Posters

Third and fourth generation formulas for intraocular lens power calculation after implantable collamer lens implantation in high myopia

Poster Details

First Author: M.Amro LEBANON

Co Author(s):    E. Jarade   W. Chanbour                 

Abstract Details

Purpose:

To determine the effect of Visian Implantable Collamer Lens (ICL) implantation on biometric parameters and intraocular lens (IOL) power calculation

Setting:

Beirut Eye and ENT Specialist Hospital

Methods:

Methods: Setting: Institutional setting. Study population: Total of 12 patients. Observation procedure: The Zeiss IOLMaster 500 was used to measure biometry parameters and IOL power calculations before and 2 months after ICL implantation. Main outcome measures: Axial length (AL), Keratometry values (K-values) and anterior chamber depth (ACD) were measured and compared. IOL power was calculated using third (3rd) generation (SRK/T, Holladay 1, Hoffer Q) and fourth (4th) generation formulas (Haigis and Barrett Universal II) and compared.

Results:

Pre-operative and post-operative AL were comparable (27.34 ± 1.51 mm vs.27.35 ± 1.59 mm, P=0.91), same as K-values. The difference was significant between pre and post-op ACD (3.67 ± 0.46 mm vs.3.4 ± 0.56 mm, P=0.008).The average IOL power calculation showed a non-significant change using Haigis (10.04 ± 3.42 D vs.10.1 ± 3.59 D, P= 0.69); SRK/T (9.85 ± 3.41 D vs.9.94 ± 3.58 D, P=0.44); Holladay 1 (9.7 ± 3.47 D vs.9.8 ± 3.64 D, P=0.45); Hoffer Q (9.7 ± 3.4 D vs.9.85 ± 3.59, P=0.37) and Barrett Universal II (9.29 ± 3.52 D vs.9.35 ± 3.71 D, P=0.63).

Conclusions:

ICL implantation did not affect the IOL power prediction for high myopic and myopic astigmatism patients. There is no need to use a regression formula to predict the pre-op ACD from the post-op value. In those patients whose pre-op data is not available, the post-op values can be used in the IOL power calculation formulas

Financial Disclosure:

None