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Free ABO/NCLE Practice Questions

10 free, exam-style ABO-NCLE Basic Certification Exams (ABO/NCLE) practice questions with answers and explanations. No signup required. Work through them below, then take the full free ABO/NCLE practice test to study every exam domain.

These 10 free ABO/NCLE questions are organized by exam domain, so you can see how each part of the ABO-NCLE Basic Certification Exams blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: NOCE - Ophthalmic Optics (25 questions / 25%)

Question 1

A patient's spectacle Rx is -5.00 D. When the patient looks 6 mm below the optical center, the induced prismatic effect is:

  1. 0.30Δ base down
  2. 3.0Δ base up
  3. 3.0Δ base down
  4. 5.0Δ base down
Show answer & explanation

Correct answer: C - 3.0Δ base down

Question 2

A patient wearing new high-index lenses reports seeing colored fringes around objects, especially in peripheral gaze. This symptom is MOST directly related to which lens property?

  1. High specific gravity
  2. Low Abbe value
  3. High center thickness
  4. Low refractive index
Show answer & explanation

Correct answer: B - Low Abbe value

Question 3

A patient's Rx is OD -1.50 D and OS -5.00 D with lined bifocal lenses. To compensate for the vertical imbalance at the reading level, a slab-off (bicentric grind) should be applied to:

  1. The left lens, creating base-up prism
  2. The right lens, creating base-up prism
  3. The left lens, creating base-down prism
  4. The right lens, creating base-down prism
Show answer & explanation

Correct answer: A - The left lens, creating base-up prism

Domain 4: NOCE - Instrumentation (15 questions / 15%)

Question 4

When using a manual lensmeter to verify a spectacle lens, which step should be performed FIRST?

  1. Rotate the power drum to the expected value
  2. Dot the optical center on the lens surface
  3. Focus the eyepiece to the observer's eye
  4. Align the axis wheel to 180 degrees
Show answer & explanation

Correct answer: C - Focus the eyepiece to the observer's eye

Domain 6: NOCE - Laws, Regulations, and Standards (10 questions / 10%)

Question 5

According to ANSI Z80.1 standards for finished prescription lenses, the tolerance for cylinder axis becomes progressively TIGHTER as:

  1. Add power increases
  2. Sphere power increases
  3. Prism power increases
  4. Cylinder power increases
Show answer & explanation

Correct answer: D - Cylinder power increases

Domain 8: CLRE - Refractive Errors (5 questions / 5%)

Question 6

A patient's vertex-compensated Rx is -3.00 D. An RGP contact lens is fit 0.50 D steeper than flat K. Applying the SAM/FAP rule, the initial contact lens power should be:

  1. -3.50 D
  2. -2.50 D
  3. -3.00 D
  4. -4.00 D
Show answer & explanation

Correct answer: A - -3.50 D

Domain 10: CLRE - Prefitting (15 questions / 15%)

Question 7

Among the four FDA hydrogel contact lens material classification groups, which group has the HIGHEST tendency for protein deposit accumulation?

  1. Group I - low water content, non-ionic
  2. Group II - high water content, non-ionic
  3. Group III - low water content, ionic
  4. Group IV - high water content, ionic
Show answer & explanation

Correct answer: D - Group IV - high water content, ionic

Domain 11: CLRE - Diagnostic Fitting (11 questions / 11%)

Question 8

During an RGP contact lens evaluation with fluorescein, the fitter observes a bright green central pool, minimal movement on blink, and no visible peripheral edge lift. This pattern indicates:

  1. An alignment fit with adequate tear exchange
  2. A flat fit requiring a steeper base curve
  3. A with-the-rule astigmatic corneal pattern
  4. A steep fit requiring a flatter base curve
Show answer & explanation

Correct answer: D - A steep fit requiring a flatter base curve

Domain 12: CLRE - Dispensing (20 questions / 20%)

Question 9

A contact lens patient using a hydrogen peroxide disinfection system with a platinum catalytic disc reports severe stinging immediately upon inserting their lenses. The MOST likely cause is:

  1. An allergic reaction to the platinum disc material
  2. Incomplete neutralization due to shortened soak time
  3. Bacterial contamination of the storage case
  4. Incompatibility between the peroxide and the lens material
Show answer & explanation

Correct answer: B - Incomplete neutralization due to shortened soak time

Domain 13: CLRE - Follow-Up (20 questions / 20%)

Question 10

A contact lens patient presents with severe eye pain, photophobia, tearing, and a central white corneal infiltrate with an overlying epithelial defect. The contact lens fitter should:

  1. Discontinue lens wear and schedule follow-up in 48 hours
  2. Switch to a daily disposable lens and add lubricating drops
  3. Refer immediately to the prescribing doctor or emergency care
  4. Instill artificial tears, remove the lens, and recheck next day
Show answer & explanation

Correct answer: C - Refer immediately to the prescribing doctor or emergency care

The rest of the ABO/NCLE blueprint

The ABO/NCLE exam also covers these domains. Drill them in the full free practice test:

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