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Pupillary Distance

This simple measurement can make the difference between crystal-clear vision and discomfort.

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What is Pupillary Distance?

Pupillary distance (PD) is the distance between the centers of your pupils, measured in millimeters. It reflects the alignment of your eyes and is a critical factor in ensuring your lenses are positioned correctly in your glasses frames. The PD measurement ensures that the optical center of each lens aligns precisely with your pupils, allowing you to see clearly and comfortably.

Why is PD Important for Glasses?

Visual Clarity

Incorrect PD can lead to blurred vision, double vision, or eye strain, as the lenses won’t be properly aligned with your eyes.

Comfort

Properly aligned lenses reduce strain on your eyes, making it easier to wear your glasses for long periods.

Multifocal Accuracy

For bifocals or progressives, accurate PD is even more critical, as the lenses require precise alignment for different focal zones.

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How to Measure Your PD

Measuring your PD on your own is tricky and prone to error. If your PD is not written on your prescription, we recommend using our KeraLink SmartFit - a quick, effortless, and highly accurate way to measure your PD. Simply scan your face using your device, and in just one minute, you’ll get a precise PD measurement, ensuring your lenses are perfectly aligned for clear, comfortable vision.

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