A patient presents with a head tilt that is down and to the left, what is the likely problem?
OD fourth nerve palsy
What is a real point plot imaged on corresponding points?
When an axial anisometrope is corrected at the corneal plane the ________ is proportional to the ____________?
axial length, image size
What is the anomalous innervation of the lateral rectus by cranial nerve three?
Duane's Retraction Syndrome
What is RX is given to correct a patient with an associated phoria due to a paretic Right Superior Oblique?
base down prism
If the patient presents with an intermittent left esotropia which direction is the likely head turn?
Why is the binocular facility of accommodation less than monocular?
due to added demand of fusional vergence
Points on the horopter have how much disparity?
Binocular CS is how much greater than monocular CS in log units?
40 percent or 0.15
A patient with reading deficiency will have increased_______ and _____?
regressions and fixations
What is the minimum prism needed to neutralize a patients fixation disparity?
What is decreased in a patient with reading deficiency?
reading speed with frequent re reading
Which EOM's move the eyes up?
Superior Rectus and Inferior Oblique
What is tested while producing rapid changes in fusional vergence?
How many letters can be expected to be gained when switching from OD or OS to OU in VA testing?
three to five
WHat is the phoria of an orthophore that puts on 4pd BO OU?
eight PD XP
If a patient presents with an intermittent left exotropia what is the habitual head turn?
Vertical magnification in the right eye makes objects appear closer to the ________eye?
What can be done to increase magnification of a lens?
increase lens front surface power and/or thickness
On the worth four dot a patient sees two red dots at distance while wearing red OD, Green OS, what is the likely condition?
central suppression OS
What muscles move the eyes down and right?
left superior oblique and right inferior oblique
A patient presents with a unilateral cataract, optic neuritis, and an abnormal pulfrich, what is the likely cause?
After a patient is allowed to adapt to 2 base out OD, OS, what is the phoria when the Rx is removed?
When measuring FD fixation disparity what is seen by the OD, OS?
Top is seen by OD bottom OS
If the patient presents with an exo deviation what is the displacement on the Wesson card?
Top line is displaced to the left
What is anisokonia?
A difference in perceived retinal size
If the OS pupil is 3mm and the OD is 7mm which way would the pendulum appear to move?
What is the x-intercept on the FD curve?
Prism needed to to neutralize FD
True or false
A patient that is -1.00 OD, +1.00 OS corrected with spectacles has a slightly larger retinal image in the plus eye
False equal retinal images
A patient sees 5 dots on the worth four dot, what is this indicative of?
First degree fusion
Horizontal magnification on the left eye will have what effect on the horopter?
Moves the horopter closer
What effect does horizontal magnification have on the appearance of distance objects?
Appear farther on the left
Why is overall magnification less than the sum of induced or geometric effects?
Effects cancel each other out
A patient that alternates between 4,2,and 5 dots on the worth four dot likely has what condition?
An intermittent eye turn
What is the Y-intercept on the FD curve?
Amount of FD
On a Wesson card the patient sees the top line is moved right what is the likely problem?
What lens does the slab off prism go on?
If a patient has a left hyperphoria in downgaze through bifocals due to a left SO paresis what type of RX should be considered?
Slab off OD