.5 mm, external radius of curvature 8.6 mm, refraction (-) 1.0 D, placed in distilled water for 2 hours. It is necessary to color

a lens with a transparent center D 3.0 mm, the diameter of the haptic zone 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 nitric acid silver is applied to the upper surface of the lens. The diameter of the haptic zone, i.e. zone of the iris 12.0 mm Exposition of the haptic zone color 10 s. After which the lens is washed in distilled water for 3-4 minutes. and fixed with 10% sodium thiosulfate solution. After fixation, the lens is placed in distilled water for 20 minutes. Then the proposed solutions are taken, diluted in separate bottles; g / l:

iron ammonium alum 2.1 oxalic acid fifty red blood salt 10 potassium dichromic acid 1% 0.0013

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 lowered into a bottle with poured solutions. Then, the flask with the lens is placed in a water bath with a temperature of 30-40 C. During the staining period, the formation of the required weak blue color is observed. After which the lens is washed for 10 minutes. in distilled water, is fixed with a 10% sodium thiosulfate solution for 20-25 minutes. and washed for 60 minutes. distilled water boiling

lenses 10 min. in distilled water. After that, a lens painted in a faint blue color is treated with a 3% hydrogen peroxide solution for 15 minutes. The solution is drained and poured 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 eyeball.

Soft contact lens with blue iris dye Color brightness Preservation of color Suggested Contact Lens from light blue to bright blue 6-7 months Famous contact lens medium blue color 3-1 months

A soft contact lens, according to a utility model, was installed on 36 eyes of 30 patients with a high cosmetic effect within 6-7 months.

Claims (1)

A soft contact lens made of hydrogel with a dark dye applied on the outer pupil in the transparent pupil zone, and in the zone of the iris of the blue dye on a water basis, characterized in that the blue dye contains iron ammonium alum, oxalic acid, red blood salt, potassium dichromic acid 1% and water, in the following ratio of components, g / l: Ammonium Alum 2.1 Oxalic acid fifty Red blood salt 10 Potassium dichromic acid 1% 0.0013 Water Up to 1 liter