Holding mechanism for use with an ophthalmic tracer, and method

A method of tracing a lens mount of an eyeglass frame, comprising the steps of:

• securing the eyeglass frame proximate a tracer apparatus having an object engager;
• tracing at least a portion of a first lens mount with the object engager and thereby generating initial trace data;
• calculating a delta Z of the first lens mount based on the generated initial trace data;
• tilting the eyeglass frame about a vertical axis by a first prescribed angle if the delta Z value exceeds a predetermined threshold, wherein the first prescribed angle corresponds to the first delta Z value;
• and
• re-tracing the first lens mount using the tracer apparatus if the first delta Z value exceeded the predetermined threshold, thereby generating secondary trace data.