This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Refractive errors are abnormalities in the way light from a distant object is focused - via convergence of rays at the convex cornea and lens - onto the retina.

Ametropia means literally without ideal focus, and is a blanket term referring to all refractive errors.

Treatment of refractive errors is with spectacles or contact lenses. Note that binocular single vision is prevented where there is an image size difference between the eyes of 8% - corresponding to 3 or 4 dioptres difference in spectacles. Thus, eyes that are this different warrant contact lenses.

Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.


Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.