Certification Prep

ABO, CPO & NCLE exam resources and study materials

Free Assessment Tools

Which Exam Are You Preparing For?

Pick the certification below to get a personalized readiness score, category breakdown, and a study plan built around your weak areas.

ABO Weakness Finder

American Board of Opticianry exam prep — basic optics, lens design, dispensing, frames & more.

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CPO Weakness Finder

Certified Paraoptometric exam prep — ocular anatomy, visual acuity, refraction, instrumentation & patient care.

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NCLE Weakness Finder

National Contact Lens Examiners prep — contact lens materials, fitting, fluorescein patterns, care & complications.

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Certification Math Bootcamps

STOP MEMORIZING. START UNDERSTANDING.

Interactive mini-courses for the ABO, CPO & NCLE exams. Learn, practice, track your mastery, and build real confidence.

15+ lessons per course

Interactive practice & quizzes

Progress tracking & mastery scores

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ABO Bootcamp: Optical Math

~180 min · 15 lessons

Master the math. Build your confidence. Be ready for test day.

TranspositionSpherical EquivalentPrentice's RuleDecentration

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CPO Bootcamp: Optical Math

~180 min · 14 lessons

Master the optical calculations you need to understand for the CPO Certification Exam.

Diopters & Lens PowerReading Eyeglass PrescriptionsPrescription MathSpherical Equivalent

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NCLE Bootcamp: Contact Lens Math

~180 min · 17 lessons

Master the calculations behind contact lens fitting and prepare for the NCLE Certification Exam.

Contact Lens PrescriptionsLens PowerVertex DistanceVertex Calculations

Full-Length Exam Simulator

ABO Full-Length Practice Exam

Ready to put your knowledge to the test? Take a full-length, timed practice exam — then get a detailed breakdown of your strengths and weak spots.

Timed, full-length simulation

Detailed category breakdown

Review missed questions with explanations

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Unofficial OpticalToolbelt practice exam. Not affiliated with or endorsed by the American Board of Opticianry.

Certification Resources

ABO & CPO exam preparation and study materials

ABO Certification

American Board of Opticianry

The ABO certifies opticians in eyeglass dispensing through a comprehensive examination.

Requirements

•High school diploma or equivalent
•No formal education required (experience based)
•Pass the ABO examination

Exam Details

Questions150 multiple choice

Duration3 hours

Passing ScoreScaled score of 70%

Cost$125 (member) / $225 (non-member)

RenewalEvery 3 years, 18 CE credits

Exam Topics

Anatomy and physiology of the eye

Ophthalmic optics

Frame and lens materials

Dispensing procedures

Patient interaction

Regulations and standards

Study Flashcards

ABO Flashcards

105 cards

1 / 1050 known

Ocular Anatomy

What are the three layers of the eye?

Tap to reveal answer

Lensometer Simulation

Practice identifying prescriptions from the lensometer eyepiece — a common ABO exam skill.

Interactive Lensometer Simulation

Operate a real lensometer to verify prescriptions

Step 1: Set the Axis

Drag the axis dial to match the prescription axis. Mires are skewed until correct.

Step 2: Find Sphere Power

Drag the power drum until the 3 solid mires become sharp and clear.

Step 3: Find Cylinder

Continue spinning down to subtract cylinder — the 3 tightly-spaced perpendicular mires will clear.

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