• What should you avoid while taking drug;
• What are possible side effects;
• How should you take it.

The following information is from  from ‘Complete guide to Eyecare, Eyeglasses
 and contact lenses’   by Walter J. Zinn and Herbert Solomon. p79
A concave lens (for the nearsighted eye) is
written with a minus (- ) sign. If the prescription calls for a +2.00,
it's a 2 diopter lens for a farsighted eye, or it could be a 2
diopter reading lens for a presbyopic eye. A -2.50 is a 2 1/2
diopter lens for a nearsighted eye. The higher the number the
stronger the lens.
For an eye with astigmatism, the prescription might look like
this:
         -2.50 -1.00 axis 45
This is 2 1/2 diopters of nearsightedness with 1 diopter of
astigmatism. The axis indicates the orientation of the cylindrical
 part of the lens. It's based on the degrees of a protractor-
180 is the horizontal, 90 the vertical meridians. The axis can
be anywhere from 1 to 180.
A bifocal prescription will have additional numbers to indi-
cate the strength of the reading part of the lens.
              +1.75 -0.25 axis 95
                 add +1.50
This is 1 3/4 diopters of farsightedness with 1/4 diopter
astigmatism and an additional 1 1/2 diopters of power for reaing.

Sometimes a prism effect has to be incorporated into the pr
scription to deviate the light rays in a desired way.
              -3.25 -0.75 axis 70 2^ IN
The little triangular figure designates a prism and in this case
the direction of the base is inward, though it could be out, up or
down.
You need one more piece of information in order to read
your RX-knowing which numbers are for which eye. The right
eye is designated O.D. for the Latin oculus dexter; the left eye
is O.S. for oculus sinister. O.U. is oculus uterque, both eyes.
You may still not be thrilled about having to wear glasses,
but at least you now know what yon're wearing.

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