200+ Free ABO/NCLE Practice Questions

Pass your ABO NCLE National Opticianry Competency Exam exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

~65-70% Pass Rate

200+ Questions

100% Free

1 / 200

Question 1

Score: 0/0

Using Prentice's Rule, what is the induced prism when a +4.00 D lens is decentered 5 mm?

1.0 prism diopter

1.5 prism diopters

2.0 prism diopters

2.5 prism diopters

to track

2026 Statistics

Key Facts: ABO/NCLE Exam

~65-70%

Est. Pass Rate

ABO/NCLE historical estimate

~70% (scaled)

Passing Score

American Board of Opticianry (ABO)

150

Exam Questions

American Board of Opticianry (ABO)

2 hours 30 minutes

Exam Duration

American Board of Opticianry (ABO)

$175 per exam (ABO and NCLE separate)

Exam Fee

American Board of Opticianry (ABO)

The ABO NCLE National Opticianry Competency Exam has 150 questions in 2 hours 30 minutes, requiring ~70% (scaled) to pass. The estimated pass rate is ~65-70%. The ABO and NCLE certifications validate competency in dispensing eyeglasses (ABO) and contact lenses (NCLE). Exams cover optical principles, lens types, frame fitting, contact lens fitting, ocular anatomy, and patient communication.

Sample ABO/NCLE Practice Questions

Try these sample questions to test your ABO/NCLE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1Using Prentice's Rule, what is the induced prism when a +4.00 D lens is decentered 5 mm?

A.1.0 prism diopter

B.1.5 prism diopters

C.2.0 prism diopters

D.2.5 prism diopters

Explanation: Prentice's Rule states that P = c × F, where P is prism in diopters, c is decentration in centimeters, and F is lens power in diopters. Converting 5 mm to cm gives 0.5 cm. Therefore: P = 0.5 × 4.00 = 2.0 prism diopters.

2What is the spherical equivalent of a prescription -3.00 -1.50 × 180?

A.-3.50 D

B.-3.75 D

C.-4.00 D

D.-4.25 D

Explanation: The spherical equivalent is calculated by taking half of the cylinder power and adding it to the sphere: -3.00 + (-1.50/2) = -3.00 + (-0.75) = -3.75 D. This represents the average power of the lens across all meridians.

3Convert the following plus cylinder prescription to minus cylinder form: +2.50 +1.25 × 90.

A.+3.75 -1.25 × 180

B.+3.75 -1.25 × 90

C.+1.25 -1.25 × 180

D.+2.50 -1.25 × 90

Explanation: To transpose from plus to minus cylinder: 1) Add the sphere and cylinder: +2.50 + 1.25 = +3.75. 2) Change the cylinder sign to minus: -1.25. 3) Change the axis by 90°: 90 + 90 = 180. The result is +3.75 -1.25 × 180.

4A patient has a prescription of -8.00 D measured at a 12 mm vertex distance. If fitted with contact lenses (0 mm vertex distance), what is the approximate effective power?

A.-7.25 D

B.-7.50 D

C.-8.00 D

D.-8.50 D

Explanation: For vertex compensation with minus lenses, moving the lens closer to the eye requires less minus power. Using the vertex formula: F' = F/(1-dF), where d is the change in meters. F' = -8/(1-0.012×-8) = -8/1.096 = -7.30 D, approximately -7.25 D.

5Anisometropia refers to:

A.Equal refractive error in both eyes

B.Difference in refractive error between the two eyes

C.No refractive error in either eye

D.Progressive myopia in both eyes

Explanation: Anisometropia is a condition where there is a significant difference in refractive power between the two eyes, typically defined as a difference of 1.00 D or more in spherical equivalent. This can cause aniseikonia (unequal image sizes) and other visual problems.

6A patient requires 3 prism diopters base-out in the right eye. If using a +6.00 D lens, how far and in which direction should the optical center be moved?

A.5 mm in (nasal)

B.5 mm out (temporal)

C.0.5 mm in (nasal)

D.0.5 mm out (temporal)

Explanation: Using Prentice's Rule: c = P/F = 3/6 = 0.5 cm = 5 mm. To create base-out prism, the lens must be decentrated inward (nasally) so the thicker prism base is positioned toward the nose.

7What is the purpose of using slab-off prism in bifocal prescriptions?

A.To reduce vertical prism in the reading area for anisometropic patients

B.To increase cosmetic appeal of the lens

C.To reduce lens thickness

D.To improve distance vision

Explanation: Slab-off (or reverse slab-off) prism is used to compensate for differential vertical prism that occurs in the reading area of bifocals when there is anisometropia. This prevents vertical diplopia (double vision) when the patient looks down to read.

8In a progressive addition lens, what is the corridor?

A.The area of increasing power between distance and near zones

B.The peripheral area with unwanted astigmatism

C.The distance viewing area at the top

D.The near viewing area at the bottom

Explanation: The corridor (or progressive corridor) is the central channel in a PAL where the power gradually increases from the distance zone at the top to the full near addition at the bottom. The width and length of the corridor vary by design and affect adaptation.

9When a patient looks down through bifocal segments, unwanted prismatic effects may cause:

A.Image jump

B.Improved distance vision

C.Reduced lens thickness

D.Increased field of view

Explanation: Image jump occurs when the patient's line of sight crosses the top edge of the bifocal segment. The sudden change in power causes a prismatic displacement of the image, which can be disconcerting. Round-top segments minimize image jump compared to flat-top designs.

10What is the prismatic effect at the reading level of a +2.00 D add bifocal if the optical center of the distance portion is 8 mm above the segment top?

A.0.8 prism diopters base-down

B.1.6 prism diopters base-up

C.1.6 prism diopters base-down

D.No prismatic effect

Explanation: Using Prentice's Rule: P = c × F = 0.8 cm × 2.00 D = 1.6 prism diopters. Since the optical center is above the reading level, the prism at the segment is base-down (the lens is thickest at the bottom of the add).

About the ABO/NCLE Exam

The ABO and NCLE certifications validate competency in dispensing eyeglasses (ABO) and contact lenses (NCLE). Exams cover optical principles, lens types, frame fitting, contact lens fitting, ocular anatomy, and patient communication.

Questions

150 scored questions

Time Limit

2 hours 30 minutes

Passing Score

~70% (scaled)

Exam Fee

$175 per exam (ABO and NCLE separate) (American Board of Opticianry (ABO) / National Contact Lens Examiners (NCLE))

ABO/NCLE Exam Content Outline

25%

Clinical Knowledge & Assessment

Core knowledge, patient assessment, diagnostic interpretation, and clinical reasoning

25%

Patient Care & Procedures

Treatment protocols, procedural skills, pharmacology, and evidence-based interventions

20%

Safety & Compliance

Patient safety, infection control, regulatory standards, and quality assurance

15%

Professional Practice

Ethics, scope of practice, communication, and interdisciplinary collaboration

15%

Specialized Topics

Domain-specific advanced topics, emerging practices, and population-specific considerations

How to Pass the ABO/NCLE Exam

What You Need to Know

Passing score: ~70% (scaled)
Exam length: 150 questions
Time limit: 2 hours 30 minutes
Exam fee: $175 per exam (ABO and NCLE separate)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ABO/NCLE Study Tips from Top Performers

1Focus on the highest-weighted content areas first — they represent the most exam questions

2Complete at least 200 practice questions and review explanations for every missed item

3Study in focused 1-2 hour blocks with active recall and spaced repetition

4Review clinical guidelines and evidence-based practice standards relevant to this credential

5Take at least two full-length timed practice exams before your scheduled test date

Frequently Asked Questions

What is the ABO/NCLE exam passing score?

The ABO NCLE National Opticianry Competency Exam requires a score of ~70% (scaled) to pass. The exam has 150 questions in 2 hours 30 minutes. The estimated pass rate is ~65-70%.

How hard is the ABO/NCLE exam?

The ABO NCLE National Opticianry Competency Exam is considered moderately challenging with an estimated pass rate of ~65-70%. Candidates with clinical experience and structured study plans typically perform well. Plan for 60-120 hours of dedicated study.

How long should I study for the ABO/NCLE?

Most candidates study for 6-12 weeks, investing 60-120 hours. Focus on content areas with the highest exam weight, complete practice questions, and review explanations for missed items.

What is the ABO/NCLE exam fee?

The exam fee is $175 per exam (ABO and NCLE separate). The exam is administered by American Board of Opticianry (ABO) / National Contact Lens Examiners (NCLE). Check the official website for the most current pricing and scheduling information.