how can I answer?

[peter123]

Hi there,
My friend asked me the following questions. If I have -5 diopter, how can I answer?

What's the power of your lens?

Thanks
pete

 

[Neillythere]

A diopter/dioptre is indeed the power of a lens:

Dioptre - Wikipedia, the free encyclopedia

A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres).

 

[Anglika]

Hi there,
My friend asked me the following questions. If I have -5 diopter, how can I answer?

What's the power of your lens?

Thanks
pete

It is not a question most people here expect to have to answer. They generally just know that their glasses are stronger than before. The specification is regarded as only important to the opticians.