Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Counterphase modulation photometry: comparison of two instruments

Not Accessible

Your library or personal account may give you access

Abstract

The ratio of long-wavelength to medium-wavelength sensitive cones varies significantly among people. In order to investigate the possible effect of this variation in large numbers of participants, a quick and efficient method to estimate the ratio is required. The OSCAR test has been utilized previously for this purpose, but it is no longer available commercially. Having access to one of the few remaining OSCAR instruments, we compared the observers’ mean settings to those obtained with the Medmont C100, a newer but apparently similar device. We also obtained Rayleigh matches for each participant. One hundred volunteers took part in the study. Settings on the OSCAR test were highly correlated with those on the Medmont C100. Both tests appeared to be influenced not only by LM cone ratios but also by the spectral positions of the cone photopigments, since anomaloscope midmatch points accounted for a significant proportion of the variance. We conclude that the Medmont C100 can be used as a suitable replacement for the OSCAR test and has a role in the rapid estimation of LM cone ratios.

© 2013 Optical Society of America

Full Article  |  PDF Article
More Like This
Counterphase modulation flicker photometry: phenotypic and genotypic associations

A. J. Lawrance-Owen, J. M. Bosten, R. E. Hogg, G. Bargary, P. T. Goodbourn, and J. D. Mollon
J. Opt. Soc. Am. A 31(4) A226-A231 (2014)

Performance of normal females and carriers of color-vision deficiencies on standard color-vision tests

Elise W. Dees and Rigmor C. Baraas
J. Opt. Soc. Am. A 31(4) A401-A409 (2014)

Flicker-photometric electroretinogram estimates of L:M cone photoreceptor ratio in men with photopigment spectra derived from genetics

Joseph Carroll, Carrie McMahon, Maureen Neitz, and Jay Neitz
J. Opt. Soc. Am. A 17(3) 499-509 (2000)

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 Optica member, or as an authorized user of your institution.

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

Figures (2)

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

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

Tables (1)

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

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

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved