The Effect of Ciliary Muscular Constrictors and Dilators on Corneal Topography

Kim, Sun Wook; Jin, Kyung Hyun; Kim, Jae Myung

Abstract

We studied to know the effect of the ciliary muscular constrictors and dilators on corneal topography in 137 eyes of 87 patients, ranged from age 16 to 67. This study was based on the hypothesis that a dilator is used to reduce the tension of the scleral spur by relaxing the ciliary muscle and it casused to reduce the corneal power by increasing the corneal limbus diameter, and tha the constrictor decrease the corneal limbus diameter while it increased the power. Accordin to our compariosn of the radius & power on corneal topography and the changes of the intraocular pressure (IOP) before and 30 minutes after applying the eye drops (constrictors 51 eyes, dilators 60 eyes, balanced salt solution 25 eyes), there was no significant difference between the eyes before and after applying the eye drops (p>0.05). Also, there was no statistical change to the control group. We could not find any special changes comparing the constrictor and the dilator. Also the change in the physiologic range of IOP could not change the corneal refractive state significantly. We concluded that pupillary constriction and pupillary dialtation 30 minutes after applying the eye drops such as in the ciliary muscular constrictors & dilators, as is often done in outpatient department, do not make any change in the corneal shape.