Manufacture of contact lenses

There are different manufacturing systems according to contact lens materials.

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For soft contact lenses:

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Lathing: consists of placing a disc of the contact lens material, in a non-hydrated state, on a axis that is rotated. Then, cutting tools, controlled by computer, cut the anterior and posterior surface. Then, the finished lenses are removed to pass to a process of hydration and subsequent quality control.

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Modeling by injection: the material of soft contact lenses is heated to a melted state and then injected into a mold. Then it is cooled quickly, then removed from the molds, hydrated and finally, the quality control is performed.

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The manufacture by injection molding has allowed the market to use the lenses of use and throw, because the costs of manufacturing are lower.

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For semi-rigid contact lenses:

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Lathing: the manufacture must be very accurate because these lenses are rigid and any wrong parameter can make a failed adaptation.

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