Posters

A standard low toric IOL for eyes with no or low astigmatism

Poster Details

First Author: O.Reitblat ISRAEL

Co Author(s):    A. Levy   G. Kleinmann   E. Assia              

Abstract Details

Purpose:

To evaluate the theoretical visual outcomes following a simulated implantation of a standard 0.75 diopters (D) toric intraocular lens (IOL) in eyes with low or no astigmatism, which would usually not be implanted with a toric lens.

Setting:

Ein Tal Eye Center, Tel Aviv, Israel.

Methods:

Consecutive cases of eyes, that had undergone cataract surgery with an implantation of one model of hydrophilic multifocal IOL by a single surgeon, were enrolled. Based on the postoperative residual astigmatism, a low toric correction of 0.75 D was applied in all cases using the meridional analysis method. An algorithm for an automated selection of the optimal axis of implantation for the cylinder correction of 0.75 D was developed. Simulated residual refraction was calculated for the theoretical toric IOL for each eye. The results were compared with actual residual astigmatism measured at the subjective refraction examination.

Results:

Data from 100 eyes were evaluated. Implantation of the 0.75 D toric IOLs led to a lower median absolute residual astigmatism and a lower mean centroid residual astigmatism compared with the non-toric IOLs (0.24 D vs. 0.50 D, P < .001 and 0.05 D @ 4° vs. 0.30 D @ 13°, P < .001 [x-axis], P < .001 [y-axis], respectively). The percentage of eyes with a clinically significant residual astigmatism (> 0.75 D) was reduced from 19% to 3% with the application of the 0.75 D toric IOL (P = .006).

Conclusions:

Our simulation suggests that implantation of a standard 0.75 D toric IOL may yield reductions in the residual cylinder achieved with the non-toric IOL. The low power toric lens may reduce the overall low pre-existing astigmatism and the surgically induced astigmatism. Adopting this lens as a routine practice may further contribute to modern cataract surgery results.

Financial Disclosure:

None