Hi is there anyone who can help me out on the following questions:
Why is it desirable to use the smallest available blank size? Are there any circumstances when it wouldn't be that important.
How do you take account of the geometrical inset of the lenses when using a Lens Blank Pre-determinator or the Ditest?
How is the procedure/results different when using say a Glass solid 38mm downcurve bifocal compared to that of a CR39
What extra infromation needs to be specifies, when just ordering one new lens for the patient to match an existing bifocal?
Thanx:)
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