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| FDA lens group | Adopted name | Transmissibility level
(Dk x10-11) |
Water content | Chemical composition |
|---|---|---|---|---|
| I non-ionic low water content |
galyfilcon A | 60 | 47% | – |
| lotrafilcon A | 140 | 24% | DMA, siloxane, TRIS | |
| lotrafilcon B | 110 | 33% | ||
| polymacon | 7.5 | 36% | HEMA | |
| tetrafilcon | 9.0 | 43.5% | HEMA, MMA, NVP | |
| II non-ionic high water content |
alphafilcon A | 22.9 | 66% | HEMA, NVP |
| hilafilcon A | 26.9 | 70% | ||
| omafilcon A | 19.6 | 62% | HEMA, PC | |
| III ionic low water content |
balafilcon A | 99 | 36% | NCVE, NVP, PBVC, TPVC |
| bufilcon A | 16.0 | 45% | DA, HEMA, MAA | |
| IV ionic high water content |
etafilcon A | 17.0 | 58% | HEMA, MAA |
| ocufilcon D | 19.7 | 55% | ||
| vifilcon A | 16.0 | 55% | HEMA, MAA, PVP | |
DA – diacetone acrylamide; DMA – N,N-dimethylacrylamide; HEMA – 2-Hydroxyethyl methacrylate; MAA – methacrylic acid; MMA – methyl methacrylate; NCVE – N-carboxl vinyl ester; NVP – N-vinyl pyrrolidone; PBVC – poly[dimethylsiloxyl] di[silybutanol] bis[vinyl carbamate]; PC – phosphorylcholine; TPVC – tris-(trimethylsiloxysilyl) propylvinyl carbamate; TRIS – tris-(hydroxylmethyl) aminomethane | ||||
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Taney Court (1836–1864)
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