| yazhuge |
2005-11-14 19:12 |
Lens having at least one lens centration mark and methods of making and using same
Claims Z 8GIZ
1. A method of measuring centration of a lens, the method comprising: 'kg~#cf/+
placing the lens on a platen, wherein the lens comprises a first major surface and a second major surface, wherein the first major surface is rotationally symmetrical about a first axis, and further wherein the first major surface comprises a first lens centration mark located at the intersection of the first major surface and the first axis, wherein placing the lens on the platen comprises placing the lens on the platen such that the first lens centration mark is aligned with a rotation axis of the platen; WM=)K1p0 u
leveling the lens relative to a plane of rotation that is orthogonal to the rotation axis of the platen; $d&7q 5[
rotating the lens about the rotation axis of the platen; and aghlYcPg
observing the lens during or alter rotation to assess centration of the first major surface of the lens. ]2|KG3 t
2. The method of claim 1, wherein assessing centration of the first major surface of the lens comprises: xr!A>q+@i
measuring a maximum distance from a reference point to an outer edge of the lens as the lens rotates; D
| |