J Korean Ophthalmol Soc.  1991 Oct;32(10):855-863.

Myopic Correction in Radial Keratotomy According to the Size of Central Optical Zone and Incision Length

• Park MH
• Kim JH

Abstract

We performed eight radial line cuts in anterior radial keratotomy(RK) employing the Russian style and the American style incisions on 103 eyes from August/ 1989 to March/ 1990. To analyze the results of myopic correction according to the size of the central optical zone and the incision length in RK, we chose the central optical zone size according to the degree of myopia (4.0 mm from -1.50D to -2.75D, 3.5mm from -30D to -3.75D and 3.0mm above -4.0D) and measured the length of each of the eight radial incisions of the cornea. The results were as follows: 1. In determining the average length of each corneal incision in RK, the longest was the superior and superior-nasal incision and the shortest was the temporal and inferior-temporal incision, regardless of the central optical zone size. 2. The total length of each of the eight incisions in each eye ranged from the longest at 3.0mm of central optical zone and the shortest at 4.0mm of central optical zone Undoubtedly, total incision length affected clinical results not significantly (p>0.05). 3. Assessing the clinical effect of myopic correction according to the optical zone size, smaller diameter clear zones produce a greater flattening of the cornea than larger ones. 4. The clinical result was not significantly affected by the direction of the incision (p>0.05).

Keyword

Radial keratotomy; Central optical zone; Incision length

MeSH Terms

Cornea
Keratotomy, Radial*
Myopia