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.
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.