Vision 2 Flashcards
Factors that affect light and dark adaption
Photosensitive cells
Pupillary size
Neural adaptation
It has a higher sensitivity to light
Cones
This is the most common form of color blindness
Red-Green blindness
What do you call when the a person lost his red cones
Protanope
When a person lost his green cones
Dueteranope
Blue weakness is called
Tritanope
What NTA is utilized by stimulant cells in the neural retina
Glutamate
NTA utilized by the inhibitory cells in the neural retina
GABA
This allows graded conduction of signal strength
Electronic conduction
what principle is to have a high visual accuracy in transmitting contrast borders in the visual image
Principle of lateral inhibition
The main function of the cell is on and off signaling of the stimulus which is light
Amacrine cells
This type of ganglion is small, slow, directionally sensitive and for black and white vision
W cells
It is the most numerous ganglion cells, for fine visual image and for cone vision
X cells
Largest and fastest and it responds to rapid changes in the visual image
Y cells
Magnocellular pathway characteristics
Black and white vision
Poor accuracy
Y cells
Layers 1 and 2
Parvocellular pathway characteristics
Layer 3 to 6
X cells
Color vision
High accuracy
This is also known as striate cortex
Brodmann area 17
Where will the magnocellular and parvocelluar pathway terminate
Layer 4 of the visual cortex
Physiologic blind spot is
15 degrees lateral of the visual field
Scotoma could be due to what
Glaucoma
Allergy
Toxins
Tobacco
What BA is used for frontal eye field and finding your crush ;)
BA 8
Involuntary eye fixation area is located where
Occipital lobe at the calcarine fissure
The eyes normally have 3 types of continuous but almost imperceptible movements
Continuous tremors
Slow drift (nystagmus)
Flicking movements
This is also called as squint or crossed eye
Strabismus
Classic triad of horner’s syndrome
Miosis
Partial Ptosis
Anhidrosis
Pin point pupil is called
Argyll Robertson pupil
