Official ESCRS | European Society of Cataract & Refractive Surgeons


The accuracy of AL-Scan® for ocular biometry before cataract surgery and postoperative astigmatism in tilted disc syndrome patients

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Session Details

Session Title: Moderated Poster Session: A Bouquet of Topics

Venue: Poster Village: Pod 2

First Author: : H.Kim SOUTH KOREA

Co Author(s): :    T. Moon   J. Kim   H. Lee                 

Abstract Details


The purpose of this study was to evaluate the accuracy of preoperative ocular biometry using AL-Scan® in patients with tilted disc syndrome(TDS) patients and the effect of retinal status on TDS patients on postoperative total astigmatism.


We retrospectively reviewed the medical records of 14 eyes with TDS who underwent cataract surgery between January 2015 and May 2018. 14 eyes of cataract patients who underwent cataract surgery without any other eye disease, 13 eyes of cataract patients who underwent cataract surgery with staphyloma were selected.


We compared the refractive power measured by pre-operative ocular biometry using AL-Scan® and the refractive power measured by one-month refractive examination after cataract surgery. We also assessed whether there was retinal factor affecting astigmatism in TDS patients by comparing the total astigmatism with corneal astigmatism after assuming the absence of lenticular astigmatism through cataract surgery in each patient group. Astigmatism comparisons were made using vector analysis (Jackson coefficients J0, J45).


The mean absolute error of the predicted values of the SRK / II (1.31 ± 1.21 D) was inaccurate in comparison with the SRK / T, HofferQ, Haigis and Holladay1 formulas (p<0.05) and Haigis formula (0.44 ± 0.36) showed the highest accuracy. The mean absolute refraction error was no difference between TDS group and other two groups. The difference of postoperative astigmatism in TDS group was (J0, J45) = (0.28, 0.46), in staphyloma group was (J0, J45) = (0.12, 0.016) and in normal group was (J0, J45) = (0.28, 0.34). There was no statistically significant difference among the each groups(p=0.026).


The Haigis formula showed the highest accuracy in cataract surgery in patients with tilted disc syndrome, and no difference in prediction of refractive power between tilted disc syndrome group and the other group after cataract surgery. And there was no significant difference in postoperative total astigmatism and corneal astigmatism in every group. The amount of difference in postoperative total astigmatism and corneal astigmatism is not statistically significant. So, retinal factor affecting total astigmatism may not be considered in cataract surgery.

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