Posters

Differences between the estimated and Scheimpflug image measured axial intraocular lens positions and their relation to refractive error after cataract surgery

Poster Details

First Author: G.Nemeth HUNGARY

Co Author(s):    L. Modis   Z. Hassan   E. Szalai   A. Berta     

Abstract Details

Purpose:

To analyze differences between the SRK/T formula estimated and postoperatively measured anterior chamber depths (ACDs) using Scheimpflug imaging and assess the relationship between this difference and the postoperative subjective refractive error.

Setting:

Department of Ophthalmology, University of Debrecen and Orbi-Dent Health and Laser Center, Debrecen, Hungary

Methods:

The inclusion criteria were uneventful cataract surgeries. The SRK/T formula's estimated effective lens position (ELP) was calculated. The ACD was measured with a Pentacam HR preoperatively and a minimum of eight weeks postoperatively, at which the errors between the planned and achieved subjective refraction were also recorded.

Results:

102 eyes of 102 patients (age range: 36.2-87.5 years) were enrolled in our study with an axial length (AL) between 21.46-27.04 mm. The subjective refraction error was zero in 70 eyes, 0.25 D or 0.5 D in 21 eyes, and more, than 0.5 D error was present in 11 eyes. The correlation between the AL and preoperative measured and formula estimated preoperative ELP was significant (r=0.31, p<0.001; r=0.56, p<0.001). The correlation was not significant between the AL and the ACD estimation error (r=-0.12, p=0.21) or between the AL and subjective refraction error (r=0.09, p=0.37). The higher the postoperative measured ACD, the higher the ACD estimation error (r=0.81, p<0.05). The correlation between the ACD estimation error and the subjectively measured refraction error was not significant (r=0.12, p=0.26).

Conclusions:

The prediction error of the ELP can move within a broad range without influencing the subjective postoperative refractive result after the implantation of the IOL. FINANCIAL INTEREST: NONE