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Proceedings Paper

Surgical device for supporting corneal suturing
Author(s): Liliane Ventura; Gunter C. D. Oliveira; Jean-Jacques De Groote; Sidney J. F. Sousa; Paula Saia
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Paper Abstract

A system for ophthalmic surgery support has been developed in order to minimize the residual astigmatism due to the induced irregular shape of the cornea by corneal suture. The system projects 36 light spots, from LEDs, displayed in a precise circle at the lachrymal film of the examined cornea. The displacement, the size and deformation of the reflected image of these light spots are analyzed providing the keratometry and the circularity of the suture. Measurements in the range of 32D - 55D (up to 23D of astigmatism are possible to be obtained) and a self-calibration system has been designed in order to keep the system calibrated. Steel precision spheres have been submitted to the system and the results show 99% of correlation with the fabricant's nominal values. The system has been tested in 13 persons in order to evaluate its clinical applicability and has been compared to a commercial keratometer Topcon OM-4. The correlation factors are 0,92 for the astigmatism and 0.99 for the associated axis. The system indicates that the surgeon should achieve circularity ≥98% in order to do not induce astigmatisms over 3D.

Paper Details

Date Published: 23 February 2009
PDF: 8 pages
Proc. SPIE 7163, Ophthalmic Technologies XIX, 71631K (23 February 2009); doi: 10.1117/12.805970
Show Author Affiliations
Liliane Ventura, Univ. de São Paulo (Brazil)
Gunter C. D. Oliveira, Univ. de São Paulo (Brazil)
Jean-Jacques De Groote, Univ. de São Paulo (Brazil)
Sidney J. F. Sousa, Univ. de São Paulo (Brazil)
Paula Saia, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 7163:
Ophthalmic Technologies XIX
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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