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Updated: Jul 21, 2026

The Gateway to the Brain: Dissecting the Primate Eye
Published on: May 27, 2009
Packing arrangement of the three cone classes in primate retina
A Roorda1, A B Metha, P Lennie
1University of Houston College of Optometry, Houston, TX 77204-6052, USA. arooda@uh.edu
Abstract:
We describe a detailed analysis of the spatial arrangement of L, M and S cones in the living eyes of two humans and one monkey. We analyze the cone mosaics near 1 degrees eccentricity using statistical methods that characterize the arrangement of each type of cone in the mosaic of photoreceptors. In all eyes, the M and L cones are arranged randomly. This gives rise to patches containing cones of a single type. In human, but not in monkey, the arrangement of S-cones cannot be distinguished from random.
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