Before you shop, you need a valid prescription from an optometrist. If you already have glasses but lost your paper prescription, GlassesUSA.com provides three ways to get it:
Choose from single-vision (reading or distance), progressives, or bifocals. classesusa.com
You can find your current measurements (usually on the inside of the temple arm) and enter them into the Frame Size Finder tool to ensure a comfortable fit. Before you shop, you need a valid prescription
A free, FDA-listed app that extracts your current optical details in about 10 minutes using your smartphone and a computer. Before you shop
You can simply upload a digital copy of your doctor's written form.
Once you've picked a frame, you'll select your lens type and functional coatings: