Since corneal thickness is changed by various corneal disease, it is important to determine the normal value of the corneal thickness. Normal corneal thickness was measured by Sohn (1972) in our depatment. Also it was reported by Murata and Kato (1963), von Bahr(1948) ,.that the corneal thickness is thinner in myopia than in emmetropia.
Author measured central corneal thickness of 58 myopic eyes which divided into three groups according to the degree of myopia-group 1(-0.25D?-3.75D), group 2(-4.0 D?-5.7.5D) and group 3(more than-6.0 D)-using Haag-Streit pachometer and Mishhna and Hedbys modified device to determine the changes of the corneal thickness of the myopic eyes.
Results obtained as follows:
1. In group 1, group 2 and group 3, the mean value with standard deviation for the central part of the cornea was 0.497±0.012mm, 0. 452±0. 011mm and 0.430±0.012mm, respectively.
2. There was no significant difference of the central corneal thickness between group 1 and emmetropia.
3. However central corneal thickness of the group 2 and 3 were significantly thinner than that of group 1, respectively (P4. The central corneal thickness was significantly thinner in group 3 than that of group 2 (P<0.001).
5. The changes of central corneal thickness linealy decreased as the myopic degree increased from -4. 0 D to -7. 0 D.
|