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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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Determining the potential role of crystalline lens rise in the decision-making process of lens sizing in phakic intraocular collamer lens surgery

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Session Details

Session Title: Phakic IOLs

Session Date/Time: Sunday 23/09/2018 | 08:00-10:00

Paper Time: 09:20

Venue: Room A3, Podium 1

First Author: : F.Gonzalez-Lopez SPAIN

Co Author(s): :    R. Bilbao-Calabuig   B. Mompean                 

Abstract Details


To assess the influence of the crystalline lens rise (CLR) in the postoperative vault in eyes implanted with a phakic collamer intraocular lens (pIOL) with a central port for the correction of myopia.


Clinica Baviera. Madrid. Spain.


Using a non-invasive Fourier-domain swept-source anterior segment optical coherence tomographer, we dynamically evaluated under changing light conditions the varying position of the pIOL optics and some featured anterior chamber landmarks. For each eye assessed, the following parameters were measured in maximum mydriasis and miosis: CLR, pIOL vault, anterior chamber depth (ACD), angle-to-angle distance and pupil size. The CLR rise is defined as the distance between the anterior pole of the crystalline lens and a line joining the 2 opposite iridocorneal angles along the horizontal corneal diameter (3 o’clock to 9 o’clock).


The study sample comprised 111 eyes (65 patients) implanted with a myopic pIOL. A significant difference in CLR was found when maximum and minimum pupil size were compared (p<.001). The sample was further divided into 4 groups according to CLR in miosis: Group 1: CLR <0; group 2: CLR 0-200 microns; group 3: CLR 201- 350 microns; group 4: CLR> 350 microns. We found significant differences (p<.01) in vault between groups 1-3, 1-4, 2-3, and 2-4. Eyes with a high vault value (>750 microns in mydriasis) had lower CLR values than eyes with low vault (<100 microns in miosis) (p<.001).


CLR varies significantly with the pupillary movements and differs significantly in eyes with high and low postoperative vault. CLR should be considered in the pIOL sizing calculation algorithms.

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