Contact Lens Mould And Methods
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United States of America Patent
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Dec 22, 2014
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Dec 23, 2013
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Abstract
A mould for the production of a contact lens, the mould comprising a first mould half shaped to provide the front surface of the contact lens; and a second mould half shaped to provide the rear surface of the contact lens, wherein the first and second mould halves form a mould cavity, wherein the first mould half has a first rim and the second mould half has a second rim, and the first and second rims fit together to provide a seal for the mould cavity, wherein the first rim is inclined at an angle of x relative to an axis passing through the centre of the first and second mould halves, wherein x is from 30 to 60°, and wherein the second rim is inclined at an angle of x-y relative to the axis passing through the centre of the first and second mould halves, where y is from 0 to 4°, and wherein the first and second rims provide a guide for the mould halves, a method of making a contact lens using the mould and a method of making a mould.
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