You must have an up-to-date prescription from an eye doctor.
PD is the distance in millimeters between the centers of your pupils, which is vital for centering the lenses correctly.
: Use the Zenni Virtual PD Tool which uses your webcam and a standard magnetic card (like a credit card) for scale.
You must have an up-to-date prescription from an eye doctor.
PD is the distance in millimeters between the centers of your pupils, which is vital for centering the lenses correctly.
: Use the Zenni Virtual PD Tool which uses your webcam and a standard magnetic card (like a credit card) for scale.