American Optical History  -
AO Scientific Instruments History

AO Trial Lens Sets

1900 - AO introduced the first Trial Lens sets

AO produced a trial lens set design by Charles Prentice. This set was composed of biconcave minus lenses of true curve out the convex plus lenses were designed to neutralize the minus lenses. This meant that the lenses were almost exactly true vertex refractions or effective power. The first lenses so made. This principle is still used in our trial lens sets. Only the rings & cases have been updated.

Optical Heritage Museum collection-
AO Gift to Charles Prentice (1920) but still his basic design

From AO's 1912 Book on history/products

AO 1935 Catalogue - Right image shows model 593X which sold for $187.50

Feb 2010 photo of Optical Heritage Museum collection of AO Trial set from the early 1900s
(restored by Donna Silverberg- Assitant Curator)

Learn about:
The AO Lensometer
Note "Lensometer" was an AO Trademark name

More about AO Scientific Instruments achievments/timeline

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