Posters

Model eye and in vitro assessment of positive dysphotopsia or glare types photic phenomena: a comparison of a new material IOL to other monofocal intraocular lenses

Poster Details

First Author: L.Werner USA

Co Author(s):    K. Das   S. Collins   X. Hong              

Abstract Details

Purpose:

This study compared the glare or positive dysphotopsia type photic phenomena for a new material IOL to other monofocal intraocular lenses (IOLs). These types of phenomena can be affected by the edge profile, and peripheral optic geometry of the IOL. We employed both non-sequential ray trace simulations in a schematic model eye and in vitro optical bench measurement methods to evaluate these photic phenomena.

Setting:

Alcon Laboratories, Inc., Fort Worth, Texas; John A Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.

Methods:

Five monofocal IOL models (Alcon Clareon SY60WF, AMO Tecnis ZCB00, B&L enVista MX60, Santen Eternity W-60 and Hoya Vivinex XY1) were used to evaluate positive dysphotopsia and glare-type phenomena. Optical ray trace simulations of incoming light were generated based on a collimated light source with a wavelength of 550 nm for various off-axis angle of illumination. The simulation analyses were verified using a laboratory glare bench-top measurement system, whereby off-axis glare characteristics are formed from illumination of IOLs at various angles.

Results:

The laboratory bench images and glare intensity profiles were consistent with the model eye simulation data. Results from non-sequential ray trace model eye simulations showed that Clareon SY60WF and Vivinex XY1 IOLs produced a focused off-axis images and negligible peripheral glare characteristics. Whereas, the Tecnis ZCB00 and enVista MX60 IOLs produced dispersed images along with marked glare characteristics at 45 degrees of off-axis illumination and above. The Eternity W-60 IOL showed the highest edge reflected glare characteristic, likely because of its sharp edge geometry. The laboratory bench images and glare intensity profiles were consistent with the model eye simulation data.

Conclusions:

This study found that both in vitro and non-sequential ray trace evaluations in a model eye showed that the sharp edge with peripheral optic geometry of an IOL may contribute to glare or positive dysphotopsia types photic phenomena. Lenses with modified anterior edge curvature and full optic profile without peripheral design features demonstrated the lowest level or absence of glare over a wide range of incident angles. Only clinical studies can confirm if the differences among the lenses found in vitro are clinically significant.

Financial Disclosure:

is employed by a for-profit company with an interest in the subject of the presentation