In the background, display a soft gradient or subtle icons representing lens categories 0 to 4 (from very light to very dark circles).
Eye Protection

What Does "Cat 3" Mean? Sunglasses Lens Categories & VLT Explained

How Dark Should Your Sunglasses Be? The Science of VLT and Lens Categories You just bought a new pair of high-end sunglasses. You look at the tiny text printed on the inner temple arm, expecting to...