Safety topographic parameters for LASIK surgery with Pentacam®

Abstract

 

Purpose

 

Describe security topographic patterns with Pentacam to select candidates for LASIK surgery and prevent post-LASIK ectasia development.

 

Methods

 

Literature review of 50 articles from 2003 to 2013 of major ophthalmic journals, obtained from PubMed, Ovid, Medline and Trip database.

 

Results

 

The evaluation of pachymetric and elevation maps plays an important role to discriminate between normal and ectatic corneas, where the posterior elevation map had the greatest predictive value. The combination in the analysis of the maps in the module Belin Ambrosio, with improved best-fit sphere (BEST) and the index of pachymetric progression, allows an early detection of ectasia and finally the module that evaluates keratoconus index enables to assess the status of the corneal surface, highlighting its greater specificity for detecting ectasia the keratoconus index (K1), keratoconus central index (CK1) asymmetry on elevation index (IHA) and the offset by elevation index (IHD).

 

Conclusions

 

Pentacam® is a unique imaging system that uses a rotating Scheimpflug camera, providing greater precision. This procedure allows the evaluation of elevation maps in different modules for early detection of ectasia and appropriate selection of patients eligible for LASIK surgery.

 

Keywords: 733 topography • 574 keratoconus • 551 imaging/image analysis: non-clinical