Sma

Hardness

Wettability

Gas transmissibility

Table 6 FDA Grouping for Soft Hydrophilic Lenses and Generic Names

Group I

Group 2

Group 3

Group 4

Low water

High water

Low water

High water

(<50% H20)

(>50% H20)

(<50% H20)

(>50% H20)

Nonionic polymers

Nonionic polymers

Ionic polymers

Ionic polymers

Tefilcon (38%)

Lidofilcon (70%)

Etafilcon (43%)

Bufilcon A (55%)

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