BV 1 - Intro
Card Set Information
BV 1 - Intro
What is the diff between diplopia and confusion?
Diplopia - seeing one object in 2 diff places
Confusion - seeing 2 diff objects in the one place
Why is strab a problem?
suppression if infantile
intermittent- asthenopia sx, diplopia
lack of stereo
Adv of treating strab?
improve bv and stereo
relief of sub sx
Disad of treating strab?
poor surgical results
rare- death during surgery
ADV of treating amb?
Disad of treating amb?
occlusion amb which is very difficult to treat
When does suppression occur?
during infancy and plastic ages
only when both eyes are stimulated
What are the 5 associated conditions with amb?
1. Strab amb
2. Aniso amb
3. bilateral Iso amb
4. image degredation
5. Astig amb (uni/bi)
Features of strab amb?
cortical inhibition of input deviating eye
spatial judgements abnormal
grating > letter VA (crowding)
decreased central CS at high SF
Features of aniso amb?
Due to form deprivation and poor BV interaction
spatial judgements normal
grating = letter VA
CS losses all over retina at all SF
Features of iso amb?
same rx in OU
usually uncx astig cf high myp/hyp
often VA improves over time with rx
What are some causes of image degredation/visual deprivation?
Other features of amb?
cortical pathways dorment rather than destroyed
What is horror fusionis?
sensory adaptation to strab
inability to superimpose 2 targets/fuse
when targets approach each other, they seem to jump to the other side