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ciba uses molds made of transparent quartz glass, which can be reused, unlike the plastic molds used for hydrogel lenses. a drop of nelfilcon a is placed onto one half of the mold, and the complementary half is suspended a few micrometers away. a circular mask is placed around the edge of the lens, and ultraviolet light is shined through the molds to cure the polymer. the mask blocks the uv light and creates a precise, smooth rim. this allows for a consistent shape with an edge half the thickness of other lenses. a thinner edge reduces what''s known as edge sensation, discomfort caused by the eyelid rubbing against the lens rim. a lens is about 14 millimeters in diameter, but only the center portion, 8 mm across, is shaped to correct vision.

ciba uses molds made of transparent quartz glass, which can be reused, unlike the plastic molds used for hydrogel lenses. a drop of nelfilcon a is placed onto one half of the mold, and the complementary half is suspended a few micrometers away. a circular mask is placed around the edge of the lens, and ultraviolet light is shined through the molds to cure the polymer. the mask blocks the uv light and creates a precise, smooth rim. this allows for a consistent shape with an edge half the thickness of other lenses. a thinner edge reduces what''s known as edge sensation, discomfort caused by the eyelid rubbing against the lens rim. a lens is about 14 millimeters in diameter, but only the center portion, 8 mm across, is shaped to correct vision.

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