3.2 How to Read a Contact Lens Description:
Description
This article is from the Vision and Eye Care FAQ, by grants@research.canon.com.au (Grant Sayer) with numerous contributions by others.
3.2 How to Read a Contact Lens Description:
A contact lens prescription differs from a spectacle prescription primarily
by the addition of lens parameters. It should be noted that the power of a
contact lens will not necessarily be the same as that of a spectacle
prescription due to the optics of a lens being closer to the eye. The
technical term is "effectivity" of the lens.
The other information that is often given with a contact lens prescription
will be the diameter of the lenses, basecurve, possibly additional curves
lens material, design or manufacturer name.
For example,
OD: 8.6/14.0/-1.00DS
OS: 8.6/14.0/-1.50DS
The data is
BaseCurve: 8.6mm
Diameter: 14.0mm
Power: -1.00D and -1.50
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