ABO ADVANCED OPHTHALMIC OPTICS
CERTIFICATION EXAM QUESTIONS
AND ANSWERS 100% VERIFIED. JUST
RELEASED
1. A patient is wearing a -10.00 D sphere lens at a 12mm vertex distance. If the new frame sits
at a 17mm vertex distance, what is the compensated power required to maintain the same
effective power at the cornea?
A. -11.25 D
B. -10.50 D
C. -9.52 D
D. -9.10 D
Answer: C
Conceptual Explanation: Using the formula Fc = F / (1 - dF), where d is the change in
meters (0.005m). A minus lens moved further from the eye becomes stronger in effect, so a
weaker lens is needed to compensate. -10 / (1 - (0.005 * -10)) = -.05 = -9.52 D.
2. Which of the following describes the ‘Law of Reflection’ correctly?
A. The angle of incidence is half the angle of reflection.
B. The angle of incidence plus the angle of reflection equals 90 degrees.
,C. The angle of incidence is equal to the angle of reflection.
D. The angle of reflection is determined by the refractive index.
Answer: C
Conceptual Explanation: The Law of Reflection states that the angle of incidence equals
the angle of reflection, both measured from the normal to the surface.
3. According to ANSI Z80.1-2020 standards, what is the cylinder power tolerance for a lens
with a cylinder power of 0.75 D?
A. +/- 0.13 D
B. +/- 0.12 D
C. +/- 0.15 D
D. +/- 0.18 D
Answer: A
Conceptual Explanation: For cylinder powers less than or equal to 2.00 D, the ANSI Z80.1
tolerance is +/- 0.13 D.
4. A pair of glasses has a +4.00 D sphere OD and a +1.00 D sphere OS. If the wearer looks
10mm below the optical centers, how much vertical induced prism is created and in which
direction?
A. 5.0 prism diopters Base Up OD
B. 3.0 prism diopters Base Down OD
, C. 3.0 prism diopters Base Up OD
D. 5.0 prism diopters Base Down OD
Answer: C
Conceptual Explanation: Prentice’s Rule: P = c x F. OD: 1cm x 4D = 4 BD. OS: 1cm x 1D = 1
BD. Net vertical imbalance is 4 - 1 = 3 prism diopters. Since the OD has more BD, it is
effectively 3 prism diopters BU relative to OS.
5. Which lens design uses a varying base curve across the lens surface to reduce off-axis
astigmatism and power errors?
A. Spherical
B. Bifocal
C. Plano
D. Aspheric
Answer: D
Conceptual Explanation: Aspheric lenses are designed with non-spherical surfaces to
reduce peripheral aberrations like marginal astigmatism.
6. When dispensing a high-index lens, which of the following is most likely to increase due to
the lower Abbe value?
A. Magnification
B. Refractive Power
CERTIFICATION EXAM QUESTIONS
AND ANSWERS 100% VERIFIED. JUST
RELEASED
1. A patient is wearing a -10.00 D sphere lens at a 12mm vertex distance. If the new frame sits
at a 17mm vertex distance, what is the compensated power required to maintain the same
effective power at the cornea?
A. -11.25 D
B. -10.50 D
C. -9.52 D
D. -9.10 D
Answer: C
Conceptual Explanation: Using the formula Fc = F / (1 - dF), where d is the change in
meters (0.005m). A minus lens moved further from the eye becomes stronger in effect, so a
weaker lens is needed to compensate. -10 / (1 - (0.005 * -10)) = -.05 = -9.52 D.
2. Which of the following describes the ‘Law of Reflection’ correctly?
A. The angle of incidence is half the angle of reflection.
B. The angle of incidence plus the angle of reflection equals 90 degrees.
,C. The angle of incidence is equal to the angle of reflection.
D. The angle of reflection is determined by the refractive index.
Answer: C
Conceptual Explanation: The Law of Reflection states that the angle of incidence equals
the angle of reflection, both measured from the normal to the surface.
3. According to ANSI Z80.1-2020 standards, what is the cylinder power tolerance for a lens
with a cylinder power of 0.75 D?
A. +/- 0.13 D
B. +/- 0.12 D
C. +/- 0.15 D
D. +/- 0.18 D
Answer: A
Conceptual Explanation: For cylinder powers less than or equal to 2.00 D, the ANSI Z80.1
tolerance is +/- 0.13 D.
4. A pair of glasses has a +4.00 D sphere OD and a +1.00 D sphere OS. If the wearer looks
10mm below the optical centers, how much vertical induced prism is created and in which
direction?
A. 5.0 prism diopters Base Up OD
B. 3.0 prism diopters Base Down OD
, C. 3.0 prism diopters Base Up OD
D. 5.0 prism diopters Base Down OD
Answer: C
Conceptual Explanation: Prentice’s Rule: P = c x F. OD: 1cm x 4D = 4 BD. OS: 1cm x 1D = 1
BD. Net vertical imbalance is 4 - 1 = 3 prism diopters. Since the OD has more BD, it is
effectively 3 prism diopters BU relative to OS.
5. Which lens design uses a varying base curve across the lens surface to reduce off-axis
astigmatism and power errors?
A. Spherical
B. Bifocal
C. Plano
D. Aspheric
Answer: D
Conceptual Explanation: Aspheric lenses are designed with non-spherical surfaces to
reduce peripheral aberrations like marginal astigmatism.
6. When dispensing a high-index lens, which of the following is most likely to increase due to
the lower Abbe value?
A. Magnification
B. Refractive Power
