Visible vs infrared evaluation of diffractive multifocal intraocular lenses

Session Details

Session Title: Pseudophakic IOLs: Multifocal & Accommodative

Session Date/Time: Monday 07/09/2015 | 08:00-10:30

Paper Time: 08:48

Venue: Room 1

First Author: : F.Vega SPAIN

Co Author(s): :    F. Alba-Bueno   C. Varon   M. Gil   M. Millan           

Abstract Details

Purpose:

To compare the optical performance of diffractive multifocal intraocular lenses (MIOLs) with visible and infrared light, the latter being used in aberrometers and double-pass systems for objectively assessing the visual function of patients implanted with this type of MIOLs.

Setting:

Universitat Politècnica de Catalunya, Barcelona

Methods:

Two diffractive MIOLs of different design (Tecnis +2.75D ZKB00 and Restor +2.5D SV25T0) were tested in-vitro with both, visible (λ=530 nm) and infrared (λ=780 nm) light. For the two wavelengths, the energy efficiency and the Modulation Transfer Function (MTF) at the far and near foci of the MIOLs were obtained with pupils of 3.0 mm and 4.5 mm. The results of the MIOLs were compared to those obtained with two monofocal IOLs (Tecnis ZA9003 and Restor SN60WF) that share both, the aspheric design and material with their counterpart diffractive MIOL

Results:

With visible light, the two studied MIOLs generated relatively well contrasted images at their near and far foci. The energy efficiency of the foci was dependent on the particular design of the MIOLs. With IR light however, the energy efficiency of the far/near foci was significantly increased/reduced and thus, the MIOLs produced well contrasted images only at their far foci, especially in the case of the apodized SV25T0 MIOL with the largest pupil. The optical quality of the MIOLs' far focus with IR light, was close (ZKB00) or similar (SV25T0) to their counterpart monofocal IOLs

Conclusions:

In comparison with visible light, the optical performance of diffractive MIOLs with IR light is biased in favour of their far focus so they tend to optically behave as monofocal lenses particularly in the case of apodized MIOLs with large pupils. This may help clinicians to better understand the outcomes obtained with IR lighting based devices when analyzing patients implanted with diffractive MIOLs.

Financial Interest:

NONE