California Optician Licensing Exam Test
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A
| Instant Download Pdf
1. What is the purpose of a lens with a plus (+) prescription?
A. To correct hyperopia
B. To correct myopia
C. To correct astigmatism
D. To block UV light
Rationale: A plus lens converges light and is used to correct farsightedness
(hyperopia).
2. The axis of a cylindrical lens indicates:
A. The power meridian
B. The location of the most power
C. The meridian with no cylinder power
D. The geometric center of the lens
Rationale: The axis is the orientation (0° to 180°) of the meridian without cylinder
power.
3. What is the average vertex distance used in optical calculations?
,A. 8 mm
B. 12 mm
C. 14 mm
D. 16 mm
Rationale: 12 mm is typically used as the standard vertex distance in refraction-to-
glasses conversion.
4. A myopic prescription would typically include:
A. Only plus sphere values
B. Minus sphere values
C. Cylindrical values only
D. Plano sphere values
Rationale: Myopia is corrected with minus lenses, which diverge light rays.
5. What is the base curve of a lens?
A. The curve on the back surface
B. The curve on the edge
C. The primary front surface curve
D. The bevel curve
Rationale: The base curve is the main curve on the front surface, crucial for optical
performance.
6. Which tool is used to verify lens power?
A. Lens clock
B. Thickness caliper
C. Lensometer
D. Pupilometer
, Rationale: A lensometer is used to verify sphere, cylinder, and axis of prescription
lenses.
7. A lens marked "+2.00 -1.00 x 090" has what spherical equivalent?
A. +2.00
B. +1.00
C. +1.50
D. +0.50
Rationale: Spherical equivalent = Sphere + ½ Cylinder = +2.00 + (-0.50) = +1.50.
8. What does ANSI stand for?
A. American National Spectacle Institute
B. American National Standards Institute
C. Association of National Safety Inspectors
D. American Network of Safety Instruments
Rationale: ANSI sets performance standards for optical and other industries.
9. California law requires opticians to register with:
A. The California Optometric Board
B. The Medical Board of California
C. The Board of Behavioral Sciences
D. The Department of Public Health
Rationale: The Medical Board of California oversees the registration and
regulation of opticians.
10.What is pantoscopic tilt?
Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A
| Instant Download Pdf
1. What is the purpose of a lens with a plus (+) prescription?
A. To correct hyperopia
B. To correct myopia
C. To correct astigmatism
D. To block UV light
Rationale: A plus lens converges light and is used to correct farsightedness
(hyperopia).
2. The axis of a cylindrical lens indicates:
A. The power meridian
B. The location of the most power
C. The meridian with no cylinder power
D. The geometric center of the lens
Rationale: The axis is the orientation (0° to 180°) of the meridian without cylinder
power.
3. What is the average vertex distance used in optical calculations?
,A. 8 mm
B. 12 mm
C. 14 mm
D. 16 mm
Rationale: 12 mm is typically used as the standard vertex distance in refraction-to-
glasses conversion.
4. A myopic prescription would typically include:
A. Only plus sphere values
B. Minus sphere values
C. Cylindrical values only
D. Plano sphere values
Rationale: Myopia is corrected with minus lenses, which diverge light rays.
5. What is the base curve of a lens?
A. The curve on the back surface
B. The curve on the edge
C. The primary front surface curve
D. The bevel curve
Rationale: The base curve is the main curve on the front surface, crucial for optical
performance.
6. Which tool is used to verify lens power?
A. Lens clock
B. Thickness caliper
C. Lensometer
D. Pupilometer
, Rationale: A lensometer is used to verify sphere, cylinder, and axis of prescription
lenses.
7. A lens marked "+2.00 -1.00 x 090" has what spherical equivalent?
A. +2.00
B. +1.00
C. +1.50
D. +0.50
Rationale: Spherical equivalent = Sphere + ½ Cylinder = +2.00 + (-0.50) = +1.50.
8. What does ANSI stand for?
A. American National Spectacle Institute
B. American National Standards Institute
C. Association of National Safety Inspectors
D. American Network of Safety Instruments
Rationale: ANSI sets performance standards for optical and other industries.
9. California law requires opticians to register with:
A. The California Optometric Board
B. The Medical Board of California
C. The Board of Behavioral Sciences
D. The Department of Public Health
Rationale: The Medical Board of California oversees the registration and
regulation of opticians.
10.What is pantoscopic tilt?
