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

Full Article  |  PDF Article
OSA Recommended Articles
An Accommodometer: an Apparatus for Measuring the Total Accommodation Response of the Human Eye

G. J. van der Wildt and M. A. Bouman
Appl. Opt. 10(8) 1950-1958 (1971)

Opto-mechanical design of a dispersive artificial eye

Mark F. Coughlan, Toshifumi Mihashi, and Alexander V. Goncharov
Appl. Opt. 56(15) 4338-4346 (2017)

Simulation of eccentric photorefraction images

Ying-Ling Chen, Bo Tan, and J. W. L. Lewis
Opt. Express 11(14) 1628-1642 (2003)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription