Boxing System

In 1962 the Optical Manufacturers Association adopted the boxing system to provide a standard for frame and lens measurement that greatly improved upon the accuracy of previous systems. The boxing system is based upon the idea of drawing an imaginary box around a lens...

Transposing Prescriptions

Depending on the equipment used by the doctor, a prescription may be in plus or minus cylinder form. For surfacing, the lab uses the minus form, meaning if a prescription is written in a plus cylinder form it must be transposed before processing. Transpose a...

The Dangers of Night Driving Glasses

It is an all too common misconception that yellow tinted or yellow polarized night driving glasses are beneficial for night time driving. The thought is, the yellow or amber color reduces glare and improves contrast. However, in reality, when driving at night or dusk...

Harry A. Saake’s 44 Tips for Dispensing Opticians

1. If you have a high plus lens, stay away from long narrow frames as they will tend to pop out of those frames the easiest since they are long across the top. One must understand that one of the reasons for having trouble keeping lenses in a metal frame is the...
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