ABO Exam Prep 7&8 instrumentation, regulations and standards
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Course
ABO
Institution
ABO
ABO Exam Prep 7&8 instrumentation, regulations and standards
The part of the lensometer which is capable of measuring the amount of prism is the:
A. reticle
B. axis wheel
C. spotting device
D. power drum - ANSWER-A. reticle
Which of the following is a lensometer not capable of measurin...
ABO Exam Prep 7&8 instrumentation,
regulations and standards
The part of the lensometer which is capable of measuring the amount of prism is the:
A. reticle
B. axis wheel
C. spotting device
D. power drum - ANSWER-A. reticle
Which of the following is a lensometer not capable of measuring?
A. sphere power
B. cylinder power
C. base curve
D. position of optical center - ANSWER-C. base curve
You have been asked to neutralize a lens. After placing it in the lensometer, you observe that the three
closely space parallel lines come into sharp focus when the power drum reads -2.50 D and the axis wheel
is set at 180 degrees. In order to bring the three widely spaced lines into focus, the power drum must be
moved to read -3.00 D. These readings would indicate which of the following prescriptions?
A. -2.50 -3.00 x 180
B. -2.50 -0.50 x 90
C. -2.50 -0.50 x 180
D. -2.50 -3.00 x 90 - ANSWER-C. -2.50 -0.50 x 180
According to FDA requirements, glass lenses which have been rendered impact-resistant, must be tested
by which of the following methods?
, A. polariscope
B. drop ball
C. caliper
D. distometer - ANSWER-B. drop ball
In verifying a prescription lens on a lensometer, the axis wheel is set at the prescribed axis (in this case a
180 degrees) but the target appears as per the diagram below. This would indicate that the mounted
lens _______.
A. contains vertical prism
B. has not been heat treated
C. is off axis
D. has been transposed - ANSWER-C. is off axis
This diagram illustrates a lens with _____.
A. base up prism
B. base down prism
C. base in prism
D. base out prism - ANSWER-A. base up prism
Before positioning a lens in a lensometer, it is almost always necessary to:
A. rotate the axis wheel
B. rotate the power drum
C. clean the lens table
D. focus the eye piece - ANSWER-D. focus the eye piece
The lensometer reticle is divided into quadrants for the purpose of:
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