revision Flashcards
types of phorias
XOP: Convergence weakness (XOP at near), Divergence Excess (XOP at distance), Non-Specific
SOP: Convergence Excess (SOP at near), Divergence Weakness (SOP in distance), Non Specific
L/R Hyperphoria or R/L Hypophoria
Cyclophoria (look @ BV’s)
Incomitant = diagnosed by underlying cause e.g. L hypophoria in 4th nerve palsy
Which way to measure deviation in prisms
ESO = BO
EXO = BI
HYPO = BU
HYPER = BD
Normal PFR
Nr: 35 Dioptres BO -> 15 Dioptres BI
Dis: 15 Dioptres BO -> 5 Dioptres BI
Vertical: 3 BD -> 3 BU
3rd NP muslces
MR, SR, IR, IO
Superior division: SR + Levator Muscle
Inferior Division: MR, IR, IO, sphincter muscle + ciliary muscle
functions of muscles
MR: Adducion
LR: Abduction
SR: Elevation, Intorsion, Adduction
IR: Depression, Exorsion, Adduction
SO: Intorsion, Depression, Abducion
IO: Extorsion, Elevation, Abduction
SOT Bigger @ Nr
Fully Accom SOT, Convergence Excess SOT, Partially Accom (present at all times but increases when accom exerted), Near SOT
SOT bigger @ dist
Distance SOT
SOT same Nr + Distance
Infantile SOT, Acquired (early vs late onset), Acquired with myopia, MicroSOT
XOT bigger @ nr
Intermittent Near XOT
XOT bigger in distance
Intermittent Distance XOT
XOT same Nr + Dist
Intermittent Non-Specific XT, Early Onset XT, Decompensated intermittent XT
critical period + sensitive period
critical = 0-2 years old
sensitive = 2-8/10 years old
types of ambylopia
strabismic, meridional, stimulis deprivation, aniometropic, ametropic
pass mark for logMAR + Kays
logMAR = 0.2
Kays = 0.1
excercises for EXO + ESO
EXO = + fusional vergence
ESO = - fusional vergence
Stereograms ( + = hold card at arms legnth and focus on object between eyes and card) (- = hold card at 33cm, fixate in distance target just above card)
Eso = -‘ve = bar reading (add - or reduce + and read), if BIN can read in front of print, if using one eye, bar will hide text)
Exo at near = smooth convergence (NPC), jump convergence (jump from distant to near target ), Dot card (fix on furthest dot and move to near dot while appreciatign double).
prisms EXO = BO, ESO = BI
post-op diplopia test
-use single letter e.g. P or D
-Will get diplopia if overcorrected after surgery?