O3A 1 BV intro
Card Set Information
O3A 1 BV intro
What is motor fusion?
the ability for the eyes to move so that the images lie on corresponding points on the retina
What happens when motor fusion fails?
when the images do not lie on corresponding points, retinal disparity occurs
What happens when there is a small amount of retinal disparity?
What happens when theres is a large amount of retinal disparity?
diplopia occurs- one eye may be suppressed leading to a strabismus
What are ductions?
monocular eye movements
What are versions?
BE movements where the angle between the two eyes are constant
What are 2 examples of versions?
pursuits and saccades
What is a pursuit?
smooth rotations of the eye
What are saccades?
fast abrupt movement of the eye
What are vergences?
BE movements where the angle between the eye changes
which nerves innervate the eye?
occulomotor, abducens, trochlear
What muscles does the occulomotor innervate?
ipsi- IR, IO and MR
What muscles does the abducens nerve innervate?
What is Hering's Law?
law of equal innervation
L and R MR are yoked
What conditions disobey Hering's law?
What is sherrington's law?
law of reciprocal innervation
What is sensory fusion?
process where images on the retina of two eyes are fused in a single image in the visual cortex
What is suppression?
image of the strabismic eye is not perceived and turned off at the cortex
What is simultaneous perception?
two eye's images are not at corresponding points on the retina
What is superimposition?
two diff images but from two diff eyes on top of each other
What is flat fusion?
combining similar images but there is no depth perception
Stereopsis or fusion with float?
combination of images with depth