Abstract
Purpose :
To evaluate glare type photic phenomena for the new Clareon CNA0T0 and five other marketed intraocular lens (IOL) models using non-sequential ray trace simulations in a schematic model eye both at large (5 mm) and small (3 mm) pupils. To assess how these types of phenomena can be affected by the edge profile and peripheral optic geometry of the different IOL types as well as size of the pupils.
Methods :
Six monofocal IOL models (Alcon Clareon CNA0T0, AMO Tecnis ZCB00, Zeiss Ct Lucia 601 PY, B&L enVista MX60, Santen Eternity W-60 and Hoya Vivinex XY1) were used to evaluate glare type photic phenomena. Non-sequential optical ray trace simulations of incoming light for +25.0 D IOLs of 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 mesopic and photopic pupil sizes.
Results :
Non-sequential ray trace model eye simulations showed that at 5 mm pupil CNA0T0 IOL produced focused off-axis images compared to all other IOL types. The Tecnis ZCB00, Ct Lucia 601 PY, and enVista MX60 IOLs produced dispersed images along with marked glare characteristics at 45 degrees of off-axis illumination and above, likely because of reduced usable optic diameter and larger peripheral non-imaging optic geometry. The Eternity W-60 IOL showed the highest edge reflected glare characteristic, likely because of its straight optic edge geometry. The edge reflected glare for enVista MX60 also increased with higher off-axis illumination. Vivinex XY1 IOL produced a focused image but with some edge transmitted glare at higher off-axis illumination. The results also demonstrate that glare type photic phenomena are considerable at mesopic pupil size for ZCB00, and 601 PY IOLs. The glare appears to be noticeable at 3 mm pupil for large off-axis angles of illumination.
Conclusions :
IOLs with peripheral non-imaging optic geometry and straight edge profiles may contribute to glare type photic phenomena. IOL designs with full functional 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.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.