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44 Cards in this Set

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Before what steps during an exam is it important that you balance?
Binocular testing and near testing
the end point of dissociated blur is that both charts are
equally blurry
Who do you NOT balance
Presbyopes, Tropes, Monovision pts
After what step during refraction do you balance?
Monocular subjective
Purpose of Balance
To equalize the stimulus
What are the BI-OCULAR methods of balanceing
Blur, Red-Green, Goodwin, Cross Grid
in which balancing method do you ask which line of letters are "clearer"
dissociated blur, goodwin
for dissociated blur, the VAs can be/must be
Equal
for red green, the 20/___ line of letters is isolated
40
blur dissociated with ____diopters
+0.75
What are the BINOCULAR methods of balancing
Vectographic and Turville
why is it imporant to balance
stereo acuity and fusional vergence will be decreased (possibly resulting in surgery)
if overminused in red green, the _______ side (what color) will appear to be clearer
green
for dissociated, the 20/___ line of letters is isolated
40
in which balancing method do you ask which letters are "blacker/darker/sharper"
red green
if overplussed in red green, the _______ side (what color) will appear to be clearer
red
the room conditions in bichrome (aka red green) is/are
dark
for goodwin it is important that the VAs can be/must be
equal
for red green it is important that the VAs can be/must be
unequal
in goodwin, isolate the 20/___ line of letters
20 or 25
during goodwin, if the eyes are unbalanced, add +0.25 to which eye?
the eye seeing the clearer image
during goodwin, if the eyes are unbalanced after adding +0.25 to the clearer seeing eye
remove +0.25 from the clearer seeing, and add -0.25 to the poorer seeing.
during goodwin, if the eyes are unbalanced after removing +0.25 from the clearer seeing, and adding
-0.25 to the poorer seeing, then
cause a .5 diopter interval by adding an addition +0.25 to the better seeing
during goodwin, if the eyes are unbalanced after causing a .5 diopter interval by adding an addition +0.25 to the better seeing then
remove the -0.25 (from the poorer seeing)and add an additional +0.25 to the better seeing (keeping the .5 diopter interval)
if you have tried every single step in goodwin, and have failed at balancing their eyes, the next step is to
redo Monocular subjective
in vectographic, it is important that the VAs can be/must be
unequal
the balancing method that uses a polarized chart is
vectographic
for vectographic, you can fog with either ____ or ____ diopters
+0.5 or +.75
in alternate occlusion, isolate the 20/___ line of letters
25
if the eyes are unequal in alternate occlusion method, add ____ diopters to the ______ (better/poorer)seeing
+.25, better
this balancing method utilizes a septum
turville
In alternate occlusion, it is important the the VAs can be/must be
equal
in these balancing methods, balance is automatic
Turville and Vectographic
These balancing methods depend on equal acuities
Dissociated Blur, Goodwin, and Alternate Occlusion
In this balancing method, you instruct the patient to look at one side of the chart but keep both eyes open
Vectographic
these methods of balancing depend on equal rate of blurring on each eye
Blur and Goodwin
In these methods of balancing the patient is not fused
cross-grid, blur, goodwin, redgreen, and alternate occlusion
unequal pupils during this balancing method may mess up your results
red green
these balancing methods allow the patient to simultaneously compare 2 line of letters
dissociated blur and goodwin
these balancing methods require minimum blur, and are thus more accurate
Goodwin and Alternate
this method of balancing has no available chart
cross grid
these methods of balancing are not good to use on poor binocular vision patients.
turville and vectographic
this balanacing method can be used on patients that suppress and eye
red green
if a patient is not balanced, what will result?
stereo may be reduced, fusional amps may be reduced