Chapter Quiz 7 Flashcards
The _______ is (are) primarily responsible for refracting light to form an image on the retina.
Cornea
The bending of light rays by the optical components of the eye is called
refraction
Cones in the retina form synapses with which of the following cell types?
Bipolar cells
In the scotopic system, the relationship between the number of visual receptor cells and the number of ganglion cells demonstrates a ______ of information
covergence
A high density of ________ is responsible for the dark color of the fovea, and this density is what make visual _________ so high in this area
cones; acuity
What is responsible for the lack of photoreceptors at the optic disc and consequent blind spot?
It is the location where blood vessels and ganglion cell axons leave the eye.
The optic disc is the
area of the retina through which the axons of the ganglion cells exit.
The phenomenon of adaptation refers to
the constantly changing sensitivity of photoreceptors to light in order to match illumination levels
Which pathway accurately describes the route for the passage of visual information to the brain?
Optic nerve, optic tract, optic radiations
Which statement regarding visual fields is true?
The right visual field projects to the eyes and then to the left cerebral hemisphere.
Most axons of the retinal ganglion cells terminate in the
lateral geniculate nucleus
The receptive fields of retinal ganglion cells are
concentric
The edges of visual objects are enhanced through the process of
lateral inhibition
Damage to cortical area V5 results in an inability to perceive
motion
The _______ hypothesis proposed that there are separate receptors in the retina sensitive to blue, green, and red.
trichromatic
Cortical region _______ is especially rich in color-sensitive cells
V4
The dorsal stream system of visual processing is said to specialize in processing information about
“where”
The ventral stream system of visual processing is said to specialize in processing information about
“what”
Recent research suggests myopia may be caused by
indoor lighting
The most common age-related cause of vision loss is
macular degeneration
