Effect of source intensity on the variability of eye movements during deliberate fixation

Brian Jason Lund; Harry Zwick; David J. Lund; Bruce E. Stuck; James W. Ness

doi:10.1117/12.426716

17 May 2001 Effect of source intensity on the variability of eye movements during deliberate fixation

Brian Jason Lund, Harry Zwick, David J. Lund, Bruce E. Stuck, James W. Ness

Proceedings Volume 4246, Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment; (2001) https://doi.org/10.1117/12.426716
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

During long-term viewing of a continuous light source, head and eye movements affect the distribution of energy deposited in the retina. Previous studies by this group of eye movements during a fixation task were used in revising the safety limits for long term viewing ofsuch sources. These studies have been continued to determine the effect of source brightness on the nature of fixational eye movements VoIuntees fixated for up to 50 seconds on a HeNe laser (? 632 8 nm) masked by a 25 xm diameter aperture to produce a small source subtending OO3 mrad in the visual field. The source was attenuated to yield cornea! irradiance values m the range 0 6 pW/cm2 to 6 tW/cm2 Eye movements were recorded using a Dual Purkmje Image Eye Tracker The hypothesis was that eye movements become more erratic as source intensity is increased toward levels that induce an aversion response This would add a safety maigin when viewing a bright source, as the energy deposited in the retina would be spread over a larger area However, the data do not exhibit any change in the tightness of fixation with increasing source intensity. The area covered by the eye movements during successive 250 ms time slices exhibits a relatively flat trend during the course ofthe 50 second fixation task for all source intensities considered in this study, suggesting that there was no loss of ability to fixate nor drive to an aversion response during the course ofthe trials.

Citation Download Citation

Brian Jason Lund, Harry Zwick, David J. Lund, Bruce E. Stuck, and James W. Ness "Effect of source intensity on the variability of eye movements during deliberate fixation", Proc. SPIE 4246, Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment, (17 May 2001); https://doi.org/10.1117/12.426716

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
9 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Eye

Retina

Cornea

Helium neon lasers

Data acquisition

Light sources

Optical filters

Show All Keywords

Keywords/Phrases

Search In:

Publication Years