The Effect of Capsular Tension Ring on Anterior Capsular Opening and Intraocular Lens in Cataract Surgery

ABSTRACT

The effect of capsular tension ring[CTR]on prevention of contraction of capsular opening induced by continuous curvilinear capsulorhexis in cataract surgery has been evaluated. In this study, we performed cataract surgery on 15 patients[23 eyes]in Group I[IOL implantation with CTR] and 13 patients[24 eyes]in Group II[IOL implantation without CTR]from September 1998 to November 1998. We compared uncorrected visual acuity[UCVA], spherical equivalent[SE], astigmatism, size of capsular opening, IOL rotation and change of anterior chamber depth between two Groups. We used image analysis system to determine an actual size of capsular opening and measured a depth of anterior chamber than 5 times by using A-scan ultrasound. GroupIand IIshowed a similar pattern of change of UCVA, SE and astigmatism. Contraction rate of capsular opening 2 months after operation was 1.41%in Group Iand 3.95%in Group II. This difference was statistically significant [p<0.001].The anterior chamber depth increased temporarily in both groups, However, it was slightly decreased and maintained in Group I, while steadily decreased in Group II. Rotation of IOL was greater in Group IIthan Group I. However, it was not statistically significant. With these results it would be concluded that CTR might prevent a contraction of capsular opening and enhance a stability of IOL.