If you don't have old frames to reference, use these general guidelines based on your "total width" (Lens Width x 2 + Bridge Width): : Total width under 129mm. Medium : Total width between 130mm and 139mm. Large/Wide : Total width over 140mm. 4. Check Your Prescription (Rx)
The PD is the distance between the centers of your pupils in millimeters. This measurement is critical because it tells the lab where to place the optical center on each lens. If it’s off, you may experience eye strain or blurred vision. buying glasses online measurement
: Only filled out if you have an astigmatism. Tips for a Better Online Buy If you don't have old frames to reference,
If you already have a pair of glasses that fits well, the easiest way to shop is to match those dimensions. Look at the inside of the temple arm (the part that goes over your ear). You will usually see three numbers separated by small squares or dashes (e.g., 52 □ 18 — 140 ). If it’s off, you may experience eye strain
: The distance between the two lenses. This is the most important number for comfort, as it dictates how the glasses sit on your nose.
: The horizontal diameter of one lens. This determines how the "eyes" of the glasses look on your face.
Ensure your prescription is current (usually within the last 1–2 years). When entering it online: : Refers to your Right Eye . OS (Oculus Sinister) : Refers to your Left Eye . Sphere (SPH) : Indicates the strength of the lens.