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)
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. buying glasses online measurement
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. If you don't have old frames to reference,
: Many online retailers (like Warby Parker or Zenni Optical) offer digital tools where you hold a standard magnetic stripe card (like a library card) against your forehead to help their software scale the measurement. Average Range : Most adults have a PD between 54mm and 74mm . 2. Decode Your Current Frame Measurements OS (Oculus Sinister) : Refers to your Left Eye
: The length of the "arms" from the hinge to the tip. 3. Determine Your Face Fit