The short answer: Both. You can freely buy non-prescription (plano) glasses, fashion frames, and over-the-counter reading glasses with no prescription at all. But glasses made to correct your distance or astigmatism vision need a valid prescription from an eye exam, because the correction and measurements have to match your eyes. You can also buy a frame now and have your prescription lenses fitted to it later.
What you can buy without one
Plenty of eyewear needs no prescription. Sunglasses (with UV400), blue-light glasses, costume and fashion frames, and off-the-shelf reading glasses are all sold freely. Anything with no corrective distance power, or with a simple magnifying power printed on it, is available over the counter.
Plano and fashion glasses
Plano means "no corrective power": clear lenses in a real frame, worn for looks or for the frame style alone. These are sold without any prescription. If you love the frame but do need vision correction, you can usually have plano lenses swapped for your prescription lenses.
Reading glasses off the shelf
Drugstore readers are non-prescription magnifiers, labeled by strength such as +1.50 or +2.00, and both lenses share the same power. They work for many people for close work. Their limit is that they ignore astigmatism and your PD, so if your eyes differ or you have astigmatism, prescription readers are sharper. And no, they do not weaken your eyes; see do reading glasses weaken your eyes.
What needs a prescription, and why
Glasses that correct nearsightedness, farsightedness, or astigmatism need a valid prescription. The correction has to match each eye, and the lenses have to be centered to your pupillary distance, so the optical center sits over your pupil. Guessing these causes blur, strain, and headaches, which is why an eye exam comes first. Learn to read the result in how to read your prescription.
Getting frames now, lenses later
You do not have to choose the frame and the lenses at the same moment. Many people buy a frame they love, then have their current prescription lenses fitted into it, as long as the frame suits the lens type. If you are ordering a full pair online, you will need your prescription and PD ready; see how to buy glasses online.
From our test bench. The distinction we stress is centering. A plano or fashion frame has no optical center to line up, so any frame works. The moment there is a prescription in the lens, the PD and centering matter, and a frame that sits crooked or lenses ground off your PD cause the strain people blame on the prescription itself.
FAQ
Can I buy glasses without a prescription?
Yes for non-prescription (plano) glasses, fashion frames, blue-light glasses, and over-the-counter readers. Glasses that correct your vision require a valid prescription, because the correction and centering must match your eyes.
Do I need a prescription for blue light glasses?
No. Blue-light glasses without corrective power are sold freely. If you want blue-light filtering combined with vision correction, that lens does require a prescription.
Can I put my prescription lenses in any frame?
Usually, if the frame suits the lens type and your prescription. Many people buy a plano or fashion frame and have prescription lenses fitted to it later at an optician.
Part of How to Buy Glasses Online · Related: how to read your prescription · Browse sunglasses · Last updated: August 5, 2026
