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