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Effect of pupil size and light conditions in monofocal intraocular lenses

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First Author: D.Tognetto ITALY

Co Author(s):    C. De Giacinto   R. Giglio   A. Alarcon   C. Canovas   B. Koopman   P. Piers     

Abstract Details

Purpose:

To evaluate the effect of pupil size in intermediate and distance performance in different monofocal intraocular lens (IOL) technologies with different levels of spherical and chromatic aberrations using optical bench data in green and white light conditions.

Setting:

Johnson and Johnson Surgical Vision, AMO Groningen, The Netherlands

Methods:

Optical image quality was evaluated using the modulation transfer function (MTF) and the phase transfer function measured in an optical bench in green and white light for 2, 3, 4 and 5 mm pupil with a corneal eye model that resembles the average chromatic and spherical aberration of the eye. Visual acuity (sVA) was simulated using the method described by Alarcon et al. BOE2016. A new aspheric monofocal IOL designed to improve intermediate vision and fully compensate for the average corneal spherical aberration (CSA) was compared to spherical and aspheric IOLs with a range of spherical and chromatic aberration values.

Results:

At distance, the aspheric IOL with partial CSA as well as the spherical IOL provided the largest pupil dependency with losses larger than 40% in MTF at 50c/mm in white light when increasing the pupil size from 3 to 5mm. The effect of the pupil size was magnified in green light. All aspheric monofocal IOLs maintained distance sVA for all pupil sizes (differences below 0.05logMAR respect to the 3mm condition) and were equally affected at intermediate. Therefore, relative improvement in intermediate of the new aspheric IOL as compared to other monofocal designs was maintained for all pupil sizes.

Conclusions:

The effect of pupil size in monofocal IOLs performance is affect by the image quality metric as well as light conditions. Distance MTF was mainly reduced for larger pupil sizes in monofocal IOLs that do not fully compensate for CSA. The effect of the different pupil sizes in distance and intermediate sVA was similar for all aspheric designs, including the new aspheric IOL. For that reason, the new aspheric monofocal IOL provides an improvement in intermediate sVA and maintained distance image quality when compared to that of an aspheric IOL independently of the pupil size.

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