Allentown Optical Corp.

Varilux and Crizal Promotion 

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In 1621, a Dutch physicist named Willebrord Snell (1591-1626), derived the relationship between the different angles of light as it passes from one transperent medium to another. When light passes from one transparent medium to another, it bends according to Snell’s law which states: that the angle of refraction is related to the

Continue reading Refraction Index of Various Substances

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Transposing a Rx prescription is simply converting the prescription from minus cylinder notation to plus cylinder notation. The optical properties of the prescription remain the same.

Procedure: 1) Add the cylinder power to the sphere power to arrive at the new sphere power.

2) Change the sign of the cylinder power.

3) Add or subtract

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Progressive lenses are by far one of the most complex lenses on the market. This often leaves the patient begging to know what the difference is between brands and designs. What all progressive lenses have in common is a distance section towards the top of the lens, a reading section towards the bottom nasal area

Continue reading Progressive Jargon

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