Compartilhar

Precisão e reprodutibilidade da videoceratografia

Precisão e reprodutibilidade da videoceratografia

Autores:

Samir Jacob Bechara,
Arnaldo Zanoto,
Newton Kara José

ARTIGO ORIGINAL

Arquivos Brasileiros de Oftalmologia

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

Arq. Bras. Oftalmol. vol.59 no.6 São Paulo dez. 1996

http://dx.doi.org/10.5935/0004-2749.19960009

SUMMARY

Accuracy and reproducibility of the EyeSys videokeratography system was evaluated on a plastic sphere (42.50 D) and on 58 corneas of 58 patients, divided into four groups: 30 normal corneas, 10 post radial keratotomy corneas, 8 post excimer laser corneas and 10 keratoconic corneas. A method including all measurement points in the accuracy and reproducibility analysis was used. The EyeSys system showed on the plastic sphere an accuracy of 95% of the measurements within 0.25 D and higher reproducibility levels on the central (mean 0.0295 D) than on the peripheral (mean 0. 0962 D) region. The normal, post radial keratotomy and post excimer laser corneas showed similar reproducibility levels on the central (means 0.1524 D, 0.1406 D, and 0,0962 D, respectively) and peripheral (means 0.4484 D, 0.4673 D and 0.3138 D, respectively) regions. In the Keratoconus reproducibility was lower than in the other groups (p < 0.05), both on the central (mean 0.3808 D) and peripheral (mean 0.8458 D) regions. In the four groups, reproducibility was significantly higher on the central cornea (p < 0.05). The EyeSys system seems to be able to provide useful clinical information about the corneal surface, particularly over its central region.

REFERÊNCIAS

1 KOCH, D. D.; FOULKS, G. N.; MORAN, C. T.; WAKIL, J. S. - The eyesys corneal analysis system: accuracy and reproducibility of firstgeneration prototype. Refract. Corneal. Surg., 5: 424-429, 1989.
2 BOGAN, S. J.; WARING, G. O. III; IBRAHIM, O.; DREWS, C.; CURTIS, L. - Classification of normal corneal topography based on computer-assisted videokeratography. Arch. Ophthalmol., 108: 945-949, 1990.
3 GRIMBERG, A. R. U. - Topografia corneana computadorizada no ceratocone. Arq. Bras. Oft., 56: 180, 1993.
4 MAGUIRE, L. J.; BOURNE, W. M. - Corneal topography of early keratoconus. Am. J. Ophthalmol., 108: 107-112, 1989.
5 RABINOWITZ, Y. S.; GARBUS, J.; McDONNELL, P. J. - Computer-assisted corneal topography in family members of patients with keratoconus. Arch. Ophthalmol., 108: 365-371, 1990.
6 McDONNELL, P. J.; GARBUS, J. - Corneal topographic changes after radial keratotomy. Ophthalmology, 96: 45-49, 1989.
7 LIN, D. T. C.; SUTTON, H. F.; BERMAN, M. - Corneal topography following excimer photorefractive keratectomy for myopia. J. Cataract. Refract. Surg., 19: 149-154, 1993.
8 HANNUSH, S. B.; CRAWFORD, S. L.; WARING, G. O. III; GEMMILL, M. C.; LYNN, M. J.; NIZAM, A. - Accuracy and precision of keratometry photokeratoscopy, and corneal modeling on calibrated steel balls. Arch. Ophthalmol., 107: 1235-1239, 1989.
9 WILSON, S. E.; VERITY, S. M.; CONGER, D. L. - Accuracy and precision of the Corneal Analysis and the Topographic Modeling System. Cornea, 11: 28-35, 1992.
10 HANNUSH, S. B.; CRAWFORD, S. L.; WARING, G. O. III; GEMMILL, M. C.; LYNN, M. J.; NIZAN, A. - Reprodúcibility of normal corneal power measurements with a keratometer, photokeratoscope, and video imaging system. Arch. Ophthalmol., 108: 539-544, 1990.
11 KOCH, D. D.; WAKIL, J. S.; SAMUELSON, S. W.; HAFT, E. A. - Comparison of the accuracy and reproducibility of the keratometer and the EyeSys Corneal Analysis System Model I. J. Cataract. Refract. Surg., 18: 342-347, 1992.
12 LEGEAIS, J. M.; REN, Q.; SIMON, G.; PAREL, J. M. - Computer-assisted corneal topography: accuracy and reproducibility of the Topographic Modeling System. Refract. Corneal. Surg., 9: 347-357, 1993.