A word about strength (diopter). Reading glasses, or in this
case make-up glasses, all have a common misconception regarding the term strength. Strength
determines focal length not size. (it's similar to another common misconception, foot-pounds.
Foot-pounds is a unit of work, not weight, Or, light-year which is a unit of distance not time), but
then I digress, so back to focal length.
Non-prescription reading (or make-up) glasses have only one distance variable. Since the distance from
the actual eye to the glass is fixed (call it 1 inch), the distance from the glass to the object is the
only variable, and becomes the focal length. Now the focal length may vary somewhat from person to
person, but in general is as follows: 2x = 12 to 14 in; 2.5x = 10 to 12 in; 3x = 8 to 10 in; 3.5x = 6 to
8 in; and 4x = 4 to 6 in.
Now, the reality is that any strength would work for any person. It is simply a matter of finding the
correct focal length. Try it yourself, put the glasses on, close the opposite eye, hold your index
finger out at arms length, and slowly bring it in until it does focus. Wha-la, you've found your focal
length. It is simply a matter of establishing the correct focal length to establish a comfort zone.
Plain glass mirrors are recommended for use with the iMagic Make-up Glasses. We do not recommend the
use of magnifying mirrors due their inherent distortion.
