ABO-NCLE PRACTICAL TEST EXAM 2025/2026 ACTUAL EXAM COMPLETE 80
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT ANSWERS)
ALREADY GRADED A+
Question 1
A patient presents with a condition where light rays focus in front of the retina because the globe
of the eye is too long or the refractive power is too strong. This condition is known as:
A) Hyperopia
B) Presbyopia
) Myopia
D) Astigmatism
E) Aphakia
Correct Answer: C) Myopia
Rationale: Myopia, or nearsightedness, occurs when the eye's refractive system is too
powerful relative to its length, causing light to converge before it reaches the retina. It is
corrected with minus (diverging) lenses.
Question 2
Which condition is characterized by a difficulty in accommodating due to the crystalline lens
becoming less elastic with age?
A) Amblyopia
B) Strabismus
C) Myopia
D) Presbyopia
E) Pseudophakia
Correct Answer: D) Presbyopia
Rationale: Presbyopia is an age-related condition where the crystalline lens loses its
flexibility, making it difficult for the eye to change its focal length to see objects at near.
This usually requires a "plus" add power for correction.
Question 3
In ophthalmic optics, what wavelength of light is primarily thought to contribute to the formation
of cataracts?
A) 320 nm
B) 400 nm
C) 460 nm
D) 550 nm
E) 700 nm
Correct Answer: C) 460 nm
Rationale: Short-wavelength blue light, specifically around the 460 nm range, is considered
high-energy visible (HEV) light. Prolonged exposure is linked to photochemical damage to
the crystalline lens, potentially leading to cataracts.
, 2
Question 4
An optician needs to turn or rotate a lens within a frame to align the cylinder axis correctly.
Which tool should be used?
A) Lens Caliper
B) Axis Pliers
C) Distometer
D) Polariscope
E) Tonometer
Correct Answer: B) Axis Pliers
Rationale: Axis pliers are specifically designed with protective pads to grip a lens securely
while it is in the frame, allowing the optician to rotate the lens to the correct prescribed axis
without scratching the surface.
Question 5
What are the standard refractive index and Abbe value for CR-39 (Plastic) lenses?
A) Index 1.523; Abbe 60
B) Index 1.58; Abbe 30
C) Index 1.49; Abbe 59
D) Index 1.54; Abbe 45
E) Index 1.60; Abbe 36
Correct Answer: C) Index 1.49; Abbe 59
Rationale: CR-39 is the standard plastic material used in optics. It has a refractive index of
approximately 1.49 and a high Abbe value of 59, meaning it has very low chromatic
aberration compared to higher index materials.
Question 6
Which lens material possesses a refractive index of 1.523 and an Abbe value of 60?
A) Polycarbonate
B) Trivex
C) Crown Glass
D) High Index 1.67
E) CR-39
Correct Answer: C) Crown Glass
Rationale: Crown Glass was the traditional standard for lenses. It is known for its superior
optical clarity (Abbe 60) and its specific refractive index of 1.523, which is the calibration
standard for most optical instruments.
Question 7
A patient requires a lens material that is lightweight and impact-resistant with an index of 1.54
and an Abbe value between 43 and 45. Which material is this?
A) Polycarbonate
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT ANSWERS)
ALREADY GRADED A+
Question 1
A patient presents with a condition where light rays focus in front of the retina because the globe
of the eye is too long or the refractive power is too strong. This condition is known as:
A) Hyperopia
B) Presbyopia
) Myopia
D) Astigmatism
E) Aphakia
Correct Answer: C) Myopia
Rationale: Myopia, or nearsightedness, occurs when the eye's refractive system is too
powerful relative to its length, causing light to converge before it reaches the retina. It is
corrected with minus (diverging) lenses.
Question 2
Which condition is characterized by a difficulty in accommodating due to the crystalline lens
becoming less elastic with age?
A) Amblyopia
B) Strabismus
C) Myopia
D) Presbyopia
E) Pseudophakia
Correct Answer: D) Presbyopia
Rationale: Presbyopia is an age-related condition where the crystalline lens loses its
flexibility, making it difficult for the eye to change its focal length to see objects at near.
This usually requires a "plus" add power for correction.
Question 3
In ophthalmic optics, what wavelength of light is primarily thought to contribute to the formation
of cataracts?
A) 320 nm
B) 400 nm
C) 460 nm
D) 550 nm
E) 700 nm
Correct Answer: C) 460 nm
Rationale: Short-wavelength blue light, specifically around the 460 nm range, is considered
high-energy visible (HEV) light. Prolonged exposure is linked to photochemical damage to
the crystalline lens, potentially leading to cataracts.
, 2
Question 4
An optician needs to turn or rotate a lens within a frame to align the cylinder axis correctly.
Which tool should be used?
A) Lens Caliper
B) Axis Pliers
C) Distometer
D) Polariscope
E) Tonometer
Correct Answer: B) Axis Pliers
Rationale: Axis pliers are specifically designed with protective pads to grip a lens securely
while it is in the frame, allowing the optician to rotate the lens to the correct prescribed axis
without scratching the surface.
Question 5
What are the standard refractive index and Abbe value for CR-39 (Plastic) lenses?
A) Index 1.523; Abbe 60
B) Index 1.58; Abbe 30
C) Index 1.49; Abbe 59
D) Index 1.54; Abbe 45
E) Index 1.60; Abbe 36
Correct Answer: C) Index 1.49; Abbe 59
Rationale: CR-39 is the standard plastic material used in optics. It has a refractive index of
approximately 1.49 and a high Abbe value of 59, meaning it has very low chromatic
aberration compared to higher index materials.
Question 6
Which lens material possesses a refractive index of 1.523 and an Abbe value of 60?
A) Polycarbonate
B) Trivex
C) Crown Glass
D) High Index 1.67
E) CR-39
Correct Answer: C) Crown Glass
Rationale: Crown Glass was the traditional standard for lenses. It is known for its superior
optical clarity (Abbe 60) and its specific refractive index of 1.523, which is the calibration
standard for most optical instruments.
Question 7
A patient requires a lens material that is lightweight and impact-resistant with an index of 1.54
and an Abbe value between 43 and 45. Which material is this?
A) Polycarbonate
