Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2014 Dec 5;8:89. doi: 10.3389/fnint.2014.00089

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2014 Coubard, Urbanski, Bourlon and Gaumet.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

(A) The human eye and its visual axis. The fovea (1° to 2° of visual angle) contains high density of cones but no rod. Cone concentration decreases with increasing distance to the fovea and stabilizes for the rest of the retina. Rod concentration reaches its maximum at 20° of retinal eccentricity than decreases until the peripheral limit of the retina. (B) The two eyes move in direction thanks to a step (saccade) or smooth (pursuit) movement to foveate a target in eccentricity (to the left, to the right, up, down, or in any oblique direction). (C) The two eyes move in depth thanks to a step or smooth (vergence) movement to foveate a target in distance (at close or at far). (A) Adapted from Bagot (1999, p. 128, Figure 35) (© O.A. Coubard, with permission); (B,C) From O.A. Coubard.