Keratometry is currently achieved by projecting a circular mire onto the patient's cornea and analyzing the size and shape of its reflected image. The projection mires are decisive for the precision of the measurement. We have previously developed a keratometric module for slit lamps, and the development of four projection mires are presented. Mire 1 is composed of optical fibers and electrical cables; Mire 2, 48 LEDs; Mire 3, optical fibers and no electrical cables; and Mire 4, mechanical parts—cable free. Mires 2–4 provide accurate keratometry measurements at slit lamps. Mire 4 is the most adequate for the clinical environment.
© 2007 Optical Society of America
Original Manuscript: April 19, 2007
Revised Manuscript: August 3, 2007
Manuscript Accepted: August 15, 2007
Published: October 4, 2007
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics
Liliane Ventura, Cassius Riul, and Sidney Júlio de Faria e Sousa, "Optical projection mires for measurements of the radii of curvature of the cornea in biomicroscopes," Appl. Opt. 46, 7155-7161 (2007)