ABO NCLE EXAM AND PRACTICE EXAM NEWEST 2026
TEST BANK| COMPLETE 650 REAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) GRADED A+| ABO -NCLE EXAM 2026
(BRAND NEW!!)
Question 1
What is the effective power change of a +10.00 D lens when
moved 5 mm closer to the eye?
A) Becomes weaker
B) Becomes stronger
C) No change
D) Changes astigmatic effect
Correct Answer: B
*Rationale: Moving a plus lens closer to the eye increases its
effective power (more plus). This is clinically significant for
powers greater than ±4.00D. The effective power formula is Fe
1
,= F / (1 - dF), where d is the change in vertex distance in meters.
Here, moving 5mm closer (d = -0.005m if moving toward eye
from original position) increases plus power.*
Question 2
A lensometer reads -3.00 -1.00 x 180. What is the power in the
90° meridian?
A) -3.00 D
B) -4.00 D
C) -2.00 D
D) -1.00 D
Correct Answer: B
*Rationale: In minus cylinder form, power at the axis (180°)
equals the sphere power (-3.00D). The power perpendicular to
the axis (90°) equals sphere plus cylinder: -3.00 + (-1.00) = -
2
,4.00D. This is fundamental for understanding astigmatic
corrections.*
Question 3
Prism base direction: To correct exophoria at distance, you use:
A) Base in (BI)
B) Base out (BO)
C) Base up (BU)
D) Base down (BD)
Correct Answer: B
Rationale: Exophoria means the eyes have a tendency to drift
outward (temporal). Base-out prism stimulates convergence by
displacing the image nasally, requiring the eyes to turn inward to
maintain fusion. Base-in prism would worsen exophoria.
3
, Question 4
The Abbe value of a lens material indicates:
A) Specific gravity
B) Chromatic aberration
C) Impact resistance
D) UV cutoff
Correct Answer: B
*Rationale: Abbe value (V-number) measures dispersion. Lower
Abbe values (e.g., polycarbonate V=30) produce more
chromatic aberration (color fringing). Higher Abbe values (e.g.,
CR-39 V=58) produce less chromatic aberration. This is critical
for high-power prescriptions.*
Question 5
Which material has the highest impact resistance?
A) CR-39
4
TEST BANK| COMPLETE 650 REAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) GRADED A+| ABO -NCLE EXAM 2026
(BRAND NEW!!)
Question 1
What is the effective power change of a +10.00 D lens when
moved 5 mm closer to the eye?
A) Becomes weaker
B) Becomes stronger
C) No change
D) Changes astigmatic effect
Correct Answer: B
*Rationale: Moving a plus lens closer to the eye increases its
effective power (more plus). This is clinically significant for
powers greater than ±4.00D. The effective power formula is Fe
1
,= F / (1 - dF), where d is the change in vertex distance in meters.
Here, moving 5mm closer (d = -0.005m if moving toward eye
from original position) increases plus power.*
Question 2
A lensometer reads -3.00 -1.00 x 180. What is the power in the
90° meridian?
A) -3.00 D
B) -4.00 D
C) -2.00 D
D) -1.00 D
Correct Answer: B
*Rationale: In minus cylinder form, power at the axis (180°)
equals the sphere power (-3.00D). The power perpendicular to
the axis (90°) equals sphere plus cylinder: -3.00 + (-1.00) = -
2
,4.00D. This is fundamental for understanding astigmatic
corrections.*
Question 3
Prism base direction: To correct exophoria at distance, you use:
A) Base in (BI)
B) Base out (BO)
C) Base up (BU)
D) Base down (BD)
Correct Answer: B
Rationale: Exophoria means the eyes have a tendency to drift
outward (temporal). Base-out prism stimulates convergence by
displacing the image nasally, requiring the eyes to turn inward to
maintain fusion. Base-in prism would worsen exophoria.
3
, Question 4
The Abbe value of a lens material indicates:
A) Specific gravity
B) Chromatic aberration
C) Impact resistance
D) UV cutoff
Correct Answer: B
*Rationale: Abbe value (V-number) measures dispersion. Lower
Abbe values (e.g., polycarbonate V=30) produce more
chromatic aberration (color fringing). Higher Abbe values (e.g.,
CR-39 V=58) produce less chromatic aberration. This is critical
for high-power prescriptions.*
Question 5
Which material has the highest impact resistance?
A) CR-39
4
