Lenses that darken automatically when you step outside.
Ideal for those spending long hours in front of digital screens.
Most reputable online optical stores offer a or a one-time replacement guarantee. Because minor adjustments to the "wrap" or "tilt" of the frames might be needed, many local opticians will perform a final fitting for a small fee or even for free.
If you have a strong prescription, these prevent the "coke bottle" effect by keeping lenses thin and light.
The biggest challenge of online shopping is knowing how a frame will actually look on your face. Modern retailers solve this using two primary tools: