Prepare for your Contact Lens Registry Exam (CLRE) to become a Certified National Contact Lens Examiner (NCLE). Review the ABO Exam Handbook for all of the details. See National Opticianry Certification Exam (ABO) exam material here.

Preparing for your exams can be intimidating so we’ve prepared a list of resources (some paid and some free) to help you learn the formulas, standards, calculations, definitions and everything else you’ll need to know to pass your test.


Contact Lens Society of America’s Contact Lens ManualContact Lens Society of America’s Contact Lens Manual, Vol IA Comprehensive Study and Reference Guide, Volume I, revised in 2016, encompasses the basic fundamentals of contact lens technology. The manual guides the contact lens professional from the basics of anatomy and physiology, optics and instrumentation, through the fitting, verification, and evaluation of soft and gas permeable contact lenses. It also includes chapters on, aspheric and toric contact lenses, daily and extended wear lenses, as well as the management of presbyopia. This manual is recommended for those studying for the contact lens national certification, registry and state licensure examinations or those wishing to learn the fundamentals of contact lenses.

CLRE Secrets Study Guide: CLRE Exam Review for the Contact Lens Registry Examination: Our comprehensive study guide for the CLRE is written by our CLRE experts, who painstakingly researched the topics and the concepts that you need to know to do your best on the CLRE. Our original research into the Contact Lens Registry Examination (CLRE), offered by the National Contact Lens Examiners (NCLE), reveals the specific content areas and the essential skills that are critical for you to know on the CLRE. We’ve taken the information and developed a study guide that is guaranteed to help you be successful on the CLRE.

The Contact Lens Manual: A Practical Guide to Fitting: The Contact Lens Manual continues to meet the needs of a new generation of optometrists, dispensing opticians, contact lens practitioners and students who require clear and reliable information for fitting a complete range of contact lenses. The fourth edition of this best-selling classic, now in full colour throughout, provides the most up-to-date guidance in all aspects of today’s lenses in a practical and easy to use manual. Featuring new developments in lens types, care regimes, current practices, and electronic access to brand new video footage as well as a range of learning tools, this manual offers a complete package to help readers expand their lens knowledge, improve fitting and optimise patient care.

Contact Lens Fitting Guide: This book is a concise guide to contact lens fitting for optometrists and trainees. Beginning with an introduction to contact lenses and the pre-contact lens fitting eye examination, making sure a patient is suitable for wearing contact lenses, the following chapters describe the fitting of different types of corrective lens – soft, toric and rigid gas permeable. Separate chapters examine the use of therapeutic contact lenses, used to protect the eye whilst it heals after injury or infection, rather than to correct vision; and lenses for presbyopia, age-related long-sightedness.


Fitting Guide for Rigid and Soft Contact Lenses: A Practical Approach (4th Fourth Edition)




Optical Training Institute CLRE Preparation includes an all-in-one comprehensive course package with 6 workbooks and 6 audio CD’s contained in a carrying case.

Quantum Optical CLRE Staff Training Modules

CLRE Flashcard Study System: CLRE Test Practice Questions & Exam Review for the Contact Lens Registry Examination