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. 2023 Apr 5;71(4):1142–1153. doi: 10.4103/IJO.IJO_2778_22

Table 2.

Different lens materials, their generic names, Dk value, contact angle, and refractive index (for scleral and corneal gas-permeable lenses)

Material name Generic name Dk value Contact angle (in degree) Refractive index
PMMA 0
 Boston II Itafocon A 12 20 1.47
 Boston ES Enflufocon A 18 52 1.44
 Boston IV Itafocon B 19 17 1.47
 Boston Equalens Itaflourofocon A 47 30 1.44
 Boston EO Enflufocon B 58 49 1.43
 Boston Equalens II Oprifocon A 85 30 1.42
 Boston XO Hexafocon A 100 49 1.42
 Boston XO2 Hexafocon B 141 38 1.42
Contamac
 Optimum Classic Roflufocon A 26 12 1.45
 Optimum Comfort Roflufocon C 65 6 1.44
 Optimum Extra Roflufocon D 100 3 1.43
 Optimum Extreme Roflufocon E 125 6 1.43
 Optimum Infinite Tisilfocon A 180 6 1.44