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when eyes move to place image of object of regard onto foveae
What is normal BV? (5)
- appropriate acc enables clarity
- each image is clear and of similar clarity
- each image reaches the appropriate neural areas to enable fusion
- perception and action
Value of having 2 eyes (5)
- VA - visual summation
- better contrast sensitivity
- better visual field
- a spare eye
What is motor fusion
both eyes pointing at the OOR to allow the images to be on the fovea
What is duction
monocular eye mvt
What eye movements are there?
what are versions
both eyes move with the angle between them staying the same
what is vergence
- both eyes move
- angle between the eyes change
What CN innervate to EOMs?
- CN3: IO, IR, MR, SR
What is the law of equal innervation?
- innervation to the muscles of the two eye is equal and simulatenous
What are the requirements for sensory fusion
- equal in size
- equal in luminance images
What is the law of reciprocal innervation
- any innervation to a muscle to contract (agonist) will be accompanied by an equal inhibitory input to the direct antagonist to relax
What are the levels of fusion of form (5)
- simultaneous perception
- flat fusion
- stereopsis/"fusion with float"
What is the primary visual direction?
when the image is on the fovea
what is the secondary visual direction
when the image is NOT on the retina
what are corresponding points?
when there is a common visual direction