Abstract
Purpose :
To compare refractive results of a toric intraocular implant (HOYA® XY1A) after cataract surgery with or without Abulafia-Koch formula adjustment in the specific calculator of the implant (HOYA® V4)
Methods :
A retrospective case series. Eyes having cataract surgery with IOL toric implantation (XY1A HOYA®) calculated with the V4 HOYA® toric calculator were divided in two groups: with Abulafia-Koch formula adjustment in group 1, and without Abulafia-Koch formula in group 2. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), pre-operative corneal astigmatism, post-operative subjective total astigmatism, post-operative rotation, and predictive error in residual astigmatism were compared between the two groups.
Results :
53 eyes were included. Groups were comparable regarding axial length, pre-operative corneal astigmatism, and post-operative IOL rotation. UDVA was 0.07 +/-0.02 log MAR in group 1 and 0.13+/-0.02 log MAR in group 2 (p=0.08). Residual refractive astigmatism was not significantly different between the 2 groups, 0.23+/-0.05 D in group 1 and 0.35+/-0.07 D in group 2 (p=0.2), respectively. Sphere equivalent was significantly better in group 1, 0.07+/-0.06 D than in group 2, -0.36+/-0.12 D (p=0.001) Posterior corneal astigmatism estimated by Abulafia-Koch formula gave a better predictability of residual postoperative astigmatism with the V4 HOYA® calculator. Predictive error, defined as the difference between the residual cylinder estimated by V4 HOYA® calculator and the residual post-operative subjective cylinder, was better in group 1, 0.07 +/-0.06 D (p=0.22) than in group 2, 0.25 +/-0.07 D (p=0.03).
Conclusions :
Our study suggests that spherical equivalent and predictability of postoperative residual cylinder are significantly improved when the total corneal astigmatism is estimated by the Abulafia-Koch formula associated with V4 HOYA® calculator.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.