ABO Exam Prism Questions and
Answers2
Looking below the optical center of the following lens would create what type of prism?-1.00
+2.00 X30 - ANSWERS-base up
+4.50 +0.50 X180+2.00 +0.25 X090ADD +1.75What is the vertical imbalance at a 10mm reading
level? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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 - ANSWERS-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 - ANSWERS-1.5 prism diopters
When prism is prescribed to correct a muscle imbalance, where is the base placed? - ANSWERS-
Over the weak muscle
A -5.00 D lens decentered in 4mm produces - ANSWERS-2.0 base out
Excessive base up prism - ANSWERS-makes people feel like they are walking downhill
Answers2
Looking below the optical center of the following lens would create what type of prism?-1.00
+2.00 X30 - ANSWERS-base up
+4.50 +0.50 X180+2.00 +0.25 X090ADD +1.75What is the vertical imbalance at a 10mm reading
level? - ANSWERS-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? - ANSWERS-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? - ANSWERS-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 - ANSWERS-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 - ANSWERS-1.5 prism diopters
When prism is prescribed to correct a muscle imbalance, where is the base placed? - ANSWERS-
Over the weak muscle
A -5.00 D lens decentered in 4mm produces - ANSWERS-2.0 base out
Excessive base up prism - ANSWERS-makes people feel like they are walking downhill