: Optometrists often omit Pupillary Distance (PD) —the distance between your pupils in millimeters—from standard scripts. An incorrect PD can lead to visual distortion and eye strain. If it's missing, use an online measurement tool or app before ordering. 2. Find Your Digital Fit

To avoid high-priced "inspired by" fakes, stick to authorized dealers. How to Shop for Designer Glasses Online Dos and Don't

: Modern retailers use 3D virtual try-on tools that allow you to see how frames look on your face via your webcam.

Before you browse, you need a current prescription (issued within the last 1–2 years).

: Your prescription must include Sphere (SPH) , Cylinder (CYL) , and Axis values.

: Some reputable sites like Warby Parker will ship you several sample frames for free so you can test them in person before adding a prescription. 3. Spotting Authentic Designer Frames

: Look at the inside temple arm of your current, best-fitting glasses. You'll see three numbers (e.g., 52-18-140) representing lens width , bridge width , and temple length . Match these as closely as possible to new frames.