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00077_Field_77.txt
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1997-10-28
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377b
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RGP CYLINDRICAL PRISM STABILIZED LENSES
Rigid prism stabilized lenses are
manufactured with the cylinder
generated on the front surface.
Prism ballasted lenses may be
truncated, that is a portion of the
edge is removed giving a 'flat' side
to the lens. This, in addition to the
prism, helps maintain rotational
stabilization of the lens.