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:: Volume 25, Issue 4 (Iranian Journal of Ophthalmology 2013) ::
2013, 25(4): 288-296 Back to browse issues page
Evaluation of the Impact of Intraocular Lens Tecnis Z9000 Misalignment on the Visual Quality Using the Optical Eye Modeling
Azam Asgari Dr. * , Ali Asghar Parach Dr., Keykhosro Keshavarzi Dr.
, aliparach@ssu.ac.ir
Abstract:   (4893 Views)

Purpose : The aim of this study was to investigate the effect of misalignment (tilt & decentration) of IOLs in cataract surgery using Liu-Brennan optical eye model in a simulation.

Methods : A phantom with the real eye parameters –Liu-Brennan model– and Tecnis Z9000 IOL were used for simulation.

Results : Results showed that with 0.4 mm decentration and more the modulation transfer function (MTF) and contrast were reduced continuously in the ±X Axes. IOL decentration in ±Y axes showed a symmetrical reduction of MTF and contrast with increasing the decentration. In the ±X and ±Y axes, 1º to 8º IOL tilts had no significant effect on the MTF and contrast of the eye.

Conclusion : It can be said that the decentration of Tecnis Z9000 IOL in the ±X and ±Y axes will reduce the optical quality of the person, specially for decentration more than 0.4 mm this effect is very significant. Therefore using the compensation methods for improvement of the optical quality is essential. But up to 8º IOL tilt in vertical and horizontal axes had no significant effect on the visual quality of the patient.

 

 Iranian Journal of Ophthalmology 201325(4):288-296 © 2013 by the Iranian Society of Ophthalmology

Keywords: Intraocular Lens, Misalignment, Tecnis Z9000, Zemax, Modulation Transfer Function, Optical Quality
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Type of Study: Original | Subject: Anterior segment
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Asgari A, Parach A A, Keshavarzi K. Evaluation of the Impact of Intraocular Lens Tecnis Z9000 Misalignment on the Visual Quality Using the Optical Eye Modeling. Iranian Journal of Ophthalmology. 2013; 25 (4) :288-296
URL: http://irjo.org/article-1-878-en.html


Volume 25, Issue 4 (Iranian Journal of Ophthalmology 2013) Back to browse issues page
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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