[Comparative characterization of the results of new and standard methods of keratotomy]. / Sravnitelnaia kharakteristika rezyltatov novoi i standartnoi metodikkeratotomii.

The authors compare the efficacies of the traditional "Russian" radial keratotomy and the new method of making radial keratotomic incisions with evenly deep profiles. Keratotomy was carried out in 60 patients (120 eyes) with similar binocular myopia. On one eye the traditional "Russian" method was used, on the other the new method. The new method enables the physician to make a radial incision with one movement of a knife with programmed increase of the depth from the center to periphery. The number of incisions was the same on both eyes. In remote periods after surgery (4.5 years, on average) corneal refraction on the eyes operated on using the traditional "Russian" method reduced from 43.2 to 39.5 D and eye refraction from -4.36 to -0.4 D. Corneal refraction on the eyes operated on using the new method reduced from 43.2 to 39.3 and eye refraction from -4.36 to -0.32 D. The new method of keratotomy is not inferior to the traditional method but is more rapid and convenient.

[Asymmetric radial keratotomy for low-grade myopia]. / Kératotomie radiaire asymétrique pour la myopie faible.

Thirty patients (47 eyes) underwent a radial keratotomy for low myopia (from -0.75 to -2.5 D). Surgical technique was as follows: optical zone between 3.0 and 4.5 mm according to the degree of the myopia; two radial incisions in vertical superior and nasal horizontal meridian. The incisions were full thickness, obtained either with the "Russian" (centripetal) technique or with a centrifugal technique, but using a special designed knife. Mean refractive result was 1.73 D. For low myopia, our technique seems less traumatic and the refractive effect more rapidly steady.

[Prevention of postoperative inverse astigmatism during radial keratotomy]. / Prophylaxie de l'astigmatisme postopératoire inverse pendant la kératotomie radiaire.

Seventy eight patients (156 eyes) were treated by radial keratotomy. Patients with spherical axial myopia were selected (including 39% of physiological astigmatism cases). After radial conventional technique the against-the-rule astigmatism > 1.0 D is 31.6% and between 1.0 and 2.0 D is 3.4% versus 0.6% (< 1.0 D) and 0.1% (1.0-2.0 D) with the modified technique. To decrease the frequency of the against-the-rule postoperative astigmatism after RK procedure we performed 1 or 2 vertical additional flag-incisions on the horizontal meridian to counteract the effect of the corneal oedema on the superior incisions.

[Management of corneal microperforations during radial keratotomy]. / Conduite à tenir devant des microperforations cornéennes au cours de la kératotomie radiaire.

Corneal microperforations induce a corneal astigmatism since refractive effect is increased on the perforated meridian. To counteract this induced refractive error, we performed "flag" or tangenital incisions on the perpendicular meridian.

[Radial asymmetric keratotomy in mild-degree myopia]. / Radial'naia asimmetrichnaia keratotomiia pri miopii slaboi stepeni.

The suggested method for surgical correction of weak myopia involves two mutually perpendicular incision on the cornea in the major meridians. These two incisions result in but a slight alteration of the tissues, and a stable refraction effect of about 1.5 diopters is achieved at once; vision acuity improves to make 0.9-1.0.

[A phototopographic method of measuring the thickness of the cornea]. / Fototopograficheskii sposob izmereniia tolshchiny rogovitsy.

This method is based on asymmetric growth and distension of the cornea in various directions. One has just to ascertain the visual line projection site on the corneal surface and to measure the corneal thickness in but two points, in the centre and lower, near the limbus; then the thickness of the cornea at any site of the cornea may be calculated, for the cornea is the thinnest at sites where the limbus is the furthest from the centre. The accuracy of this method is not inferior to that of the known optic method.