Lens Guide - How to Measure PD, Pupillary Distance, Progressive vs Bifocal, Blue Light Glasses Explained
Plain-English lens guide for single-vision, progressive, blue light, transitions, and high-index upgrades.
Correction type
One correction, one focal distance
The standard option for most people under 40 or anyone correcting only near- or far-sightedness.
Multiple corrections, no visible line
Blends distance, mid-range, and reading correction into one lens with a smooth transition.
Two corrections, visible line
A distinct near-vision segment at the bottom of the lens with a visible line separating it from distance correction.
Magnification only, no distance correction
For close-up tasks only — reading, screens. Not meant to be worn while walking or driving.
Lens features
Filters screen glare, not a prescription change
Reduces blue wavelength light from screens. Worth adding if you're on a screen most of the day.
Darkens in sunlight, clears indoors
One lens doubles as sunglasses outdoors and clears back up inside.
Cuts glare off flat, reflective surfaces
Mainly relevant for sunglasses and driving lenses — reduces glare off roads, water, and snow.
Thinner, lighter lens for strong prescriptions
A standard lens gets noticeably thick at higher prescriptions. High-index keeps it slimmer.
Pick your frame, then match the lens
Once you know which lens type you need, head back to the eyeglasses or sunglasses guide to pick a frame that suits it.