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Progressive Lens Formula

A Reliable Way to Order Progressive Lenses Online


hi index 170 Online Optical Store has developed a proprietary mathematical method for determining the optimal position of the reading, or seg height, portion of a progressive no-line bifocal lens.

Your prescription will sometimes contain the seg or bifocal height information for your frame. The seg measurement is usually taken by an optician while you’re in the office. If it’s not available, we will use our system to determine the optimal position for you.

The Progressive Setting Formula SM has been tested on thousands of progressive lenses and will determine the precise segment height for your glasses so you can feel comfortable about ordering progressive lenses online.

If you have any questions about ordering progressive lenses, please call our friendly operators at 1-888-409-6977.


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