Optical quality comparison of six diffractive multifocal intraocular lenses: role of lens add power and foci light distribution

Session Details

Session Title: Presented Poster Session: Pseudophakic IOLs

Session Date/Time: Tuesday 08/09/2015 | 09:30-11:00

Paper Time: 10:20

Venue: Poster Village: Pod 3

First Author: : J.Gil SPAIN

Co Author(s): :    F. Vega   M. Varon   G. Cardona   F. Alba   M. Millan   J. Buil

Abstract Details

Purpose:

To compare the optical quality of six different multifocal intraocular lens (MIOL) designs (AcrySof ReSTOR SV25T0; AT LISA 809M; AT LISA TRI 839MP; Tecnis ZKB00; Tecnis ZLB00 and Tecnis Symfony ZXR00) as a function of light energy distribution and lens addition.

Setting:

Research facilities of the Group of Applied Optics & Image Processing, Department of Optics and Optometry, Technical University of Catalonia-BARCELONA TECH, Terrassa, Spain.

Methods:

A modified-ISO eye model was used for in-vitro testing of the lenses. The experiments were carried out with pupil sizes of 3.0 mm (simulating photopic conditions) and 4.5 mm (mesopic conditions). Light distribution at the foci of the MIOLs was experimentally determined from image analysis. The optical quality of the MIOLs was derived from the value of the modulation transfer function (MTF) at the best focus planes and through-focus MTF curves (at 50 cycles/mm). Results were compared among the MIOLs and to a reference monofocal IOL (ReSTOR SN60WF).

Results:

Light distribution at each focus was found to be influenced by lens design and add power. With a 3 mm pupil, the best optical quality at distance was achieved by the ReSTOR SV25T0 (MTF score of 0.40). The other MIOLs obtained a similar MTF score (approximately 0.25). At intermediate distances (between 60 and 80 cm), the Symfony MIOL showed the best quality (almost 0.40), followed by the AT LISA TRI 839MP (score 0.10). MTF values with the other lens designs were poor. The best optical quality at the near focus corresponded to the ZLB00 and ZKB00 (scores of 0.3).

Conclusions:

In diffractive MIOLs, lens design is determinant of light distribution at each lens foci. Apodized designs provide more light energy to the distant focus, while undermining light reaching the near focus. The extended focus design provided by the Symfony lens offers the best performance at intermediate distances, when compared with the other MIOLs under study. Particular care must be exercised when comparing optical quality at predetermined constant distances between lens designs with different add powers.

Financial Interest:

NONE