Located in the retina, contain photosensitive pigments that will respond to light by sending an electrical potential to specialized nerve cells
Rods & cones
Improved in daylight because of the high concentration of cones in the fovea centralis
Visual acuity
Greater recognition of contrast since cones are able to detect changes in brightness better than rod cells
Contrast perception
Visual phenomenon involving the perception of extremely small or faint details
Threshold detection
Phenomenon to explain boundary effect
Mach effect
Compresses the entire density scale while making the boundary appear more distinct than it really is
Edge enhancement
