the eye Flashcards
What is accomodation
Accommodation is how the lens is flexible and alters in shape so it can focus on far objects
How are images focused on to the back of the eye
Curvature of the cornea and the lens
What does the retina contain?
The retina contains photoreceptors
The layers of the retina
ganglion cell layer
bipolar cell layer
photoreceptor layer
How does visual information reach the brain?
information is tranduced from light to neural activity, then transmitted to neurons, sent to optic disc, to optic nerve, to the brain
What are photoreceptors?
Cones for colour vision, which function at high illumination. Can be long short or medium length.
Rods which function at low light
What is the fovea?
only contains cones and is responsible for the most detailed vision
What is the blindspot?
The blind section of the retina, there are no photoreceptors as it is directly in front of the optic disc
What does it mean when a cone is sensitive to a specific photopigment?
it causes the photopigment to split
what are the three perceptual dimensions?
- Hue
- Brightness
- saturation
Name of the phenomenon of seeing an image in opposite colours after staring at something?
Negative after image
names of the 4 types of vision in terms of number of recptors
- Monochromatic
- dichromatic
- trichromatic
- tetrachomatic
What is dicromacy?
Dichromacy is when someone is missing a photopigment which causes colour confusion
What is anomolous trichromacy?
Altered photopigment causing slight loss of sensitivty to colour
What is protanopia?
This is lack of a photopigment in the red cones
What is deutrnopia?
green cones filled with red pigment
What is tritanopia?
Involves blue cones so people see the world in red and green
