Difference between revisions of "Parafoveal Vision"
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Parafoveal Vision
</dt>
Vision in which the eye is so oriented toward the pertinent light source
as to have the light fall upon some portion of the retina surrounding the fovea. Also
called scotopic vision. See foveal
vision.
</dd>
The portion of the retina used in this type of vision contains
receptors known as rods. Although these rods do not permit the sort of
color-sensing vision possible with the cones in the central or foveal region
of the retina, they have the useful property of responding to very low
illuminance, particularly after dark adaptation is complete. Nighttime vision
is performed primarily with the rods.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
