Posters

The actual optic corneal zone in patients with cataract and a history of radial keratotomy

Poster Details

First Author: O.Rozanova RUSSIA

Co Author(s):    E. Tsyrenzhapova                    

Abstract Details

Purpose:

to analyze the topography of actual optic corneal zone and to develop IOL selection criteria in patients with cataract and the history of radial keratotomy

Setting:

National Medical Center “S. Fyodorov Eye Microsurgery Federal State Institution”, Irkutsk Branch, Russia

Methods:

64 patients (128 eyes) with the history of radial keratotomy  were examined before cataract surgery (phacoemulsification with IOL implantation). The optical properties of the cornea were examined with the usage of Pentacam HR. The position and size of the actual optic corneal zone, the values of keratometry equivalent and cornea elevation (front and back in central 5 points) were analyzed.

Results:

The cornea profile had significant differences: front cornea elevation was -9.08±12.97µm (min -48.0; max 30.0); back cornea elevation was  -12.39±12.97 µm (min -67.0; max 75.0). The mix of positive and negative elevation profiles in 3.0 mm central zone was in 78 eyes (62%). The central corneal zone with the difference no more than 2.0 D among keratometry equivalent values in 4 paracentral points was only in 50 eyes (46%). The regular corneal astigmatism 2.0 D and more was in 42 eyes (33%). The irregularity of actual optic corneal zone was in 27 eyes (21%).

Conclusions:

The optical properties of the actual corneal zone in the patients with cataract and the history of radial keratotomy vary significantly. Back cornea parameters had a high contribution in cornea complexity. Standard approaches to IOL selection and calculation are possible only in 79% cases.

Financial Disclosure:

None