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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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

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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


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


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


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.


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.


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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