Shamir Spectrum SV Single Vision CR-39 Lenses
Shamir Spectrum SV Single Vision CR-39 Lenses combine digital freeform calculations and an aspheric, atoric back surface with CR-39 plastic for a single-vision lens design.
Single-vision correction focuses on the prescribed range, such as distance or reading. Its digital freeform surface supports clear distance or reading vision. CR-39 plastic offers clear optical performance in a familiar standard-index material. The result balances lens design and material for comfortable day-to-day wear.

