August 7, 2013

One area of Opticianry that seems to have more Opticians baffled is prism. I hope in this short tutorial it will ease the misunderstanding of...

January 29, 2013

The purpose of this article is to help those to understand how lenses work through the understanding of ray tracing. For the purpose of this...

May 13, 2012

The approximate power on the vertical meridian for the Rx +3.00 -1.50 x 102 is?

Vertical meridian is the power in the 90th meridian. First...

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