Author
Michelle Jones
ITFIT Optical Laboratory
· Lenses
Lensometer guide for opticians: reading free-form lenses
Where to read distance power, prism and add on a free-form progressive, what the engravings locate, and why a compensated lens won't match the written Rx.
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· Ordering
Optical lab turnaround: how many days by job type
Single vision leaves ITFIT in 1-2 business days and progressives in 2-3. How business days, shipping and missing details add up to the date you promise.
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· Lenses
Abbe value of lens materials: which one to order
CR-39, polycarbonate and 1.67 high-index compared by Abbe value and specific gravity, what each number means for the patient, and when to order each.
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· Coatings
Anti-reflective coating lenses: ordering AR from a lab
What AR does to the light, why it needs a hard coat under it, how to tell coating failure from a scratch, and what to write on the order.
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