HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Campbell, F. W. Articles by Gubisch, R. W. Search for Related Content PubMed PubMed Citation Articles by Campbell, F. W. Articles by Gubisch, R. W.

1. Differences of threshold contrast are predicted from optical theory for a grating acuity target in monochromatic and white light. The greatest differences, up to 65%, are predicted for gratings of lower contrast and pitch than those normally used in measurements of visual acuity.

2. Using three subjects, we measured contrast thresholds with 1·5 and 2·5 mm diameter artificial pupils for natural and paralysed accommodation, using a tungsten lamp and wave-lengths of 546 and 578 mm.

3. Excellent agreement is obtained between predicted and measured differences.

4. Results confirm that observed acuity and sensitivity differences between white and monochromatic lights are largely optical in origin, but involve at least two independent colour mechanisms as spectral weighting functions. Stiles's ₄ and ₅ sensitivities afford a much better fit to observed differences than the C.I.E. visibility curve.

This article has been cited by other articles:

				K. Negishi, K. Ohnuma, N. Hirayama, T. Noda, and for the Policy-Based Medical Services Network Stud Effect of Chromatic Aberration on Contrast Sensitivity in Pseudophakic Eyes Arch Ophthalmol, August 1, 2001; 119(8): 1154 - 1158. [Abstract] [Full Text] [PDF]