Estudo comparativo entre sistemas videoceratográficos no ceratocone

Autores:

Renato Leça,

Ana Luisa Hofling de Lima

ARTIGO ORIGINAL

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

http://dx.doi.org/10.5935/0004-2749.19990050

SUMMARY

Purpose:

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.

Method:

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.

Results:

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.

Conclusion:

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

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REFERÊNCIAS

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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.

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