You must fill this form out completely before
ordering your contacts. Thank-You.
on your prescription is a number, that starts with a + or -
sign. For example, +3.50, -2.75 etc. This is to correct either your
nearsightedness if it is a (-) sign or farsightedness if it is a (+) sign.
Base Curve, (BC) is a
measure of the curvature of the contact lens. This makes the lens fit more
comfortably on your cornea. Typically BC is in the range 8.3 to 9.0.
Diameter is a measure of
the size of the lens. Typically Diameter is in the range of 14.0 to 14.5.
Sometimes, a lens is manufactured in only one base curve or diameter. Your
optician may then have omitted this value on your prescription since it
makes no difference anyway.
The right eye is abbreviated OD, the left OS and both eyes are OU.
Cylinder (Cyl) Is the
strength of your astigmatism. If you have a number for cylinder on your
prescription you should look at our Toric Lenses. Typical numbers for
cylinder are -0.75, -1.00, -1.25.
Axis Is the orientation of
your astigmatism on your cornea. Typical numbers for Axis are 160°, 170°,
Add power is the second
power correction you need if you are wearing bifocal contact lenses. This
number refers to the reading strength of the lens. Typically addpower is
in the range of +1.00 to +2.50.
Colour is the colour of the
contact lens and is only needed if you are buying coloured or special
effect contact lenses. The colour does not affect your prescription in any