Patent ID: 8070475

Claim:
A casting mold for retaining a volume of curable liquid to form a biomedical device, the casting mold comprising: (a) a first mold section having a first optical surface and a radially extending first flange; (b) a second mold section having a second optical surface and a radially extending second flange, the first mold section and the second mold section sized to be engaged to define a mold cavity having a sealed edge; (c) one of the first and the second flange including a plurality of radially extending ribs; (d) a remaining one of the first and the second flange including an axially extending shoulder sized to engage the plurality of ribs at a corresponding plurality of contact points; and (e) a lever arm extending from the sealed edge to perpendicularly intersect a normal to a given contact point, a ratio of a diameter of the mold cavity to a length of the lever arm being greater than 6.