Question
Wed November 16, 2011 By:

how much times the lens increases the power of the eye with the help of an spectacle?

Expert Reply
Wed November 23, 2011
every time your glasses prescription increases or decreases by a power of 2, your contact lens prescription will increase by an additional power of +0.25. For every power change of 2 in a glasses prescription, the difference of +0.25 power is needed to compensate for the location of the contact lens.
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