Optical projection mires for measurements of the radii of curvature of the cornea in biomicroscopes

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 d...

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Bibliographic Details
Published inApplied optics (2004) Vol. 46; no. 29; p. 7155
Main Authors Ventura, Liliane, Riul, Cassius, Sousa, Sidney Júlio de Faria E
Format Journal Article
LanguageEnglish
Published United States 10.10.2007
Subjects
Automation
Cornea - pathology
Corneal Diseases - diagnosis
Corneal Topography
Equipment Design
Humans
Models, Statistical
Ophthalmology - instrumentation
Ophthalmology - methods
Optics and Photonics
Refraction, Ocular
Research Design
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Summary: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.
ISSN:1559-128X
DOI:10.1364/AO.46.007155