Evaluation of intraocular lens glare or positive dysphotopsia type photic phenomena in both large and small pupils in a schematic model eye

Session Details

Session Title: Presented Poster Session: Combined Cataract Surgery & Cataract Surgery Complications

Venue: Poster Village: Pod 1

First Author: : L.Werner USA

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

Abstract Details

Purpose:

To evaluate glare or positive dysphotopsia type photic phenomena for Clareon CNA0T0 and other commonly used monofocal intraocular lenses (IOLs) in a schematic model eye at both large (5 mm) and small (3 mm) pupils. To assess how these types of phenomena can be affected by the edge profile, truncated optic and peripheral optic geometry of the different IOL types as well as size of the pupils.

Setting:

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

Methods:

Six monofocal IOL models (Alcon Clareon CNA0T0, AMO Tecnis ZCB00, Zeiss CT Lucia 601PY, B&L enVista MX60, Santen Eternity W-60 and Hoya Vivinex XY1) were used to evaluate glare or positive dysphotopsia type photic phenomena in a schematic model eye. All +25 D IOLs were used to create lens models based on high-resolution images and direct measurements. Non-sequential optical ray trace simulations of incoming light for each model were generated based on a collimated light source with a wavelength of 550 nm for various off-axis angles of illumination both at large and small pupil sizes.

Results:

Simulations showed that at 5 mm pupil, the CNA0T0 IOL produced focused off-axis images compared to all other IOL types. The ZCB00, 601PY, and MX60 IOLs produced dispersed images along with marked glare characteristics, likely because of reduced usable optic diameter and peripheral non-imaging optic geometry. The W-60 IOL showed the highest edge reflected glare characteristic, likely because of its straight optic edge geometry. The XY1 IOL produced a focused image, but with some edge transmitted glare at higher off-axis angles of illumination. At 3 mm pupil, ZCB00 demonstrated a noticeable glare for large off-axis angles of illumination.

Conclusions:

Non-sequential ray trace evaluations in a schematic model eye show that Clareon IOL design with full 6 mm optics and precision edge curvature demonstrated the lowest level or absence of glare over a wide range of incident angles at both mesopic and photopic pupil sizes. IOLs with peripheral non-imaging optic geometry and straight edge profiles may contribute to glare or positive dysphotopsia type photic phenomena. Future clinical studies can confirm if the differences from the model eye based simulations are clinically significant.

Financial Disclosure:

... is employed by a for-profit company with an interest in the subject of the presentation, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented