Method for making photochromic contact lenses

A polymerizable composition for actinically cast-molding photochromic silicone hydrogel contact lenses, wherein the polymerizable composition is a fluid composition which comprises:

• (a) from about 20% to about 40% by weight of at least one hydrophilic (meth)acrylamido monomer,
• (b) from about 15% to about 30% by weight of at least one siloxane-containing (meth)acrylamido monomer,
• (c) from about 15% to about 35% by weight of at least one polysiloxane vinylic crosslinker,
• (d) from about 0.005% to about 1.0% by weight of at least one photochromic compound,
• (e) from about 0.3% to about 1.5% by weight of at least one UV-absorbing vinylic monomer, and
• (f) from about 0.05% to about 1.5% by weight of at least one an acyl germanium photoinitiator relative to the total weight of the polymerizable composition, wherein the acyl germanium photoinitiator is capable of initiating a free-radical polymerization under irradiation with a light source including a light in the region of about 420 to about 500 nm,
• wherein the sum of the amounts of components (a) to (f) is at least 96% by weight relative to total amount of all polymerizable components in the polymerizable composition, wherein the polymerizable composition has a curing time of less than about 30 seconds as determined in photo-rheology study using a LED light source which provide a visible light with a spectral centroid of about 452 nm and a total irradiance of about 54 mW/cm2.