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New map settings to facilitate preoperative and postoperative laser refractive surgery evaluation and keratoconus diagnosis

Session Details

Session Title: Refractive
Session Date/Time: Sunday 22/02/2015 | 08:30-11:00
Paper Time: 09:30
Venue: Sadirvan A
First Author: : C.ARCE BRAZIL
Co Author(s): :    A. Dos Santos Forseto   G. Pilau           

Abstract Details

Purpose:

To show why the traditional composition of only four maps is presently insufficient for an earlier diagnosis of keratoconus or for an appropriate and complete preoperative and postoperative study of corneas going to refractive surgery. Ten maps were selected as the more valuable from the more than 19 available curvature, elevation, pachymetry, and wavefront maps shown in a system that combines dual Scheimpflug tomography and Placido topography.

Setting:

BOS-Eye Bank of Sorocaba, Sao Paulo, Brazil and Private Eye Clinic, Sousas, Campinas, Sao Paulo, Brazil

Methods:

Dual Scheimpflug tomography and Placido topography was performed in normal corneas that successfully went to refractive surgery, corneas with suspected initial keratoconus and/or risk factors of postoperative ectasia that were rejected for surgery and corneas with established diagnosis of keratoconus. Maps and settings were selected for each parameter studied: curvature, elevation, pachymetry and wavefront.

Results:

The traditional composition of four maps: anterior axial curvature, pachymetry, anterior and posterior BFS is insufficient for an early diagnosis of keratoconus because it does not show new indices and patterns recently proven to be useful for preoperative evaluation of refractive surgery. From more than 19 available maps we choose 10 maps: anterior and posterior axial curvature, anterior tangential curvature, anterior and posterior BFS and BFTA elevation maps, pachymetry, total corneal coma and total corneal power maps. Fixing a guide value in the yellow step of a particular scale for each map was based in the intuitive meaning of colors.

Conclusions:

We present a suggestion of maps, scales and settings that made easier and faster the evaluation of corneas going to laser refractive surgery, the diagnosis of keratoconus, and the study and detection of postoperative complications like the recognition of initial ectasia or a misalignment of treatment.

Financial Disclosure:

One or more of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, One or more of the authors travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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