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23 February 2009 Surgical device for supporting corneal suturing
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Proceedings Volume 7163, Ophthalmic Technologies XIX; 71631K (2009) https://doi.org/10.1117/12.805970
Event: SPIE BiOS, 2009, San Jose, California, United States
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.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Liliane Ventura, Gunter C. D. Oliveira, Jean-Jacques De Groote, Sidney J. F. Sousa, and Paula Saia "Surgical device for supporting corneal suturing", Proc. SPIE 7163, Ophthalmic Technologies XIX, 71631K (23 February 2009); https://doi.org/10.1117/12.805970
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