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Exam Review

Key Facts: NOCE / ABO Basic Exam

64.0%

2024 ABO Basic Pass Rate

ABO-NCLE Basic Certification page

125

Total Exam Items

ABO-NCLE basic exam materials

2 hours

Exam Duration

ABO-NCLE Basic Exam Handbook, July 2026

$275

Exam Fee

ABO-NCLE exam registration page, October-December 2026

3 years

Certification Renewal Cycle

ABO-NCLE Basic Certification page

The NOCE / ABO Basic exam is a two-hour computer-based optician certification exam with 125 multiple-choice questions, a portion of which may not be scored; the test specifications list 100. The fee is $275, candidates need a high school diploma or GED, ABO-NCLE reported a 64.0% ABO Basic pass rate for 2024, and certification renews every three years.

Sample NOCE / ABO Basic Practice Questions

Try these sample questions to review concepts for the NOCE / ABO Basic exam. 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 x 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 x 4.00 = 2.0 prism diopters.

2What is the spherical equivalent of a prescription -3.00 -1.50 x 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 x 90.

A.+3.75 -1.25 x 180

B.+3.75 -1.25 x 90

C.+1.25 -1.25 x 180

D.+2.50 -1.25 x 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 deg: 90 + 90 = 180. The result is +3.75 -1.25 x 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 x -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 out (temporal)

B.5 mm in (nasal)

C.0.5 mm out (temporal)

D.0.5 mm in (nasal)

Explanation: Using Prentice's Rule: c = P/F = 3/6 = 0.5 cm = 5 mm. For a PLUS lens the prism base follows the direction of decentration, so to create base-out prism the optical center must be decentered outward (temporally) by 5 mm.

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. Flat-top (D-segment) designs minimize image jump because the segment optical center sits only about 5 mm below the segment line; round-top segments cause more jump because the segment optical center is far below the line.

10What is the prismatic effect at the reading level of a bifocal with a +2.00 D distance lens if the reading level is 8 mm below the distance optical center?

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 x F = 0.8 cm x 2.00 D = 1.6 prism diopters. The reading level is below the optical center of a plus lens, so the prism is base-up: a plus lens is thickest at its optical center. This prism comes from the distance lens power, not from the add.

About the NOCE / ABO Basic Exam

The National Opticianry Competency Examination (NOCE), also called the ABO Basic Exam, validates entry-level spectacle dispensing competency. It covers ophthalmic optics, ocular anatomy and refraction, ophthalmic products, instrumentation, dispensing procedures, and law/standards for opticians.

Exam sponsor: American Board of Opticianry & National Contact Lens Examiners (ABO-NCLE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

125 questions

Time Limit

2 hours

Passing Score

Criterion-referenced passing standard set with the Modified Angoff Method

Exam / Certification Fees

$275

Exam sponsor website

Reported exam pass rate: 64.0%. ABO-NCLE published 2024 ABO Basic pass rate This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Ophthalmic Optics

Prescription interpretation, transposition, lens powers, prism, formulas, and optical troubleshooting.

10%

Ocular Anatomy, Physiology, Pathology, and Refraction

Eye structures, refractive errors, presbyopia, pathology recognition, and scope-aware referral cues.

20%

Ophthalmic Products

Lens materials, coatings, multifocal and progressive designs, frame materials, safety products, and product selection.

15%

Instrumentation

Lensmeter, lens clock, PD tools, frame tools, measurement devices, and verification workflow.

20%

Dispensing Procedures

Patient history, needs analysis, measurements, fitting, adjustment, troubleshooting, and patient education.

10%

Laws, Regulations, and Standards

FDA impact resistance, FTC Eyeglass Rule, OSHA safety eyewear, ANSI-style tolerance awareness, records, and ethics.

Preparing for the NOCE / ABO Basic Exam

What You Need to Know

Passing score: Criterion-referenced passing standard set with the Modified Angoff Method
Exam length: 125 questions
Time limit: 2 hours
Exam / certification fees: $275 Official sources

Using Our Practice Resources

Work through all 200 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

NOCE / ABO Basic: Suggested Study Strategy

1Start with the official ABO-NCLE handbook and blueprint before using third-party summaries.

2Spend extra time on optics math, prism, transposition, and verification because weak math causes cascading dispensing errors.

3Practice with lensmeter, PD, segment height, frame fitting, and adjustment scenarios rather than memorizing definitions alone.

4Keep an error log organized by the six NOCE domains so review time follows the official blueprint.

5Take two-hour timed mixed sets before the appointment so pacing, calculation setup, and question triage are rehearsed.

Frequently Asked Questions

How many questions are on the NOCE / ABO Basic exam?

ABO-NCLE's handbook gives 125 multiple-choice questions and says a portion may not be scored because they are pretested for future exams. The NOCE test specifications list 100 questions.

How long is the NOCE exam?

The current ABO-NCLE Basic Exam Handbook describes the basic exams as two-hour multiple-choice examinations delivered through Prometric test centers or ProProctor remote testing.

What score do I need to pass the NOCE?

ABO-NCLE uses a criterion-referenced passing standard and the Modified Angoff Method. It does not publish a simple raw percentage such as 70%, so candidates should prepare to meet the competency standard across all blueprint domains.

How much does the NOCE cost?

ABO-NCLE's registration page lists the exam fee as $275 from October 1, 2026, paid by credit card during online registration. The July 2026 handbook still shows the earlier $225. Exam fees are non-refundable under ABO-NCLE policy.

What are the NOCE exam domains?

The NOCE test specifications cover Ophthalmic Optics 25%, Ocular Anatomy/Physiology/Pathology/Refraction 10%, Ophthalmic Products 20%, Instrumentation 15%, Dispensing Procedures 20%, and Laws/Regulations/Standards 10%.

What is the NOCE pass rate?

ABO-NCLE published a 64.0% pass rate for the ABO Basic Exam in 2024. That statistic describes a candidate cohort and does not guarantee the result for any individual candidate.