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Introduc.DIr
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00064_Field_64.txt
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1997-10-29
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398b
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14 lines
LENS POWER
For spherical contact lenses the
power is specified in diopters just
as with spectacle lens powers. The
lens power for RGP lenses can be
measured on a lensometer just as
spectacles, the lens is held against
the lens stop. Hydrogel lenses
require that the water be blotted
off the surface before measuring
them in the same way.