The locus of fixation and the foveal cone mosaic

• DOI: 10.1167/5.7.3
• Publication Date: 2006-01-27T15:08:14Z
• Authors: N. M. Putnam; H. J. Hofer; N. Doble; L. Chen; J. Carroll; D. R. Williams
• Keywords: Mosaic

High-resolution retinal imaging with adaptive optics was used to record the position of a light stimulus on cone mosaic, an error at least five times smaller than diameter smallest foveal cones. We discuss factors that limit accuracy which absolute can be determined. In subjects, standard deviation fixation positions measured in discrete trials ranged from 2.1 6.3 arcmin, average 3.4 arcmin (about 17 μm), agreement previous studies (R. W. Ditchburn, 1973; R. M. Steinman, G. Haddad, A. Skavenski, & D. Wyman, 1973). The center fixation, based mean for each three displaced location highest density by about 10 50 indicating alone does not drive retina selected fixation. This method psychophysical or medical applications requiring submicron registration stimuli respect delivering features as small single cells.