Estudo comparativo entre sistemas videoceratográficos no ceratocone

Estudo comparativo entre sistemas videoceratográficos no ceratocone


Renato Leça,
Ana Luisa Hofling de Lima


Arquivos Brasileiros de Oftalmologia

versão impressa ISSN 0004-2749versão On-line ISSN 1678-2925

Arq. Bras. Oftalmol. vol.62 no.1 São Paulo fev. 1999



To compare the results obtained by the "Corneal Analysis System EyeSys'', a videoke ratoscopy based on the p rincipie of Plácido 's disk, and with those by the "Corneal Topography System PAR", a videokeratoscopy based on the principie of rasterestereography, in view of the analysis of eyes with keratoconus.


Prospective and comparative study of the videoke ratographic maps of 55 eyes with keratoconus of 32 patients obta ined by CAS Eye-Sys and by CTS PAR.


The CTS-PAR method measured larger areas of the cornea, a larger number of cases, located more superiorly the apexes and supplied slightly smaller curvatures than the CAS-EyeSys. On the other hand, the two methods did not dijfer regarding measures of the direction o.f ustigmatism and the keratometric dijfe rence.


The v ideokeratographyc methods based on Plácido's disk ( CAS EyeSys) and on rasteresterecgraphy (CTS PAR) presented severa[ discrepam results in the analysis of eyes with keratoconus.

Keywords: Keratoconus; Placido disc; Rasterestereography


1 Bechara SJ, Zanoto A, Jose N K. Precisão e reprodutibilidade da videoceratografia. Arq Bras 1996;59:601-7 .
2 . Belin M O , Cambier J L , Nabors JR PAR corneal topography system. Cornea 1994;13:339-44.
3 Belin MO, Zloty P. Accuracy of the PAR Corneal Topography System with spatial misalignment. CLAO J 1993;19:64-8 .
4 . Krachmer J H, Feder RS. Belin MW. Keratoconus and related noninflamatory corneal thinning disorders. Surv Ophthalmol 1984;28:293-322.
5 Litoff O, Belin MW, Winn SS, Smith RS. PAR Technology Corneal Topography System. Invest Ophthalmol Vis Sci 1991;32:922.
6 Varssano O, Luchs JI, Rapuano CJ. Comparision of keratometric values of healthy and diseased eyes measured by Javal keratometer, EyeSys and PARCTS. Invest Ophthalmol Vis Sci 1996;37:911 .
7 Wilson SE. Klyce SO. Advances in the analysis of corneal topography. Surv Ophthalmol 1991;35:269-77.
8 Yong JA, Talamo JH, Siegel IM. Contour resolution of the EyeSys Corneal Analysis System. J Cataract Refract Surg 1995;21:414-6.