SU1641326A1 - Method for refractive keratoplasty - Google Patents

Abstract

The invention relates to ophthalmology and is used in the treatment of high myopia. The aim of the invention is to reduce postoperative astigmatism. In the paracentral zone of the cornea, after marking its central optical zone of 3.5 mm, at 6.0 and 12 o'clock, using a diamond knife, make a notch 1/3 of the thickness acute and 1.5 mm long. . Then, using a semi-oval lamella, they are successively inputted through the notches made, in the middle layers of the cornea, its circular separation is bluntly made. In the layers of the cornea, a channel having the shape of a ring B formed by the channel from the front surface of the cornea is formed circumferentially, a 1 mm wide collagen filament, excised from the donor's cornea, is inserted. The thickness of the collagen thread is adjusted depending on the required degree of myopia reduction.

Description

This invention relates to ophthalmology, and more specifically to refractive keratoplasty.

The purpose of the invention is to reduce postoperative astigmatism.

The goal is achieved as follows.

In the paracentral zone of the cornea, after marking its central optical zone equal to 3.5 mm, at 6.0 and 12 o'clock, using a diamond knife, make notches 1/3 the thickness of the stroma and 1.5 mm long. Then, using the semi-oval delamination, they are successively entered through the incisions made in the middle layers of the cornea in a blunt way make its circular separation. A ring-shaped channel is formed in the cornea layers. A collagen graft 1.0 mm wide, excised from the donor's cornea, is freely introduced into the annular channel formed, from the anterior surface of the cornea, with the help of a conductor curved around the circumference. The thickness of the collagen graft is adjusted depending on the required degree of reduction of myopia, its length corresponds to the circumference.

Example Patient C was admitted to the clinic for eye diseases with a diagnosis: the myopia of both eyes is highly complicated, and / b No. 1094 Acute vision of the right eye is 0.005 with SF. - 18.0, 09, of the left eye 0.02 sf. - 16.0, 2. In the molecular region, marked dystrophic changes. After epibulbar and retrobulbar anesthesia of the right eye, with the help of a keratotomy set of markers, in the paracentral zone of the cornea, after marking its central optical zone of 3.5 mm, at 6.0 and 12 hours, using a diamond knife, we made notches with a depth of 1/3 of the stroma thickness and 1.5 mm long. Then, using a semi-oval lamella, they were successively entered through the incisions made in the middle layers of the cornea in a circular way. In the layers of the cornea, a channel having the shape of a ring was formed. Into the formed annular channel, a collagen filament prepared in advance from the donor's cornea was inserted from the front surface of the cornea with the help of a conductor curved around the circumference.

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the introduction of the graft changed the configuration of the anterior surface of the cornea — its center remained the same thickness, and the para-central zone increased around the entire circumference by the thickness of the graft. On the first day after the operation, the graft brightened and at a later time it could be seen only in the environment of a slit lamp. The cornea retained its transparency throughout the entire observation period. On the seventh day, the eye was completely calmed down, and by two weeks the working capacity had fully recovered. In the postoperative period, the visual acuity of the right eye was 0.005 sf. - 10.0, 2. According to the data of ophthalmometry and refractometry, the refractive ability of the cornea in the central optical zone decreased by 8.0 D. There is no postoperative astigmatism.

Using the proposed method of refractive keratoplasty allows

reduce the refractive ability of the central optical zone of the cornea by introducing a collagen filament interla rly but without extensive stratification of its central optical zone, maximally preserving nerve fibers going from the limbus to the center.

Claims (1)

Invention Formula The method of refractive keratoplasty, consisting in applying from the anterior surface of the cornea two central radial incisions up to 1.5 mm long to a depth of 1/3 of the stroma thickness the cornea, the formation of a circular canal at the depth of the incisions and the introduction of an implant through the front surface of the cornea around the entire circumference of the cornea, characterized in that, in order to reduce postoperative astigmatism, the collagen implant is freely placed in the canal.