Specifically for driving. These are always slightly tinted and change from green/yellow to reddish-brown based on light intensity. 2. Get Your Measurements Ready

Not all "photochromic" (light-adaptive) lenses are the same. is the brand name for the industry-standard technology. Transitions Gen-S Single Vision Lenses $134.96(£100.00) Tailored Optical Go to product viewer dialog for this item.

Stand 8 inches from a mirror. Hold a millimeter ruler against your brow. Line up "0" with your left pupil and read the measurement at your right pupil.

Transitions DriveWear - Polarized Photochromic - Polycarbonate Lenses (pair) Go-Optic.com Go to product viewer dialog for this item.

The latest standard. It darkens in seconds and clears faster than previous versions. Best for general daily use. Digital Ultra Progressives $435.00$885 Zoomer Intelligence Corp& more Go to product viewer dialog for this item.

This is the distance (in mm) between your pupils. If it's not on your prescription, you can measure it yourself:

Ensure your prescription is current (usually within 1–2 years). You can upload a photo of it or enter the numbers manually on most sites.

Buying lenses online can save you significantly compared to brick-and-mortar optical shops. This guide covers how to select the right lens tech, measure your own Pupillary Distance (PD) , and choose a reliable retailer. 1. Choose Your Lens Technology