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Scotopic pupil diameter assessment by swept-source anterior segment optical coherence tomography and its relationship with the optical zone in eyes implanted with the latest model of phakic collamer intraocular lens with central hole

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First Author: F.Gonzalez-Lopez SPAIN

Co Author(s):    C. Bouza-Miguens   V. Tejerina   R. Bilbao-Calabuig   B. Mompean           

Abstract Details

Purpose:

To assess the relationship between the scotopic pupil diameter and the size of the optical zone in eyes implanted with phakic collamer intraocular lens (pIOL) with central hole for correction of myopia (Visian ICL EVO/EVO+ models). The EVO+ model design has an enlarged optical zone.

Setting:

Clinica Baviera. Madrid. Spain.

Methods:

A modified commercially available swept-source anterior-segment optical coherence tomography (OCT) was used for performing dynamic pupillometry imaging at three months postoperatively. OCT-frames were manually chosen when the pupil reached its maximum size in a darkness ambient (0.5 lux). Subsequently the images acquired were processed, and pupil size at the iris plane was measured in all of them, collecting data whether the scotopic pupils exceeded the optic zones of the pIOLs.

Results:

This study comprised 50 consecutive eyes of 27 patients who underwent uneventful implantation of 38 spherical and 12 toric myopic pIOLs with central hole. Preoperative mean age of patients was 33±8 years with a spherical equivalent of -8.91±3.29 diopters. Three months postoperatively, mean pupil size under scotopic light conditions was 5.93±0.82mm. Twenty-eight eyes (56%) exceeded the pIOL optical zone by more than 0.2mm. In 75% (21 eyes) the optical zone was exceeded both on the temporal and nasal sides. The rest of the eyes (7 eyes) did it only on the nasal side.

Conclusions:

Pupil diameter in scotopic ambient light conditions exceed the optical zone of the pIOL in eyes implanted with the latest version of Visian ICL in more than half of the cases in a in a sample of myopic population. Preoperatively patients should be warned of the possibility of halos for this reason.

Financial Disclosure:

... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented