PSY/CS330 Human Factors
5/2/00
Day 1-
5
The Retina
u
Two Types of Receptors
l
Rods
u
~120 million/eye
u
night vision
u
no color
u
not in fovea
u
most about 20deg in
periphery
l
Cones
u
~7 million/eye
u
day vision
u
three types so color
vision
u
most in fovea
from Lewis, Zeevi, & Werblin (1969)
Discuss the implications of this arrangement.