ESCRS - PP13.04 - Intraocular Lens Power Calculations In Eyes With Shallow Anterior Chamber Depth And Normal Axial Length

Intraocular Lens Power Calculations In Eyes With Shallow Anterior Chamber Depth And Normal Axial Length

Published 2022 - 40th Congress of the ESCRS

Reference: PP13.04 | Type: ESCRS 2022 - Posters | DOI: 10.82333/gkfw-ah62

Authors: Yunjin Lee* 1 , Seonghwan Kim 1 , Joo Youn Oh 1 , Hyuk Jin Choi 1 , Mee Kum KIm 1 , , Chang Ho Yoon 1

1Ophthalmology,Seoul National University Hospital,Seoul,Korea, Republic Of

Purpose

To compare refractive outcomes after cataract surgery in eyes with shallow anterior chamber depth (ACD) and normal axial length (AXL) to control eyes, and to investigate the accuracy of 3 intraocular lens (IOL) calculation formulas in these eyes.

Setting

A retrospective chart review was performed in patients who underwent uncomplicated cataract surgery with Tecnis ® 1-piece monofocal IOL, Model ZCB00 at Seoul National University Hospital, between November 2019 and December 2021. All surgeries were performed using Centurion® Vision System (Alcon laboratories, Inc., Fort Worth, TX, USA).

Methods

Shallow ACD was defined as ACD <2.5 mm and normal AXL as 22.5 mm ≤ AXL <24.0 mm. Control group was set to normal AXL with 3.0 mm ≤ ACD <3.5 mm. Preoperative AXL, ACD, and lens thickness were measured with IOL master 700. Refractive prediction error (PRE) and mean absolute error (MAE) were evaluated with SRK/T, Barrett Universal II (Barrett II), and Kane formulas. The percentage of eyes within a certain range of prediction errors were also evaluated.

Results

We analyzed 35 shallow ACD eyes and 65 control eyes. Compared with the control group, PRE in the shallow ACD group showed hyperopic shift in Barrett II and Kane formulas but not in SRK/T formula (P<0.05, independent t test). Within the shallow ACD group, PRE showed hyperopic shift in Barrett II and Kane formulas than in SRK/T formula (P<0.05, One-way ANOVA with Tukey’s post hoc test). MAE was significantly higher in Barrett II formula compared with SRK/T formula (P<0.05, Friedman test with Dunn’s post hoc test). The percentages of eyes within ± 0.25 D, ± 0.5 D, ± 1.0 D and ± 2.0 D were not significantly different among the three formulas using Cochran Q test (all p > 0.05) in both normal and shallow ACD groups.

Conclusions

In eyes with shallow ACD and normal AL, preoperative predicted IOL power showed a tendency to be hyperopic with Barrett II and Kane formulas. The SRK/T formula is preferred over the others in these eyes.