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WHAT IS PUPILLARY DISTANCE AND WHY IS IT IMPORTANT Pupillary Distance (or PD) is one of the numbers that you will need to enter in your prescription while buying your glasses online. It measures the distance in millimeters (mm) between the centers of your pupils. It is important to have an accurate PD to ensure that you're looking through the correct spot in your lenses and have clear and the most accurate vision at all times. The average PD for adults is between 54mm to 74mm, whereas, the s...

Lens index describes the thickness of your optical lens - a higher lens index indicates a thinner lens. Lenses with a high index are thinner and more powerful. They're light and fashionable, but they're mostly recommended to those who require a higher vision correction. While multiple indexes can be used for most prescriptions, it is up to you to decide which one fits your personal needs. Recommended Lens Index Lens index Features SPH ...