ABO EXAM PRE-TEST QUESTIONS AND
CORRECT ANSWERS
-.75 -.50 x 120 - Correct AnswerThe patient's RX is -1.75 -.50 x 120 with a +2.00 add standard trifocal. What is the power through the intermediate.
- -1.25 -.50 x 120
- -.75 -.50 x 120
- -.75 -.50 x 30
- -1.00 -.50 x 150
-0.50 - Correct AnswerThe spherical equivalent of the lens +1.00 -3.00 x90 is
A. +0.50
B. -0.50
C. +1.25
D. -1.25
-0.50 -2.50 x115 - Correct AnswerWhich RX of the following is the same as the
following RX: -3.00 +2.50 x25
- -3.00 +2.50 x105
- -0.50 -2.50 x115
- +0.50 +2.50 x115
- +3.00 -0.50 x105
-2.00 -1.00 x90 - Correct AnswerThe optician has just neutralized an unknow power lens with test lenses. The test lens used to neutralize the power in the vertical is a plus 2.0 and the test lens used to neutralize the power in the horizontal is a plus 3.00. What is the RX?-2.00 +0.50 x180 -2.00 -1.00 x 90 -1.50 -0.50 x 180 +1.00 +0.50 x180
-3.25 -1.50 x180 - Correct AnswerIf your lensometer reads +0.25 with no lens, a lens that measures -3.00 -1.50 x180 is actually
- -2.75 -1.25 x180
- -2.75 -1.50 x180
- -3.25 -1.75 x180
- -3.25 -1.50 x180
-9.50 - Correct AnswerA patient refracted at 15mm is prescribed a -10.00 shpere. The dispenser finds that the actual fitting distance will be at 10mm. What should the compensated lens power be?
A. -9.50
B. -9.75
C. -10.75
D. -10.50 1 / 3
+1.00 -1.25 - Correct AnswerIn neutralizing a lens of unknown power your first reading is +1.00 and the next reading that focuses the cylinder target is -0.25.What is the RX?
A. +1.00 -0.25
B. -0.25 +2.00
C. +1.00 -1.25
D. +0.25 +2.25
+1.75 -.25 x90 - Correct AnswerWhat would the reading RX be if the following distance
RX and bifocal addition are given:
- +.50 -.25 x90
- +1.75 -.25 x90
- +2.75 -.25 x90
- +1.25 -.25 x90
+2.00 -2.00 x90 - Correct AnswerWhich of the following has no power in the 180 degree median?
- +2.00 -2.00 x90
- +2.00 +2.00 x180
- +1.00 +1.00 x135
- +1.00 -2.00 x45
+2.50 - Correct AnswerIf the RX is OS +1.00 +3.00 x45, what would be the total power at axis power 90?
A. +1.00
B. +2.00
C. +2.25
D. +2.50
+6.12/+8.12 - Correct AnswerWhen verifying an add on on a 1 piece bifocal with a lens clock, a +2.00 add would clock ____ in the distance and ______ in the segment.
A. +6.12/+8.12
B. +4.50/-7.25
C. +4.37/+7.12
D. +3.75/+1.00
- diapter - Correct AnswerDetermine imbalance at the reading level in the following
- 4 diapters
- 2 diapters
- 1 diapter
- No imbalance
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prescription (10mm reading depth) OD: -4.00 -2.00 x90 OS: -1.00 -3.00 x180
- diapter base in prism - Correct AnswerA +2.00 diopter lens decentered in 5mm
- 1 diapter base out prism
- 2 diapters base out prism
- 1 diapter base in prism
- 2 diapters base in prism
beyond the patients measured pd will create
- diapter base out/each eye - Correct AnswerThe P.D. written on the order is
- 1 diapter base out/each eye
- 1 diapter base in/each eye
- 2 diapters out/each eye
- 2 diapters in/each eye
mistakenly noted as 70mm, when the actual measurement should be 66mm. What unwanted prism would be found if the distance prescription is O.U. +5.00 shpere.
- diapter of base out prism - Correct AnswerA minus 5 diapter lens decentered in 2mm
beyond what is called for to achieve the correct PD creates:
- 1 diapter of base in prism
- 1 diapter of base out prism
- 2 diapters of base in prism
- 2 diapters of base out prism
1.00 Diapter base down - Correct AnswerThe patient is looking 10 mm below the distance optical center. What is the prismatic effect to the patient from the distance RX at that level?
- 1.00 diapter base up
- 1.00 diapter base down
- 2.00 diapter base up
- 2.00 diapter base down
1.8 diapters base in - Correct AnswerA lens which reads +3.00 -2.00 x180 is decentered in 6mm too much. How much horizontal prism is created by this error.
- 1.8 diapters base in
- 1.8 diapters base out
- .6 diapters base in
- .6 diapters base out
1.53 - Correct AnswerThe refractive index to which optical tools and gauges are calibrated is
A. 1.49
B. 1.523
C. 1.53
D. 1.56
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