How do I read a glasses prescription?
A prescription is made up of a number of parts. Sph or sphere is
usually the first number and will either have a plus (+) or a
minus sign (-). On prescriptions for people with an astigmatism there will also be a cyl or
cylinder component. This is usually a number with a minus sign (-) and
an axis (number 0 to 180 with an "x" preceding it). For people who
require a reading prescription, there may also be an 'add' which is
usually a number with a plus sign between +0.75 to +3.00.
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