HF 300 EXAM 3 QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS
Wavelength
the distance from the peak of one light or sound wave to the peak of the next.
Luminance
Amount of energy coming from a light source
Illuminance
Amount of energy coming off of a surface
Reflectance
Ratio between luminance and illuminance
Cornea
Outer layer of the eye with two main functions: to be a protective layer and a focus
mechanism
Iris
the colored part of the eye, which is the muscle that controls the size of the pupil
(responds to the level of light in the brain)
Pupil
opening in the center of the iris
Lens
Fine tunes focus through process of accomodation
Retina
, Detect light on the back surface of the eye using photoreceptors called rods and cones
Fovea
center field of view, there are only cones within the fovea, where visual acuity is the
highest
Optic disk
axons from the optic nerve leave through the optic disk (where this happens you have a
blind spot)
Rods
responsible for vision at low light levels, peripheral vision, and sensitivity
Cones
responsible for vision at high light levels and acuity
What contributes to sensitivity in the periphery?
Convergence/pooling and photosensitive pigment in the rods called redoxin
What contributes to acuity in the fovea?
High packing density of cones/high cell concentration
Sensitivity-Acuity Tradeoff
What two parts of the eye contribute to focusing?
Cornea and Lens
Photopic vision: Cone-based
- Less sensitive
- Work better with high-light levels
- Gives us ability to differentiate color
COMPLETE SOLUTIONS
Wavelength
the distance from the peak of one light or sound wave to the peak of the next.
Luminance
Amount of energy coming from a light source
Illuminance
Amount of energy coming off of a surface
Reflectance
Ratio between luminance and illuminance
Cornea
Outer layer of the eye with two main functions: to be a protective layer and a focus
mechanism
Iris
the colored part of the eye, which is the muscle that controls the size of the pupil
(responds to the level of light in the brain)
Pupil
opening in the center of the iris
Lens
Fine tunes focus through process of accomodation
Retina
, Detect light on the back surface of the eye using photoreceptors called rods and cones
Fovea
center field of view, there are only cones within the fovea, where visual acuity is the
highest
Optic disk
axons from the optic nerve leave through the optic disk (where this happens you have a
blind spot)
Rods
responsible for vision at low light levels, peripheral vision, and sensitivity
Cones
responsible for vision at high light levels and acuity
What contributes to sensitivity in the periphery?
Convergence/pooling and photosensitive pigment in the rods called redoxin
What contributes to acuity in the fovea?
High packing density of cones/high cell concentration
Sensitivity-Acuity Tradeoff
What two parts of the eye contribute to focusing?
Cornea and Lens
Photopic vision: Cone-based
- Less sensitive
- Work better with high-light levels
- Gives us ability to differentiate color
