Posters

Comparison of the quality of vision and the effect of decentration in two aspheric posterior chamber intraocular lenses.

Poster Details

First Author: S.Adiga INDIA

Co Author(s):    A. Jain   K. Chandra   G. Gupta              

Abstract Details

Purpose:

To evaluate the quality of vision (measured by higher order aberrations HOA and contrast sensitivity) and effect of decentration with two aspheric posterior chamber intraocular lenses (IOL).

Setting:

Advanced Eye Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India.

Methods:

Patients with bilateral cataract were prospectively randomized to receive a Technis 1P (ZCB00) in one eye and Hoya Vivinex (XY1) in the other. A laser ray tracing aberrometer was used to evaluate the decentration and quality of vision from the modulation transfer function (MTF), visual Strehl ratio and higher order aberrations. Contrast sensitivity was measured using the functional visual analyser.

Results:

The study comprised 34 eyes of 17 patients. The mean of the visual internal strehl ratio was significantly higher (p<0.05) among Hoya Vivinex XY1 group at all pupil sizes. The internal HOAs were significantly more among Hoya Vivinex XY1 group at small pupil sizes (p=0.013 at 4mm pupil size). There is decline in internal Strehl ratio in both the IOL groups with increase in angle alpha, angle kappa, decentration from visual axis and geometric axis. There is statistically significant increase in the internal HOAs with decentration from geometric axis in XY1 group. The contrast sensitivity in both IOLs were comparable.

Conclusions:

The average quality of vision was better among Hoya Vivinex XY1 group. With decentration, there was more decline in the quality of vision in Hoya Vivinex XY1 as compared to Technis 1P which could be explained by the fact that Technis 1P was less prone to decentration due to its sturdy built design.

Financial Disclosure:

None