Associated Phoria

Question 0

.Diff btwn associated phoria and fixation disparity

Answer 0

• Associated phoria = Amount of prism that neutralizes fixation disparity
  (good for prescribing vert prism)
• Fixation disparity = Misalignment of visual axes that occurs under fused BV conditions
  (good for prescribing horiz prism)

Question 1

.Prism amount to prescribe, according to clinical wisdom

Answer 1

Eso - Full amount
Exo - 1/3 of amount
Vert - Full amount

Question 2

.Devices for det amount of fixation disparity

Answer 2

• Sheedy disparometer

- Wesson card

Question 3

.Fixation disparity curve

Answer 3

X-axis - BI -> BO
Y-axis - Eso -> Exo

X-intercept - Associated phoria
Y-intercept - Fixation disparity