ABO Exam Practice Questions And Correct
Answers, With Complete Verified Solution.
100% 2024
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
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
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
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
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
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
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
D. focus the eye piece
The lensometer reticle is divided into quadrants for the purpose of:
A. indicating the direction of the prism base
B. determining the cylinder axis
C. verifying the power in diopters
D. none of the above
A. indicating the direction of the prism base
FMLA refers to:
A. Family Medical Leave Act
B. Federally Mandated Lens Act
C. Federal Manufacturers Lens Association
D. Frame Manufacturer Labeling Act
A. Family Medical Leave Act
A patient enters your dispensary complaining of severe eye pain. What is your
first course of action?
A. check base curves and positioning of optical centers
B. perform follow-up keratometer readings
C. immediately refer to their eye doctor
D. re-align fit of adjustable nose pads
C. immediately refer to the eye doctor
The _______ is a non-governmental agency with functions to establish standards
for a wide variety of industrial and commercial interest.
A. American National Standard Institute (ANSI)
B. Occupational Safety and Health Administration (OSHA)
, C. Food and Drug Administration (FDA)
D. Federal Trade Commission (FTC)
A. American National Standard Institute (ANSI)
According to ANSI standards, a lens containing 0.25 diopters of cylinder must be
within _______ of the specified axis.
A. +- 2.0°
B. +- 3.0°
C. +- 5.0°
D. +- 7.0°
D. +- 7.0°
A lens containing over 1.50 diopters of cylinder must be within ______ of the
specified axis.
A. +- 2.0°
B. +- 3.0°
C. +- 5.0°
D. +- 7.0°
A. +- 2.0°
According to ANSI standards, the base curve received must be within ______ of
that specified.
A. +-0.25 D
B. +-0.50 D
C. +-0.75 D
D. +-1.00 D
C. +-0.75 D
Your patient insists that his visual acuity is sharper through his old glasses than
the new ones just delivered. What is the first thing you do?
A. immediately refer him to the prescribing practitioner
B. remake the lenses
C. re-verify the prescription for accuracy to include power, base curve, optical
center placement, segment height, vertex distance, proper frame fit
D. instruct the patient to wear the new glasses for about two weeks in order to
"get used to them"
C. re-verify the prescription for accuracy to include power, base curve, optical center
placement, segment height, vertex distance, proper frame fit
Open communication with the consumer's refractionist may reveal that:
1. new glasses cannot be expected to provide 20/20 vision
2. new glasses are expected to improve visual acuity
3. visual acuity is not a consideration
A. 1
B. 2
Answers, With Complete Verified Solution.
100% 2024
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
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
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
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
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
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
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
D. focus the eye piece
The lensometer reticle is divided into quadrants for the purpose of:
A. indicating the direction of the prism base
B. determining the cylinder axis
C. verifying the power in diopters
D. none of the above
A. indicating the direction of the prism base
FMLA refers to:
A. Family Medical Leave Act
B. Federally Mandated Lens Act
C. Federal Manufacturers Lens Association
D. Frame Manufacturer Labeling Act
A. Family Medical Leave Act
A patient enters your dispensary complaining of severe eye pain. What is your
first course of action?
A. check base curves and positioning of optical centers
B. perform follow-up keratometer readings
C. immediately refer to their eye doctor
D. re-align fit of adjustable nose pads
C. immediately refer to the eye doctor
The _______ is a non-governmental agency with functions to establish standards
for a wide variety of industrial and commercial interest.
A. American National Standard Institute (ANSI)
B. Occupational Safety and Health Administration (OSHA)
, C. Food and Drug Administration (FDA)
D. Federal Trade Commission (FTC)
A. American National Standard Institute (ANSI)
According to ANSI standards, a lens containing 0.25 diopters of cylinder must be
within _______ of the specified axis.
A. +- 2.0°
B. +- 3.0°
C. +- 5.0°
D. +- 7.0°
D. +- 7.0°
A lens containing over 1.50 diopters of cylinder must be within ______ of the
specified axis.
A. +- 2.0°
B. +- 3.0°
C. +- 5.0°
D. +- 7.0°
A. +- 2.0°
According to ANSI standards, the base curve received must be within ______ of
that specified.
A. +-0.25 D
B. +-0.50 D
C. +-0.75 D
D. +-1.00 D
C. +-0.75 D
Your patient insists that his visual acuity is sharper through his old glasses than
the new ones just delivered. What is the first thing you do?
A. immediately refer him to the prescribing practitioner
B. remake the lenses
C. re-verify the prescription for accuracy to include power, base curve, optical
center placement, segment height, vertex distance, proper frame fit
D. instruct the patient to wear the new glasses for about two weeks in order to
"get used to them"
C. re-verify the prescription for accuracy to include power, base curve, optical center
placement, segment height, vertex distance, proper frame fit
Open communication with the consumer's refractionist may reveal that:
1. new glasses cannot be expected to provide 20/20 vision
2. new glasses are expected to improve visual acuity
3. visual acuity is not a consideration
A. 1
B. 2
