Posters

Optical quality of intraocular lens material following 10 to 30 years after implantation: a post-explantation pilot investigation study

Poster Details

First Author: K.Mena Guevara SPAIN

Co Author(s):    F. D'Oria   F. Toto   A. Arias   R. Duarte   P. Artal   J. Alio     

Abstract Details

Purpose:

The main objective of this work is to study the long-term IOL material degradation and the consequent loss of optical quality with time

Setting:

1. Division of Ophthalmology, Miguel Hernandez University, Alicante, Spain. 2. VISSUM Miranza, Alicante, Spain. 3. Section of Ophthalmology, Department of Basic Medical Science, Neuroscience and Sense Organs, University of Bari, Bari, Italy. 4. Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain. 5. Ocular Diopter Node, OFTARED - RETICS,Spain.

Methods:

IOLs of different materials that have been implanted from 10 to 30 years in human eyes and have been explanted by causes beyond the loss of transparency were studied. Dark field pictures of the IOLs were recorded to evaluate their opacities. The straylight parameter as function of the retinal eccentricity angle was assessed and images through the lenses of the USAF target were acquired.

Results:

The explanted lenses presented increased values of straylight when compared to a new reference lens. All the studied implanted lenses presented an amount of straylight superior to that occurring in the reference old observer (CIE). The amount of straylight produced by the IOLs at 3.5 degrees increases as the time since its implantation (t) increases, and it can be described by the exponential relationship s=A.exp(B.t), where the A and B constants are equal to 0.376 sr-1deg2 and 0.127. No correlation was found between the loss of spatial resolution in the test images and the straylight value for each IOL.

Conclusions:

The studied explanted transparent IOLs showed a moderate increase in straylight when compared to a new lens, that is correlated with the time the lens was implanted in the eyes. Despite the increment, the optical quality of the explanted IOLs was still reasonably good. The results indicate deterioration of IOLs optical quality through time that might be very important for the future development of intraocular lenses and the technology and industry of the sector.

Financial Disclosure:

None