Optics
Front surface asphere consisting of multiple aspheric zones over a spherical base curve, with the most plus power in the center of the lens progressing to more minus in the periphery.
Add
Two strengths, Low +0.75D to +1.50D and High +1.75D to +2.50D.
Material
Balafilcon A, a copolymer of a silicone vinyl carbamate, N-vinyl-pyrrolidone, a siloxane crosslinker and a vinyl alanine wetting monomer.
Surface
Performa surface treatment, which transforms hydrophobic silicone to hydrophilic silicate.
Visibility tint
Blue, from up to 300 ppm of Reactive Blue Dye 246.
Note
The clinical results published for this lens were obtained with the PureVision contact lens, which has the same lens material but a different lens design.
