ABO-NCLE PRACTICAL TEST EXAM 2025 ACTUAL EXAM
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT ANSWERS) ALREADY GRADED A+
Question 1
When performing lensometry on a progressive addition lens (PAL), what is the first power
reading typically taken?
A) The full add power.
B) The distance power.
C) The intermediate power.
D) The near power.
E) The prism reference point.
Correct Answer: B) The distance power
Rationale: When performing lensometry on a PAL, the distance power is typically
the first power reading taken, usually found by centering the lensometer target in
the distance reference point (DRP) or the fitting cross.
Question 2
What is the primary purpose of a "pantoscopic tilt" adjustment on a pair of spectacles?
A) To bring the optical centers closer together.
B) To adjust the temple length for comfort.
C) To ensure the optical axis of the lens is perpendicular to the wearer's line of sight.
D) To reduce the overall weight of the frame.
E) To change the frame's color.
Correct Answer: C) To ensure the optical axis of the lens is perpendicular to the
wearer's line of sight
Rationale: Pantoscopic tilt refers to the downward angle of the frame front relative
to the temples. Adjusting it ensures the optical axis of the lens is aligned with the
wearer's primary line of sight, preventing aberrations and ensuring proper vision.
Question 3
Which of the following lens materials is known for its excellent impact resistance and is
commonly used for safety glasses and children's eyewear?
A) Glass
B) CR-39 plastic
,C) Polycarbonate
D) Trivex
E) High-index plastic
Correct Answer: C) Polycarbonate
Rationale: Polycarbonate is a thermoplastic known for its superior impact resistance,
making it an excellent choice for safety glasses, sports eyewear, and children's
glasses.
Question 4
A patient requires a multifocal lens. They spend a significant amount of time working on a
computer and also need clear distance and near vision. Which type of lens would be most
appropriate?
A) Single vision distance lenses
B) Single vision near lenses
C) Traditional bifocals
D) Progressive addition lenses (PALs)
E) Executive bifocals
Correct Answer: D) Progressive addition lenses (PALs)
Rationale: PALs provide a seamless progression of powers from distance through
intermediate to near, offering clear vision at all distances without visible lines. This
makes them ideal for patients with varying visual demands like computer work,
reading, and driving.
Question 5
According to ANSI Z87.1 standards for safety eyewear, what is the minimum thickness
required for a dress or street-wear lens with a minimum diameter of 50mm, when not
specifically designated as impact resistant?
A) 1.0 mm
B) 1.5 mm
C) 2.0 mm
D) 2.2 mm
E) 3.0 mm
,Correct Answer: D) 2.2 mm
Rationale: ANSI Z87.1 standards specify that non-impact resistant lenses for dress or
street-wear, when not used as safety lenses, should have a minimum thickness of
2.2 mm if they have a minimum diameter of 50mm or greater. However, safety
lenses themselves have stricter thickness and impact resistance requirements.
Question 6
When measuring pupillary distance (PD), which method provides a more accurate
measurement for each eye individually?
A) Monocular PD measurement
B) Binocular PD measurement
C) Average PD measurement
D) Fixed PD measurement
E) Near PD measurement
Correct Answer: A) Monocular PD measurement
Rationale: Monocular PD measurement measures the distance from the center of
the bridge of the nose to the center of the pupil of each eye separately, providing a
more precise measurement for lens optical center placement than a single
binocular measurement.
Question 7
What is the purpose of applying a hard coat to a plastic lens?
A) To change the color of the lens.
B) To reduce reflections.
C) To make the lens more impact resistant.
D) To protect the lens surface from scratches.
E) To add UV protection.
Correct Answer: D) To protect the lens surface from scratches
Rationale: Plastic lenses are softer than glass and prone to scratching. A hard coat
(scratch-resistant coating) is applied to their surface to increase their durability and
resistance to abrasions.
, Question 8
When dispensing new spectacles, what is the most common reason for a patient to complain
about "swimming" or "fishbowl" effect?
A) Incorrect PD measurement.
B) Excessive base curve.
C) Incorrect frame size.
D) High cylinder power or axis.
E) Improper pantoscopic tilt.
Correct Answer: B) Excessive base curve
Rationale: An excessive or too steep base curve in a lens can induce peripheral
aberrations, causing a "swimming" or "fishbowl" sensation, where straight lines
appear curved and the wearer feels off-balance.
Question 9
How does an anti-reflective (AR) coating improve vision?
A) By making the lens lighter.
B) By blocking harmful UV rays.
C) By reducing reflections from the lens surfaces.
D) By increasing the impact resistance of the lens.
E) By adding color to the lens.
Correct Answer: C) By reducing reflections from the lens surfaces
Rationale: AR coatings are designed to minimize reflections off the front and back
surfaces of lenses, allowing more light to pass through to the eye, thus improving
visual clarity, reducing glare, and enhancing the aesthetic appearance of the lenses.
Question 10
Which of the following is NOT a common method for adjusting a plastic frame?
A) Heat box
B) Frame warmer
C) Hot salt pan
D) Pliers
E) Ultrasonic cleaner
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT ANSWERS) ALREADY GRADED A+
Question 1
When performing lensometry on a progressive addition lens (PAL), what is the first power
reading typically taken?
A) The full add power.
B) The distance power.
C) The intermediate power.
D) The near power.
E) The prism reference point.
Correct Answer: B) The distance power
Rationale: When performing lensometry on a PAL, the distance power is typically
the first power reading taken, usually found by centering the lensometer target in
the distance reference point (DRP) or the fitting cross.
Question 2
What is the primary purpose of a "pantoscopic tilt" adjustment on a pair of spectacles?
A) To bring the optical centers closer together.
B) To adjust the temple length for comfort.
C) To ensure the optical axis of the lens is perpendicular to the wearer's line of sight.
D) To reduce the overall weight of the frame.
E) To change the frame's color.
Correct Answer: C) To ensure the optical axis of the lens is perpendicular to the
wearer's line of sight
Rationale: Pantoscopic tilt refers to the downward angle of the frame front relative
to the temples. Adjusting it ensures the optical axis of the lens is aligned with the
wearer's primary line of sight, preventing aberrations and ensuring proper vision.
Question 3
Which of the following lens materials is known for its excellent impact resistance and is
commonly used for safety glasses and children's eyewear?
A) Glass
B) CR-39 plastic
,C) Polycarbonate
D) Trivex
E) High-index plastic
Correct Answer: C) Polycarbonate
Rationale: Polycarbonate is a thermoplastic known for its superior impact resistance,
making it an excellent choice for safety glasses, sports eyewear, and children's
glasses.
Question 4
A patient requires a multifocal lens. They spend a significant amount of time working on a
computer and also need clear distance and near vision. Which type of lens would be most
appropriate?
A) Single vision distance lenses
B) Single vision near lenses
C) Traditional bifocals
D) Progressive addition lenses (PALs)
E) Executive bifocals
Correct Answer: D) Progressive addition lenses (PALs)
Rationale: PALs provide a seamless progression of powers from distance through
intermediate to near, offering clear vision at all distances without visible lines. This
makes them ideal for patients with varying visual demands like computer work,
reading, and driving.
Question 5
According to ANSI Z87.1 standards for safety eyewear, what is the minimum thickness
required for a dress or street-wear lens with a minimum diameter of 50mm, when not
specifically designated as impact resistant?
A) 1.0 mm
B) 1.5 mm
C) 2.0 mm
D) 2.2 mm
E) 3.0 mm
,Correct Answer: D) 2.2 mm
Rationale: ANSI Z87.1 standards specify that non-impact resistant lenses for dress or
street-wear, when not used as safety lenses, should have a minimum thickness of
2.2 mm if they have a minimum diameter of 50mm or greater. However, safety
lenses themselves have stricter thickness and impact resistance requirements.
Question 6
When measuring pupillary distance (PD), which method provides a more accurate
measurement for each eye individually?
A) Monocular PD measurement
B) Binocular PD measurement
C) Average PD measurement
D) Fixed PD measurement
E) Near PD measurement
Correct Answer: A) Monocular PD measurement
Rationale: Monocular PD measurement measures the distance from the center of
the bridge of the nose to the center of the pupil of each eye separately, providing a
more precise measurement for lens optical center placement than a single
binocular measurement.
Question 7
What is the purpose of applying a hard coat to a plastic lens?
A) To change the color of the lens.
B) To reduce reflections.
C) To make the lens more impact resistant.
D) To protect the lens surface from scratches.
E) To add UV protection.
Correct Answer: D) To protect the lens surface from scratches
Rationale: Plastic lenses are softer than glass and prone to scratching. A hard coat
(scratch-resistant coating) is applied to their surface to increase their durability and
resistance to abrasions.
, Question 8
When dispensing new spectacles, what is the most common reason for a patient to complain
about "swimming" or "fishbowl" effect?
A) Incorrect PD measurement.
B) Excessive base curve.
C) Incorrect frame size.
D) High cylinder power or axis.
E) Improper pantoscopic tilt.
Correct Answer: B) Excessive base curve
Rationale: An excessive or too steep base curve in a lens can induce peripheral
aberrations, causing a "swimming" or "fishbowl" sensation, where straight lines
appear curved and the wearer feels off-balance.
Question 9
How does an anti-reflective (AR) coating improve vision?
A) By making the lens lighter.
B) By blocking harmful UV rays.
C) By reducing reflections from the lens surfaces.
D) By increasing the impact resistance of the lens.
E) By adding color to the lens.
Correct Answer: C) By reducing reflections from the lens surfaces
Rationale: AR coatings are designed to minimize reflections off the front and back
surfaces of lenses, allowing more light to pass through to the eye, thus improving
visual clarity, reducing glare, and enhancing the aesthetic appearance of the lenses.
Question 10
Which of the following is NOT a common method for adjusting a plastic frame?
A) Heat box
B) Frame warmer
C) Hot salt pan
D) Pliers
E) Ultrasonic cleaner
