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ABO Exam_ Prism Questions with correct answers
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ABO Exam_ Prism Questions with correct answers
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ABO Exam: PrismLooking below the optical center of the following lens would create what type of
prism?-1.00 +2.00 X30 - CORRECT ANSWER-base up
+4.50 +0.50 X180+2.00 +0.25 X090ADD +1.75What is the vertical imbalance at
a 10mm reading level? - CORRECT ANSWER-3.0 prism diopters
+2.50 -0.50 X180+2.50 sphPD 67Optical centers are placed 63mm apart. How
much total prism will this produce, and in which direction is the base? -
CORRECT ANSWER-1.0 prism diopters base in
If the RX-3.00 +0.50 x090 is decentered out 2mm too much, how much prism will
be created and in which direction is the base? - CORRECT ANSWER-0.50 prism
diopters base in
What is the vertical imbalance of the following RX at the reading level of
10mm?-1.50 -1.00 x090-4.00 -1.00 x120+3.00 ADD - CORRECT ANSWER-2.75
prism diopters
What is the image jump if the patient is wearing a flat top 25 segment?-1.50 -1.00
x090-4.00 -1.00 x120+3.00 ADD - CORRECT ANSWER-1.5 prism diopters
When prism is prescribed to correct a muscle imbalance, where is the base
placed? - CORRECT ANSWER-Over the weak muscle
A -5.00 D lens decentered in 4mm produces - CORRECT ANSWER-2.0 base out
Excessive base up prism - CORRECT ANSWER-makes people feel like they are
walking downhill
The regular slab off grinds prism in which direction in the lens? - CORRECT
ANSWER-up
The most commonly used prescription for correcting muscle imbalance in
esotropia - CORRECT ANSWER-base out prism
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