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PRESCRIPTION OPTICAL LENSES FOR THE IST CORONA MASK. AVAILABLE IN A RANGE OF +/- DIOPTER STRENGTHS AND BI-FOCALS.
Lenses available in diopter from -1.0 to -8.0 in -0.5 decrements
and +1.0 to + 4.0 in 0.5 increments.
Bi-focal lenses can be fitted with diopters from +1 to +4 in 0.5 increments.
These lenses are Left and Right Specific.