Abstract
An improved version of a method which uses the Maxwell spot to measure eccentricity of fixation is described and discussed. The method determines the centroid of the macula psychophysically and locates the position of this centroid with respect to the point the O uses for fixation. The distance between these two points is a measure of eccentricity of fixation. It is estimated that the present method has an instrumental error of about 0.1 deg.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
FLOM, M. C., & WEYMOUTH, F. W. Centricity of Maxwell’s spot in strabismus and amblyopia. Archives of Ophthalmology, 1961, 66, 260–268.
GRAHAM, C. H. Discriminations that depend on wavelength. In C. H. Graham (Ed.),Vision and visual perception. New York: Wiley, 1965. Pp. 350–369.
Author information
Authors and Affiliations
Additional information
This research was supported by National Eye Institute Grant EY00800 to the first author. We thank Professor Fred Billmeyer, Jr., R. Marcus, E. D. Campbell, and D. Phillips of the Rensselaer Color Measurement Laboratory of Rensselaer Polytechnic Institute for help and advice in selecting filters and determining the chromaticity coordinates of these filters. The authors also owe a debt of gratitude to Paul E. Grattan, OD (Waterford, New York), our project consultant, who graciously lent us a Maxwell spot stimulator, which became the basis for the one described here.
Rights and permissions
About this article
Cite this article
Kandel, G.L., Bedell, H.E. A precise method of measuring fixational eccentricity using the Maxwell spot centroid. Behav. Res. Meth. & Instru. 4, 295–296 (1972). https://doi.org/10.3758/BF03207308
Issue Date:
DOI: https://doi.org/10.3758/BF03207308