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FDA classification of soft contact lens materials[1]
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

References

  1. ^ Stretton, Serina (October 2004). "Should Silicone Hydrogels be Placed in a Separate FDA Soft Contact Lens Category?". siliconehydrogels.org. Retrieved 3 September 2020.

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