: Ensure it is not expired (most are valid for 1–2 years). If you need an exam, you can visit local centers like Costco Optical or Walmart Vision Center .
: Great if you spend 8+ hours a day looking at digital devices.
: This is the distance between your pupils in millimeters. If it's not on your Rx, you can measure it using apps like Zenni Optical’s PD Tool or Warby Parker’s tool .
You cannot rely on just your vision prescription; you need two specific data points that online stores often hide in the fine print.