Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance
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10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits

 

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Straylight from explanted intraocular lenses

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Session Details

Session Title: Presented Poster Session: Monofocal IOL

Session Date/Time: Sunday 11/09/2016 | 09:30-11:00

Paper Time: 09:50

Venue: Poster Village: Pod 4

First Author: : G.Łabuz THE NETHERLANDS

Co Author(s): :    E. Papadatou   T. Van Den Berg   F. Vargas-Martin   N. Lopez-Gil   N. Reus  

Abstract Details

Purpose:

Several studies found that visual straylight does as a rule not return to the level normal for young eyes after cataract extraction and intraocular lens (IOL) implantation. Ten percent of pseudophakic patients suffer from disabilitating straylight elevation. The reason of the observed increase is unknown. Although it has been reported that scattering of a new IOL is low, this may change once the IOL is implanted in the eye. In the present study light scattering expressed in term of straylight of explanted IOLs was evaluated.

Setting:

Laboratory setting, Faculty of Optics and Optometry, University of Murcia, Murcia, Spain

Methods:

Six explanted IOLs were studied using a commercial straylight meter (C-Quant, Oculus) adapted for in-vitro analysis of scattering from IOLs. The IOLs were explanted for reasons other than straylight (e.g., subluxation). To study whether large or small (compared to wavelength) particles predominate in light scattering of the explanted IOLs, interference filters (IF) were used. This allowed analysis of the particles’ size by means of straylight-wavelength dependency. Because of the narrow bandwidth of the IFs (10 nm), a camera was used as light amplifier. This approach was evaluated by comparing results with and without camera use.

Results:

A good correspondence between the straylight measurements with and without camera use was found (R2=0.98). The mean ± SD (range) straylight of the explanted IOLs was 0.37 ±0.65 log(s) (-0.35 to 1.09 log(s)). As 3 of the analyzed IOLs showed very low straylight levels, they were excluded from spectral analysis. The spectral analysis of the other 3 IOLs showed rather weak spectral effects, much less than Rayleigh type scattering.

Conclusions:

Some of the explanted IOLs preserved their low scattering properties, but others showed increased straylight up to a level known to be of functional significance. This may result in elevated sensitivity to glare, and consequently lead to patient dissatisfaction. The processes involved may be missed in slit lamp evaluation. Particles larger than wavelength appear to dominate in the processes. More study is needed to elucidate the origin of these particles.

Financial Disclosure:

NONE

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