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

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Session Details

Session Title: Presented Poster Session 03: Cataract Surgery Outcomes 2

Session Date/Time: Saturday 13/09/2014 | 09:30-11:00

Paper Time: 10:00

Venue: Pod 3 (Poster Village)

First Author: : G.Nemeth HUNGARY

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

Abstract Details


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.


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


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.


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).


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.

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