Term
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Definition
| The locus of all points in visual space that are imaged on corresponding points in each eye when the eyes are converged to aim at a particular fixation point |
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Term
| Name three ways the horopter can be measured? |
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Definition
MSIZE
1. Identical visual directions-when two targets each presented to one eye appear to be in identical visual directions, these targets must stimulate corresponding retinal points
2. Equidistance (stereopscopic depth matching) locations that appear as being the same distance from the observer as the fixation point define a horopter
3. singleness
4. minimum stereoacuity threshold
5. Zero vergence |
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Term
| What is the Herring Hillebrand horopter deviation (H)? |
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Definition
| The difference in curvature between the horopter and the Vieth-Mueller circle, as measure at the fixation point. |
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Term
| What is the value of H when the horopter is more curved than the Vieth Mueller circle? |
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Definition
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Term
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Definition
| +0.1 or + 0.2 indicating a horopter flatter than the Vieth Mueller circle |
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Term
| What is the abathic distance? |
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Definition
The point at which the apparent and objective frontal planes coincide, the horopter is truly flat
H=(2a/b)
2a=PD
b= fixation distance |
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