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2 variables affect the shape of a horopter.
- 1) skew - relates to relative magnification, R.
- 2) curvature - this is the Hering-Hillerband deviation, H.
What is Horopter skew and what is the equation?
R = tan (alpha-2)/ tan (alpha-1)
- If both eyes lie on the horopter the 2 angles, alpha 1 & 2 are equal to each other so R = 1 and therefore no relative magnification in either eye. Object space = perceived space.
When the 2 angles don't = to make R=1, one eye's image is mag/minified relative to the other, aniseikonia.
If alpha-1 is kept the same and alpha 2 is magnified which way do we move the rod? Closer or farther?
Closer so the angle of alpha-2 becomes smaller again to match alpha-1.
A horopter always skews towards the ____ eye.
Move the 2 points P and Q to put it back on the horopter and what does the new horopter look like?
Which point displays Crossed or Uncrossed disparity.
- P is crossed. Q is uncrossed.
- Push P farther and pull Q closer.
If R>1, which eye is magnified and what does the new horopter look like?
- R>1 then
- R<1 then