Posters

Intra ocular lens selection based on pre-operative spherical aberration to achieve better corneal residual spherical aberration for best quality of image after cataract surgery

Poster Details

First Author: A.Nowrouzi SPAIN

Co Author(s):    J. Benitez-Del castillo   A. Lopez Jimenez   J. Lacorzana Rodriguez   M. Rodriguez Calzadilla   I. Pereira Gonzalez   M. Mota Chozas     

Abstract Details

Purpose:

To determine the level of residual spherical aberration that gives the best objective and subjective quality of image after cataract surgery with intraocular lens (IOL) implantation based on pre-operative spherical aberration of the cornea.

Setting:

Department of Ophthalmology, Hospital Jerez De la Frontera, Jerez De la Frontera, Cadiz, Spain.

Methods:

Consecutive cataract patients were examined using the Pentacam HR high-resolution rotating Scheimpflug camera (Oculus, Wetzlar, Germany). In one eye of each patient, the root-mean-square (RMS) of total corneal spherical aberration Z4(0) was calculated by ray-tracing on an area of 6 mm diameter in order to select the best intraocular lens (IOL) with spherical aberration range of -0.27 μm to +0.20 μm based on calculated final total postoperative spherical aberration of 0-0.10 μm considered to be the best compromise between subjective depth of focus and objective contrast sensitivity.

Results:

124 patients were evaluated (53 males and 71 females) with mean [±SD] age, 71.02 [±10.12] Years RMS mean of total cornea (±SD) values of Z4(0) were +0.294 (±0.121) μm. For postoperative targets of 0 ± 0.05/+0.10 ± 0.05 μm residual Z4(0), the proportion of eyes that would have qualified for implantation of negatively aspheric IOLs with up to -0.27 μm was (90.3% respectively; p = 0.09); significantly fewer eyes (9.6%) would have qualified for implantation of neutrally aspheric IOLs(p>0.05).

Conclusions:

In order to reach a final spherical aberration of zero to 0.10 μm obtained by compensation of IOL asphericity witch considered to be the best compromise between subjective depth of focus and objective contrast sensitivity in most patients, the implantation of commercially available negatively aspheric IOLs would partially compensate for the positive total corneal Z4(0). Fewer eyes would have qualified for implantation of neutrally aspheric IOLs. There is an essential demand to produce more negative aspherical IOLs to compensate corneal high positive spherical aberration in many patients in order to achieve the final spherical aberration of zero to 0.10 μm.

Financial Disclosure:

None