Razi Journal of Medical Sciences

 ABSTRACT

The purpose of this study was the evaluation of cycloplegic effect of homatropine 2% on central corneal curvature and power. 43 volunteers who participated in the study were examined. Thirty-nine of them (28 men and 11 women) which had normal eyes with visual acuity of 20/20 and a mean age of 29.6 ± 6.7 years were selected. Then corneal topography was performed on both eyes. After performing corneal topography, a drop of homatropine 2% was instilled 6 times (at 10 minute intervals) in one eye and the other was the control eye. One hour after the final instillation of homatropine 2%, we then repeated corneal topography on both eyes. Central corneal curvature and power were evaluated and compared in series of corneal topographies. After instillation of homatropine 2% eye drop, central corneal curvature increased by a mean of +0.13 ± 0.11mm and central corneal power decreased by a mean of 0.76 ± 0.14 diopter (corneal flattening). It seems that cycloplegic effect of homatropine 2% eye drop decreases traction on scleral spur and then central corneal curvature increases and central corneal power decreases.