Myopia: Your degree of nearsightedness is mild-moderate level. Your contact lens prescription indicates this -3.50 OD (right), -3.75 OS (left). The BC is the base curve of contact which is the curvature measurement in milimeters of the back of the contact ( smaller the number the more curved or steeper your cornea). The diameter is how wide the contact is and how it will rest on your eye.
Answered 11/7/2015
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