Importance

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Abstract

A block for coupling an ophthalmic lens to at least two machine chucks is molded, preferably using adhesive material in a liquid or gel state, as a unitary member of diameter less than a diameter of the lens with concentric inner and outer portions separated by a narrow intermediate portion. The inner, outer and intermediate portions have a front face molded to conform to a face of the lens. The outer portion has a rear face molded to conform to a first chuck and the inner portion has a rear face molded to conform to a second chuck. The intermediate portion is thinner than the inner and outer portions so that the outer portion is separable from the unitary member and the lens by lifting the outer portion away from the lens and tearing the member along the intermediate portion. Preferably, the outer portion rear face has means such as a tab or a pair of diametrically aligned tabs on its outer edge for facilitating lifting of the outer portion from the lens. It is also preferred that the inner portion has a circular aperture through its center to facilitate inspection of the blocked lens. The block may be used in conjunction with an adapter having a front face complementary to the rear faces of the member and a rear face complementary to the first chuck with a diametric slot extending from the front face of the body to a depth proximate its rear face so that the gap is decreased when the body is squeezed so as to grip the diametric and radial fins.

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First Claim