A technique of experimental and numerical analysis of influence of defects in the intraocular lens on the retinal image quality

Malwina Geniusz; Marek Zając

doi:10.1117/12.2238082

28 September 2016 A technique of experimental and numerical analysis of influence of defects in the intraocular lens on the retinal image quality

Malwina Geniusz, Marek Zając

Author Affiliations +

Proceedings Volume 9971, Applications of Digital Image Processing XXXIX; 997125 (2016) https://doi.org/10.1117/12.2238082
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

Intraocular lens (IOL) is an artificial lens implanted into the eye in order to restore correct vision after the removal of natural lens cloudy due to cataract. The IOL prolonged stay in the eyeball causes the creation of different changes on the surface and inside the implant mainly in form of small-size local defects such as vacuoles and calcium deposites. Their presence worsens the imaging properties of the eye mainly due to occurence of scattered light thus deteriorating the vision quality of patients after cataract surgery. It is very difficult to study influence the effects of these changes on image quality in real patients. To avoid these difficulties two other possibilities were chosen: the analysis of the image obtained in an optomechanical eye model with artificially aged IOL as well as numerical calculation of the image characteristics while the eye lens is burdened with adequately modeled defects. In experiments the optomechanical model of an eye consisting of a glass “cornea”, chamber filled with liquid where the IOL under investigation was inserted and a high resulution CCC detector serving as a “retina” was used. The Modulation Transfer Function (MTF) of such “eye” was evaluated on the basis of image of an edge. Experiments show that there is significant connection between ageing defects and decrease in MTF parameters. Numerical part was performed with a computer programme for optical imaging analysis (OpticStudio Professional, Zemax Professional from Radiant Zemax, LLC). On the basis of Atchison eye model with lens burdened with defects Modulation Transfer Functio was calculated. Particular parameters of defects used in a numerical model were based on own measurements. Numerical simulation also show significant connection between ageing defects and decrease of MTF parameters. With this technique the influence of types, density and distribution of local defect in the IOL on the retinal image quality can be evaluated quickly without the need of performing very difficult and even dangereous experiments on real human patients.

Citation Download Citation

Malwina Geniusz and Marek Zając "A technique of experimental and numerical analysis of influence of defects in the intraocular lens on the retinal image quality", Proc. SPIE 9971, Applications of Digital Image Processing XXXIX, 997125 (28 September 2016); https://doi.org/10.1117/12.2238082

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available