Interferometric measurement of the axial length of the eye

Sverker Hard; Per-Ola Fuxin; Dan Gerhardsson; Per-Arne Torstensson; Tomas Nilsson; Johan Sjostrand

doi:10.1117/12.339166

4 February 1999 Interferometric measurement of the axial length of the eye

Sverker Hard, Per-Ola Fuxin, Dan Gerhardsson, Per-Arne Torstensson, Tomas Nilsson, Johan Sjostrand

Proceedings Volume 3564, Medical Applications of Lasers in Dermatology, Cardiology, Ophthalmology, and Dentistry II; (1999) https://doi.org/10.1117/12.339166
Event: BiOS Europe '98, 1998, Stockholm, Sweden

Abstract

A fast and accurate fiberoptic-based interferometer for non- contact measurements of the axial length of the eye was constructed and tested. A novelty of the interferometer design is the use of a diffractive, bifocal lens, which simultaneously focuses on the cornea and on the retina. A superluminescent light emitting diode with a coherence length of 30 micrometers is used as light source. The axial length of the eye is measured by rapidly translating a reference mirror a distance covering the axial length. The estimated accuracy of a measurement is about 100 micrometer, a number which compares well with those of conventional ultrasonic-based measurements.

Citation Download Citation

Sverker Hard, Per-Ola Fuxin, Dan Gerhardsson, Per-Arne Torstensson, Tomas Nilsson, and Johan Sjostrand "Interferometric measurement of the axial length of the eye", Proc. SPIE 3564, Medical Applications of Lasers in Dermatology, Cardiology, Ophthalmology, and Dentistry II, (4 February 1999); https://doi.org/10.1117/12.339166

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KEYWORDS

Eye

Interferometers

Cornea

Interferometry

Retina

Retroreflectors

Fiber optics

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