Affordable Access

Publisher Website

Instrument for Measuring Relative Brightness Perception

American Journal of Ophthalmology
DOI: 10.1016/s0002-9394(14)70068-6


Neuro-ophthalmic disorders may cause a subjective difference in the brightness perceived by each eye. We developed a unique clinical device to measure this difference. The device consists of a disk equipped with graded neutral-density filters that fits into a View-Master stereo viewer (View-Master International Group, Inc., Portland, Oregon). This device provides simultaneous viewing of a stimulus target for each eye, and is administered in a random, forced-choice format that allows assessment of patient reliability. We administered this test to 37 control subjects and 84 patients with a variety of disorders. Thirty-six of the 37 control subjects (97%) and 51 of the 84 patients (61%) had no measured relative brightness deficit and no errors. Of the 34 subjects who had abnormal results, 21 (62%) isolated a relative brightness deficit within 0.2-log unit steps without error, and 28 (82%) did so within 0.4-log unit steps. This device proved to be a simple, reliable instrument for measuring relative brightness perception.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

Instrument for measuring relative brightness perce...

on American journal of ophthalmol... May 15, 1994

Validation and application of an instrument for me...

on International journal for qual... June 2003

A tool for measuring relative effects of hue, brig...

on Perceptual and motor skills December 1982
More articles like this..