Abstract

A simplified noncontact measuring technique for axial eye length was developed. According to this method, the wavelength shift of a single-mode laser-diode beam that is irradiated onto the eyeball causes a phase shift in the interference fringes of reflections from the retina and the cornea. Then the optical distance between the cornea and the retina is obtained from the phase-shift measurement. High-speed axial eye-length measurements can be performed by using a laser diode on a pulse-modulation drive and signals from the reference light path as an analog-to-digital-conversion trigger. Compared with the technique that uses partially coherent light, this technique is inferior in terms of measurement accuracy but superior in its wide, measurable range of 16–32 mm. The results of measurements of 21 adults showed that 2 standard deviations of measurement was 2σ = ±0.11 mm.

© 1993 Optical Society of America

High sensitive measurement of the human axial eye length in vivo with Fourier domain low coherence interferometry

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