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00064_Field_64.txt
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1997-10-28
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398b
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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.