A diopter is a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters.



Optical power of a healthy human eye is about 40 diopters, meaning the ability to focus on an object or image 1/40 of a meter from the eye. 



The eye of a typical young person can adjust an additional 20 diopters.



Lens power is measured in diopters. 



Leave a Reply

Your email address will not be published. Required fields are marked *