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A patient presents a prescription reading OD -2.00 -1.50 x 180. What is the spherical equivalent of this lens?

-2.75 D

-3.50 D

-1.25 D

-0.50 D

to track

2026 Statistics

Key Facts: NOCE Exam

100

Total Questions

ABO-NCLE Candidate Handbook (2025)

2 hours

Exam Time

ABO-NCLE Candidate Handbook

~70%

Passing Score (Approx.)

ABO-NCLE (scaled scoring)

$225

Exam Fee

ABO-NCLE Candidate Handbook

27,500+

ABO-Certified Opticians

ABO-NCLE

Content Domains

ABO-NCLE Test Specifications

ABO-NCLE lists the NOCE as a 100-question, 2-hour multiple-choice exam administered at Prometric test centers or via ProProctor remote testing. The ABO-NCLE Candidate Handbook (February 2025) lists the exam fee at $225. ABO-NCLE uses scaled scoring with the passing score varying per administration. Eligibility requires a high school diploma or GED equivalent and a minimum age of 18.

Sample NOCE Practice Questions

Try these sample questions to test your NOCE exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A patient presents a prescription reading OD -2.00 -1.50 x 180. What is the spherical equivalent of this lens?

A.-2.75 D

B.-3.50 D

C.-1.25 D

D.-0.50 D

Explanation: The spherical equivalent is calculated by adding half the cylinder power to the sphere: -2.00 + (-1.50 / 2) = -2.00 + (-0.75) = -2.75 D. This calculation is used when converting to a spherical-only lens or for contact lens fitting adjustments.

2What does the 'axis' value in a spectacle prescription indicate?

A.The power of the cylindrical correction

B.The orientation of the cylindrical correction in degrees

C.The distance between the optical centers

D.The base curve of the lens

Explanation: The axis in a spectacle prescription indicates the orientation (in degrees from 1 to 180) at which the cylindrical correction is placed. It defines the meridian along which no cylindrical power is applied, positioning the cylinder at 90 degrees to the axis.

3Which lens material has the highest index of refraction among common ophthalmic materials?

A.CR-39 (n = 1.498)

B.Polycarbonate (n = 1.586)

C.1.74 high-index plastic

D.Trivex (n = 1.53)

Explanation: Among common ophthalmic lens materials, 1.74 high-index plastic has the highest index of refraction. A higher index means the lens can be made thinner for the same prescription power, making it ideal for strong prescriptions. CR-39 has the lowest index at 1.498.

4A lens with a power of +4.00 D has a focal length of:

A.4 cm

B.25 cm

C.40 cm

D.50 cm

Explanation: Focal length in meters equals 1 divided by the lens power in diopters: f = 1/D = 1/4.00 = 0.25 m = 25 cm. This fundamental optics formula is used to determine the focal point of any lens.

5Transposing the prescription +2.00 -3.00 x 090 yields:

A.-1.00 +3.00 x 180

B.+5.00 -3.00 x 180

C.-1.00 +3.00 x 090

D.+2.00 +3.00 x 180

Explanation: To transpose: (1) algebraically add the sphere and cylinder: +2.00 + (-3.00) = -1.00 new sphere; (2) change the cylinder sign: -3.00 becomes +3.00; (3) change the axis by 90 degrees: 090 becomes 180. Result: -1.00 +3.00 x 180.

6What is the Abbe value of polycarbonate lens material?

A.58

B.45

C.31

D.36

Explanation: Polycarbonate has an Abbe value of approximately 31, which is the lowest among common ophthalmic materials. A lower Abbe value means greater chromatic aberration (color fringing), especially noticeable in higher prescriptions. CR-39 and crown glass have an Abbe value around 58.

7A patient looks 8 mm below the optical center of a +3.00 D lens. Using Prentice's Rule, how much prism is induced?

A.2.4 prism diopters base down

B.2.4 prism diopters base up

C.0.24 prism diopters base down

D.24 prism diopters base down

Explanation: Prentice's Rule: P = cF, where c is decentration in centimeters and F is lens power. P = 0.8 cm x 3.00 D = 2.4 prism diopters. For a plus lens, looking below center induces base-up prism (the thickest part of the lens is above the gaze point).

8Which type of multifocal lens provides a gradual change in power from distance to near with no visible line?

A.Flat-top bifocal

B.Executive bifocal

C.Progressive addition lens (PAL)

D.Round-segment trifocal

Explanation: A progressive addition lens (PAL) provides a smooth, continuous gradient of increasing plus power from the distance zone through the intermediate corridor to the near zone, without any visible dividing lines. This cosmetic advantage makes PALs the most popular multifocal design.

9What is the primary advantage of Trivex lens material over polycarbonate?

A.Trivex is thinner

B.Trivex has better optical clarity (higher Abbe value)

C.Trivex is less expensive

D.Trivex is available in a wider range of indices

Explanation: Trivex has an Abbe value of 43-45, significantly higher than polycarbonate's 31. This means Trivex produces less chromatic aberration and better optical clarity. Trivex also offers excellent impact resistance and is lighter than polycarbonate, though polycarbonate is generally thinner due to its higher index (1.586 vs 1.53).

10The add power in a bifocal prescription refers to:

A.The additional minus power needed for near vision

B.The additional plus power added to the distance Rx for near vision

C.The total power of the near segment

D.The difference between the two eyes' prescriptions

Explanation: The add power (addition) is the additional plus power added to the distance prescription to compensate for the loss of accommodation, allowing the patient to focus at near. It is always a plus value and increases with age as accommodation decreases.

About the NOCE Exam

The NOCE is the national certification exam for dispensing opticians administered by the American Board of Opticianry (ABO). It evaluates knowledge and skills required for competency in ophthalmic dispensing, including prescription interpretation, lens selection, frame fitting, and patient communication.

Questions

100 scored questions

Time Limit

2 hours

Passing Score

Scaled score (approximately 70%)

Exam Fee

$225 (ABO (American Board of Opticianry) / Prometric)

NOCE Exam Content Outline

25%

Ophthalmic Optics

Terminology, prescriptions, lens characteristics, lens powers and formulas, lens types, materials, base curve effects, prism calculations, and measurement systems

10%

Ocular Anatomy, Physiology, Pathology & Refraction

Eye structure and function, common ocular pathology, and refractive errors including myopia, hyperopia, astigmatism, and presbyopia

20%

Ophthalmic Products

Frames, lenses, lens coatings, tints, low vision aids, preassembled eyewear, and safety eyewear products

15%

Instrumentation

Use of lensometers, keratometers, pupillometers, lens clocks, calipers, distometers, and other dispensing instruments

20%

Dispensing Procedures

Patient history, facial measurements (PD, seg height, vertex distance), frame selection, fitting, adjusting, troubleshooting, and patient communication

10%

Laws, Regulations & Standards

ANSI Z87.1 safety standards, ANSI Z80.1 tolerances, FDA regulations, OSHA requirements, HIPAA, CPT coding, and universal precautions

How to Pass the NOCE Exam

What You Need to Know

Passing score: Scaled score (approximately 70%)
Exam length: 100 questions
Time limit: 2 hours
Exam fee: $225

Keys to Passing

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

NOCE Study Tips from Top Performers

1Focus on Ophthalmic Optics first — at 25% of the exam, it is the highest-weighted domain covering prescriptions, lens powers, prism, and formulas

2Master Prentice's Rule, transposition, and vertex distance compensation as these are frequently tested calculation topics

3Learn the properties of every common lens material (CR-39, polycarbonate, Trivex, high-index) including index, Abbe value, and impact resistance

4Practice using a lensometer to verify prescriptions — Instrumentation questions at 15% often test practical lensometer skills

5Study ANSI Z87.1 safety standards and ANSI Z80.1 tolerances as they appear across both Instrumentation and Laws/Regulations domains

Frequently Asked Questions

How many questions are on the NOCE exam?

The ABO-NCLE Candidate Handbook (February 2025) lists the NOCE as a 100-question multiple-choice exam. Some older references cite 125 questions, but the current specification is 100 questions across six content domains.

What score do I need to pass the NOCE?

ABO-NCLE uses scaled scoring, and the passing score varies per exam administration. Multiple sources indicate the approximate passing threshold is around 70%. Candidates receive results immediately after completing the computer-based exam.

How much does the NOCE exam cost in 2026?

The NOCE exam fee is $225, payable by credit card at the time of online registration. The combined NOCOP exam (NOCE + ABOP Practical) costs $250. Exam fees are non-refundable per ABO-NCLE policy.

What are the eligibility requirements for the NOCE?

Candidates must have a high school diploma, GED, or equivalent. An exception may apply for high school students enrolled in dual programs. If your state has different requirements, the state licensing board requirements supersede ABO-NCLE requirements.

When can I take the NOCE exam?

The NOCE is offered in quarterly testing windows (January-March, April-June, July-September, October-December). It is administered at over 300 Prometric test centers nationwide or via ProProctor remote proctoring. Registration typically closes about two weeks before the end of each window.

What happens if I fail the NOCE?

If you do not pass, you must wait at least 14 days before registering to retake the exam. You have up to three attempts. After a third unsuccessful attempt, you must wait 90 days before becoming eligible again. Each retake requires a new $225 registration and fee.

Which NOCE content domain has the most questions?

Ophthalmic Optics is the largest domain at 25% (25 questions), followed by Ophthalmic Products and Dispensing Procedures at 20% each (20 questions each). Together these three domains account for 65% of the exam.