How to measure vision anomalies?

The degree of myopia or any other refractive error (hyperopia, astigmatism, presbyopia) is measured in dioptres.

It depends on the power of the corrective lens that needs to be placed in front of the eye to achieve the best visual acuity, bearing in mind that the fateful 10/10 will not be reached by everyone!!!

Our eyes are all different; some of us see better than others, some can even read characters smaller than 10/10, and can reach 20/10!! On the other hand, others see no better than 3 or 2/10, sometimes even less… 

Some of us run faster than others; some are even Olympic champions, while others are disabled.

The same applies to the eyes, and unfortunately, with age, we run less fast and see less well, even if we benefit from the most sophisticated surgical techniques for cataract, myopia, or other operations.