Vision Flashcards
What is the function of the pigmented layer of the retina and what is the pigment?
Melanin
Nutrition
Ensures no reflection back to the retina
What are they 3 classes of visual neurones?
Ganglion
Interneurones
Photoreceptors so rods and cones
What is retinal detachment?
The neural and pigmented layer separate and therefore the photoreceptors may not recieve the nutrition they need
Which layer of the retina are the rods and cones in?
Outer neural layer
What cells does the inner nuclear layer of the retina contain?
Amacrine cells
Horizontal cells
Bipolar cells
What is the function of the ganglion cells?
Responsible for the final output from the retina after it has been to the CNS
What are cones responsible for?
Daytime vision
Colour
What are rods responsible for and where are they not found?
Night vision
Not found in the central retina
What colour vision do we have?
Red, blue and green
How is a colour formed as vision?
Colours arms mixed depending on the cones that are stimulated and also depends on frequency of impulses
What artery supplies the central retina?
The central artery of the retina
What artery supplies the choroid, rods and cones?
The ciliary artery
Where does the upper retinal field tracts go around?
Parietal lobe
Where does the lower retinal field fibres run around?
Temporal lobe
What are the 4 events that happen with accommodation?
Lens bulges
Convergence of eyes
Contraction of ciliary muscles
Pupils constrict
