August 12, 2016


August 7, 2013

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

January 29, 2013

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

May 13, 2012

Test 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....