Comparison of different needle gauges and IOL haptic thickness for flanged haptics intrascleral IOL fixation technique

Session Details

Session Title: IOL Dislocation & Opacification

Session Date/Time: Tuesday 25/09/2018 | 14:00-16:00

Paper Time: 14:54

Venue: Room A3, Podium 1

First Author: : B.Trindade BRAZIL

Co Author(s): :    G. Eliazar   C. Trindade   F. Trindade   D. William de Lima Monteiro           

Abstract Details

Purpose:

To determine the best combination of needle gauge and IOL haptic thickness to perform flanged haptics intrascleral IOL fixation.

Setting:

Medical Sciences Eye Institute - FELUMA Electrical Engineering Department of the Federal University of Minas Gerais

Methods:

Ten samples of four different-brand 27 and 30 gauge needles were evaluated under a laser perfilometer in order to determine the size of internal lumen, wall thickness and external diameter. Three 3-piece IOL models (AR40e®, ZA9003® and MA60AC®) were also evaluated using the same machine to measure their haptic thickness and roughness before and after haptic thermal deformation.

Results:

Mean 27-gauge needle internal lumen, wall thickness and outer diameter were, respectively, 211±12µm, 188±9µm and 420±21µm. For the 30-gauge models, these measures were, 163±9µm, 81±10µm and 312±11µm respectively. The differences between the 27 and 30 gauge needles were statistically significant (p<0.001) for all variables. Mean haptic thickness was 137µm (129 to 164µm) before deformation. Thermal deformation yielded a terminal haptic blob measuring 430µm (400 to 560µm). No difference was found between the three IOL model.

Conclusions:

Both analyzed needle gauges were able to accommodate IOL haptics in their inner lumen. Smaller 30-gauge-needle external diameter offer a more secure alternative for flanged haptics intrascleral IOL fixation.

Financial Disclosure:

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