other stuff concom

Question 1

normal pfr

Answer 1

Normal : NR PFR c gls : 35-45 BO -> 15 BI
DIS PFR c gls : 15 BO -> 8 BI

Question 2

When you have phoria, how much PFR need to control?

Answer 2

Double
E.g. 10 diopter eso = 20 diopter BI to keep straight

Question 3

hx for decompensating phoria

Answer 3

-frequency of symptoms
-time of occurrence of symptoms
-speed of onset of symptoms
-constancy of symptoms
-general health of px at time symptoms first noticed
-previous ocular investigations/treatment

diplopia: -horizontal / vertical
-when does it occur (near/dis, time of day)
-can you make it single
-mono/binoc (when you close one eye does it disappear)
-anything make it worse or better?
-kids might close one eye (not developed suppression

Question 4

Convergence Weakness Exophoria

Answer 4

(Latent Deviation / Phoria)
XOP greater at Near: Convergence weakness Exo (N>D BI) (by 10/15 Dioptres)
If symptomatic then exercises:
Exercises = +’ve fusional vergence so start with smooth pen exercises, then dot card, then cat stereogram.
Need fundus and media check + recent refraction before starting exercises.

Question 5

Divergence Excess Exophoria

Answer 5

(Latent Deviation / Phoria)
XOP greater at Distance: Divergence Excess Exo (D>N BI)