Posters

Effect of novel non-penetrating opposite clear corneal incision on corneal astigmatism and biomechanical properties during phacoemulsification

Poster Details

First Author: N. Shah INDIA

Co Author(s):    D. Braganza   P. Subbaiah                 

Abstract Details

Purpose:

To analyze the outcomes in correction of pre-existing astigmatism and biomechanical properties using Non penetrating OCCI (opposite clear corneal incision) in comparison to conventional Penetrating OCCI.

Setting:

Tertiary eye care centre in Banglore, India

Methods:

Thirty one patients with against the rule astigmatism with more than 1.0 D were randomized into two groups. All patients underwent uneventful clear corneal phacoemulsification on steep axis [which was measured by Pentacam and correlated with IOL master] using 2.8mm keratome. In Group A (16 patient) Conventional OCCI was made using 2.8mm keratome. In Group B (15 patients) biplanar non penetrating OCCI without anterior chamber entry was made. BCVA, pentacam and corvis were recorded for all patients pre-operatively and 1 month post-operatively.

Results:

In group A, mean pre-operative astigmatism was 1.5(+/-0.7SD) which reduced to 0.6(+/-0.25SD) post -operatively. In group B pre-operative mean astigmatism was 1.4 D (+/-0.3SD) which decreased to 0.7(+/-0.2SD) post-operatively. Mean surgically induced astigmatism was 0.25(+/-0.3), measured by vector analysis. Post-operatively in group A , 9 patients had deformation amplitude of more than 1.2 and in group B ,5 patients had more than 1.2 ,p=0.01 i.e it is statistically significant. There was no difference in best corrected visual acuity between the groups.

Conclusions:

There was statistically significant comparable reduction in astigmatism post surgery in group A and group B. However this Novel technique of Non penetrating OCCI has an edge over conventional OCCI due to the benefits of better retention of biomechanical properties of the cornea.

Financial Disclosure:

NONE