Why Do Glasses Cause Headaches?

Six common reasons, how to tell them apart, and what you can do about each.

Glasses are meant to make seeing easier, so it is frustrating when a new pair leaves you with an ache behind your eyes or a tight band across your forehead. The good news is that this is common, it is often temporary, and the cause can usually be tracked down.

Here is the short version. A headache after getting glasses usually comes from one of a few places: your eyes and brain are still getting used to the new lenses, the lens power or alignment is not quite right for you, the frame is pressing on your head or sitting in the wrong spot, or something about how you use your eyes during the day (long hours on a screen, for example) is adding strain. Sometimes the headache has nothing to do with your glasses at all.

Any change to the way light reaches your eyes takes your visual system a little time to get used to. That includes a new prescription, your first pair of glasses, a noticeably stronger prescription, a new correction for astigmatism, a different lens material or coating, and a different frame size or shape. Progressive lenses ask for the most adjustment, because you have to learn which part of the lens to use for each distance.

What it often feels like: mild tension, a slightly “heavy” feeling around the eyes, or a floor that looks a little different at first. These sensations are usually strongest in the first few days.

What helps:

●      Wear the new pair as consistently as you comfortably can. Switching back and forth with your old glasses keeps interrupting the adjustment.

●      Ease in if you need to. Wear them for shorter stretches at first and build up.

●      Take a short break from close work when your eyes feel tired.

Most people settle in within a week or two, and some, especially with progressive lenses, need up to about four weeks. One consumer eye-care resource describes adjustment as often taking only a few days and up to about two weeks for some people [3]. That source also advises contacting your eye care provider if headaches, strain, or distorted vision last more than two or three days, so don't wait if something feels clearly wrong. If you wear progressives, our wearing guide shows how to use each part of the lens.

Your eyes work harder when the correction doesn't match what they need. That can happen in a few ways:

●      An out-of-date prescription. Vision changes over time, and an old prescription may no longer fit. The American Academy of Ophthalmology lists uncorrected vision or an outdated prescription among the causes of eye strain [1], and the Mayo Clinic lists uncorrected refractive error among the underlying causes [2]. Squinting, blurry vision, and headaches after reading are common clues.

●      A small error in the numbers. A digit entered wrongly, a sign (plus or minus) swapped, or an axis mistyped can leave your glasses feeling off even though the lenses were made exactly as ordered.

●      An uncorrected or under-corrected problem. Even a small amount of astigmatism or farsightedness can make long stretches of reading or screen work tiring.

What helps: have an up-to-date eye exam, and compare the numbers on your order with the written prescription from your eye doctor. Aldermiller fabricates exactly what is submitted, and our reviewing optometrist checks it for completeness. We do not perform eye exams or prescribe, so if you think the prescription itself may be wrong, your own eye care provider is the right person to check it.

Lenses are made so the optical center sits in front of each pupil. If the measurements used to place them are off, your eyes may have to work to compensate. People describe this as eye fatigue, a pulling feeling, or discomfort behind the eyes.

Two measurements do most of the work. Pupillary distance (PD) is the horizontal distance between your pupils. Segment height (also called fitting height) is the vertical position of your pupils in the frame. It is needed for progressive and anti-fatigue lenses.

Because we make each pair as one finished order and do not ship frames out for trying on, these numbers come from you. If you suspect a measurement was off, it is worth checking. Our guide to measuring segment height at home walks you through it, and our Glasses Size Guide explains the frame numbers. Email us with your order number, and our reviewing optometrist can look at your prescription and lens parameters.

Some headaches come from physical pressure rather than from vision. Common signs:

●      Temples that feel squeezed or sore after a short time

●      Red marks on the sides of the nose or behind the ears

●      A bridge that pinches

●      Glasses that slide down, so you find yourself tensing your face or pushing them up all day

A frame that is too narrow, too heavy for your nose, or bent out of alignment can add up to a dull ache that spreads toward the temples or behind the ears. A slipping frame also changes where you look through the lens, which matters most with progressives.

What helps:

●      Pay attention to where the pressure is, and when it starts.

●      Don't bend the frame hard yourself. Modern frames can crack or lose their shape. A professional adjustment of the temples, nose pads, or fit often solves it in minutes.

●      Email hello@aldermiller.com and tell us where it presses. We'll give you guidance on frame adjustment.

For your next order, compare lens width and bridge width with a pair you already find comfortable. Matching them within about 1 to 2 mm usually feels very similar.

Hours of near focus can leave your eyes tired and your head achy even with well-fitted glasses. The American Optometric Association lists headaches among the most common symptoms of computer vision syndrome (digital eye strain) and says people who spend two or more continuous hours a day on a computer or digital device are at greatest risk [4]. Screens add glare, a lower blink rate (which dries the eyes), and a fixed viewing distance. Typical clues: the headache builds through the day and eases on weekends or after a break.

What helps:

●      Follow the 20-20-20 habit, which both the AOA and the AAO recommend: every 20 minutes, look at something about 20 feet away for 20 seconds [4][1].

●      Place the screen about an arm's length away, with the top at or slightly below eye level.

●      Cut glare with lighting you can control, and consider an anti-reflective coating.

●      Blink often, and increase the text size instead of leaning in.

●      If you are not yet presbyopic and your near work is heavy, ask about an anti-fatigue lens, which adds a small boost in the reading area.

A word on blue-light filters: some people like them, but the evidence for eye strain is weak. A 2023 Cochrane review found that blue-light filtering lenses may not reduce symptoms of eye strain from computer use over the short term, based on low-certainty evidence [5]. The American Academy of Ophthalmology does not recommend blue-light-blocking glasses for digital eye strain [6]. We offer them as a personal preference, not a cure. Habits and a correct prescription matter more.

Headaches have many causes, including tension, poor sleep, dehydration, skipped meals, bright light, sinus problems, and migraines. If your headaches began around the same time as the glasses, the timing can make them look related when they are not. A simple log helps: note when the headache starts, where it hurts, and what you were doing.

What you notice	Possible cause	What to try
Mild tension in the first days, easing over time	Adjusting to new lenses	Wear them consistently, take breaks
Blur, squinting, or headaches after short tasks	Prescription out of date or not a good match	Eye exam; check the numbers on your order
Pulling or fatigue behind the eyes, double vision	Lens alignment or measurements	Contact us; a review of PD and lens parameters
Sore temples, nose, or behind the ears	Frame pressure or poor fit	Frame adjustment guidance; compare sizes
Slipping glasses, tilted head, neck strain	Fit, or progressive measurements	Fit adjustment; see the segment height guide
Headache builds through a day of screen work	Digital eye strain	Breaks, screen setup, anti-reflective coating
Headaches with no link to wearing glasses	Another cause	Talk to your doctor

Get medical care promptly if you have A sudden, severe headache that is unlike your usual ones Sudden vision loss, double vision, or flashing lights Eye pain with redness, nausea, or seeing halos around lights A headache after a head injury, or with weakness, numbness, confusion, or trouble speaking These can be signs of something unrelated to glasses that needs urgent attention.

 

For everything else, a useful rule: if headaches are frequent, getting worse, or not easing after a few days of consistent wear, don't just live with it. See your eye care provider about your prescription, and contact us about lens measurements and frame fit. If you are wearing progressives and still struggling after about four weeks, please contact us.

To reach us, email hello@aldermiller.com with your order number, what you notice, and when it happens. Our reviewing optometrist can look at your prescription, the lens parameters, and your history. For what is covered, see our Return & Refund Policy and Prescription Policy.

●      New glasses can cause temporary headaches while your eyes adjust. One to two weeks is typical, and up to four for some people.

●      Check four things: the prescription, the lens measurements, the frame fit, and how long you spend on screens.

●      Don't bend frames hard at home. Ask for adjustment guidance.

●      Seek urgent care for a sudden severe headache or sudden vision changes.

●      If it doesn't improve, tell us. We want you comfortable in your glasses.

These sources are cited for general information. Their publishers have not reviewed or endorsed this article.

[1] American Academy of Ophthalmology. “Eye Strain and Sleepy Eyes: How to Prevent Eye Discomfort.” aao.org/eye-health/diseases/what-is-eye-strain (published May 5, 2023; reviewed by Laurie Gray Barber, MD).

[2] Mayo Clinic Staff. “Eyestrain.” mayoclinic.org/diseases-conditions/eyestrain/symptoms-causes/syc-20372397 (July 2, 2024).

[3] Woodard A. “How long does it take to adjust to new glasses?” All About Vision. allaboutvision.com/eyeglasses/adjustment-time/ (published March 5, 2020).

[4] American Optometric Association. “Computer vision syndrome.” aoa.org/healthy-eyes/eye-and-vision-conditions/computer-vision-syndrome (accessed October 31, 2026).

[5] Singh S, Keller PR, Busija L, et al. “Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults.” Cochrane Database of Systematic Reviews. 2023. doi:10.1002/14651858.CD013244.pub2.

[6] American Academy of Ophthalmology. “Are Blue Light-Blocking Glasses Worth It?” aao.org/eye-health/tips-prevention/are-computer-glasses-worth-it (published March 5, 2021; updated September 2023).