BV 2 - EF
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BV 2 - EF
What are key notes when diagnosis EF?
What is EF?
incorrect visual direction
assoc with strabs amb>aniso
What are some of the features of unstable fixation?
saccadic intrusions and increase in drifts
lots of over and undershoots
fixation is more steady if dark adapted
What are some tests for EF?
Brock Givner after image
Haidinger brush viewed with OD - sees brush 1cm to the right standing 20cm away?
5PD temporal EF OD steady
How does the Haidinger brushes work?
Foveal tag procedure
Diffraction of Henle's Fibre Layer - see brush/propeller
Disad of Haidinger's brushes?
Sometimes they arent able to see the brushes
subjective - patients need to be old enough to respond with answers
When are EF tests indicated? Entopic?
ONLY when VA is decreased
entopic - only if px >7yo and visuoscopy failed - too unsteady
Brock Givner - looking with OD (OS was zapped) sees vert line 1.6cm to the left of dot standing 40cm?
4PD nasal EF of OD - steady