It is possible to measure the
optical power of reading glasses in the form of diopters. Reading glasses with
diopters unit 2.00 holds the ability to refract light that are twenty inches
away.
Diopters unit 3.00 signifies the
ability to focus on objects that are 1 foot away. Most individuals require
reading glasses of different strengths as the ability of eye deteriorates with
the gradual passage of time.
In a bid to serve human purpose, strength of reading glasses, vary in
small increments. The common diopters strengths include 1.75, 150, 1.00, 1.22
and 3.00 as well. Individuals above forty years of age require glasses with
strength 1.25.
