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IOL calculation in very small eyes

Session Details

Session Title: Biometry

Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30

Paper Time: 08:12

Venue: Elicium 2 (First Floor)

First Author: : J.Villada THE NETHERLANDS

Co Author(s): :    J. Martinez de Aragon   T. Villada           

Abstract Details

Purpose:

To review the performance of the most currently IOL calculation formulae in eyes with axial length shorter than 20 millimetres.

Setting:

Ophthalmic Private Institution across Europe

Methods:

All eyes undergoing lens surgery with an axial length (AL) smaller than 20 millimetres since the year 2008 were initially included in the study. Only cases with highly reliable immersion biometry (SD of AL and anterior chamber measurements <0,1 and adequate graphs) were included in the study. Back calculation with Haigis, Holladay1, Holladay2, SRK/T and Hoffer-Q formulae was performed. The predicted result with the already used IOL for each formulae was compared with the obtained result.

Results:

One hundred and forty seven eyes were included in the study. The mean errors (difference between predicted and obtained result) were 0,2 ±1,09 for the Haigis formula, -0,27±1,07 for the Holladay1 formula, 0,42±1,07 for the Hoffer Q formula, 0,47±0,97 for the Holladay2 formula and -0,76±1,15 for the SRK/T formula. All the differences between the different formula’s errors were statistically significant except for the comparison between Holliday1 and Hoffer-Q. The Haigis formula also had the highest percentage of eyes within ±0,25 (24,5%), ±0,5 (42,18%) and ±1 diopters (69,38%) of the planned refraction of all formulae. However the percentage of eyes within ±0,25, ±0,5 and ±1 diopters was only statistically significant when comparing the SRK/T formula with any of the other formulae.

Conclusions:

The Haigis formula had the best performance of all tested formulae when calculating in very small eyes. However, these very small eyes remain one of the biggest challenges in IOL calculations

Financial Interest:

NONE