In this short and intensive course you will learn the basics of essential refractive states (emmetropia, myopia, hyperopia, and astigmatism). More importantly, you will learn how these apply clinically to everyday life.

Presented in an animated way and using a variety of animations, Dr. Charles Boulet (DrB) and Robert Constantine (the VisionRehabOT take you on a journey of discovery beginning with short videos introducing you to basic principles, then a broader discussion on what refractive states mean to the individual patient (to us individually) and what correction with lenses means.

Course Curriculum

  Introduction to Refractive State
Available in days
days after you enroll

Hi, I’m Dr. Charles Boulet (BSc, BEd, OD)

Let me introduce you to the very basics of human vision - Refractive State. Over 40 minutes, you'll learn a load of practical information and insight into this very essential element of human vision: Optics. Learn about Myopia (Nearsightedness), Hyperopia (Farsightedness), Astigmatism ('toricity' or 'cylinder'), and more. This program offers multiple animations and illustrations of what lenses do and how they work.

In this discussion with Robert Constantine, the VisionRehabOT, we cover a lot of ground from some basic principles to the behavioural implications of corrected and uncorrected refractive states.

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Paid Course

Basics First

Dedicated descriptions and animations of basic refractive states: Emmetropia, Myopia, Hyperopia, and Astigmatism.

Animations and Illustrated Examples

Animations of basic principles make concepts easier to understand.


Watch the discussion on clinical implications for OT's and PT's with Robert Constantine, the VisionRehabOT.