Principles of Atoric Lens Design

Industry studies have shown that approximately 70% of all spectacle wearers receive a cylinder correction for astigmatism. Further, 50% of these wearers have corrections with over 0.50 D of cylinder power. This article will show that conventional lens design does not...

Fundamentals of Progressive Lenses

A progressive addition lens (PAL) is a type of multifocal lens that employs a surface with a continuously smooth increase in addition (Plus) power. The curvature of the surface increases from its minimum value in the distance zone to its maximum value in the near zone...

Resultant Prism Chart

Download the printable resultant prism chart, handy for converting the two-component prescriber's method of specifying prism to a single component resultant method. Resultant Prism...
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