Smart glasses guides: the basics, fit, lenses and battery

Start here if you have never worn a pair

What are smart glasses answers the question in the first paragraph and then explains what each kind does; how they work covers the camera, the microphones, the open-ear speakers, the assistant and the phone connection without jargon; and are they worth it is the honest answer to the question people type into Reddit. Read those three and you know more than most people who own a pair.

Then solve the fit and the lenses

These are the guides that decide whether you will actually wear the glasses. The prescription guide lists every current model's published range in diopters and who to order from; the fit guide for big heads puts frame widths in millimeters side by side; Transitions lenses explains what photochromic lenses do and do not do in a car; and sunglasses vs clear settles the question most first-time buyers get wrong. Vision insurance covers whether a plan will pay for the lenses.

Then the battery

Battery life compared puts every model's rated hours next to the hours named reviewers measured, in one table. It is the page on this site most likely to change which pair you buy, because “up to 8 hours” and “about 5 hours with video” are different products for a different day.

What decides price, in plain terms

Not the camera. Across Meta's lineup the camera and AI are the same from the cheapest Meta-brand frame to the prescription-first Ray-Ban Optics. You pay for the brand name, for lens options, for fit hardware, for sport features, or for a display. The guides in this hub are written so that by the time you reach a roundup you already know which of those you are paying for and why.

The mistake beginners make

Choosing by video resolution. 3K versus 1080p is a real difference in daylight and no difference at night on any Meta pair — every reviewer we cite says low-light video is weak across the range. Fit, weight, lens tint and battery decide whether the glasses leave the case; choose those first, and let the camera break the tie. The AI vs AR guide is the other trap: “smart glasses” with a virtual screen for movies are a different product with a cable, and buying one expecting a camera and an assistant is a common return.