The relationship between visual resolution and cone spacing in the human fovea.
Visual resolution decreases rapidly outside of the foveal center. The anatomical and physiological basis for this reduction is unclear. We used simultaneous adaptive optics imaging and psychophysical testing to measure cone spacing and resolution across the fovea, and found that resolution was limited by cone spacing only at the foveal center. Immediately outside of the center, resolution was worse than cone spacing predicted and better matched the sampling limit of midget retinal ganglion cells.
Rossi
Ethan A
EA
Vision Science Graduate Group, University of California, Berkeley, Berkeley, California, USA. earossi@berkeley.edu
Roorda
Austin
A
D005584:Fovea Centralis / Q000033:anatomy & histology* / Q000166:cytology / Q000502:physiology*; D006801:Humans; D055095:Optics and Photonics / Q000379:methods; D010775:Photic Stimulation; D011601:Psychophysics; D012160:Retina / Q000033:anatomy & histology / Q000166:cytology / Q000502:physiology; D017949:Retinal Cone Photoreceptor Cells / Q000166:cytology* / Q000502:physiology*; D012165:Retinal Ganglion Cells / Q000166:cytology / Q000502:physiology; D014741:Video Recording; D014787:Vision Tests; D014785:Vision, Ocular / Q000502:physiology*