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    Question

    Can CPAP make my eyes worse for scleral lenses?

    Your lenses are out while you sleep, but what happens to your eyes overnight still shapes how your lenses feel in the morning. Here's what's known about sleep apnea, CPAP masks and dry eyes.

    By the Scleral Lens Team · Last reviewed October 2, 2026 · 5 published sources cited

    The short answer

    It can, if air leaks from the mask toward your eyes. A small study found that more mask leak was linked to lower tear production, and sleep apnea itself is linked to drier eyes and to loose, floppy eyelids. Don't stop CPAP because of your eyes: ask your sleep provider to check the mask fit and leak, tell your eye doctor you use CPAP, and remember your lenses must always be out before you sleep, including naps with the mask on.

    Key points

    • Your lenses come out before any sleep, CPAP or not.
    • Air leaking from the mask toward the eyes may dry them overnight.
    • Sleep apnea is linked to dry eye and to floppy eyelid syndrome.
    • A better mask fit is a sleep-team fix, not a reason to stop CPAP.
    • Tell your eye doctor and fitter you use CPAP.

    First: lenses out before you sleep

    CPAP is used while you sleep, and scleral lenses are never worn while you sleep. The FDA advises against sleeping in daily wear lenses because it may increase your chance of infection or irritation.[4] That includes naps with your CPAP mask on. See can you sleep in scleral lenses?

    So the question isn’t really about wearing lenses with CPAP. It’s about how a night on CPAP affects the eyes you put your lenses into in the morning.

    How CPAP and sleep apnea can affect your eyes

    Mask leak. If a CPAP mask doesn’t seal well, air can blow toward the eyes through the night. In a small study of 57 adults with sleep apnea, more mask leak was linked to lower tear production on testing.[2] The authors concluded that poorly fitted therapy, such as mask leak, may worsen evaporative dry eye, while noting that their study was small and retrospective.[2]

    Sleep apnea itself. A review that pooled 11 studies found people with obstructive sleep apnea had worse dry eye measures than people without it.[1] For CPAP, the evidence was thinner: only three studies, describing 180 patients, were available, and they suggested that people who had used CPAP for at least a year saw more improvement in dry eye than those who had used it for less than six months.[1] In other words, CPAP itself isn’t the enemy; a good, well-fitting CPAP setup may be part of the solution.

    Floppy eyelids. Floppy eyelid syndrome is a condition of unusually loose, elastic upper eyelids. An umbrella review of seven systematic reviews found that the studies consistently reported a link between floppy eyelid syndrome and obstructive sleep apnea, though the certainty of the evidence was low to moderate.[3] If you have sleep apnea, it’s worth asking your eye doctor to check your lids, since they matter for how a scleral lens feels.

    What you can do

    • Get the mask checked. Ask your sleep provider or equipment supplier to look at your mask fit and leak data. A different size or style may seal better.
    • Don’t stop CPAP for your eyes. Treating sleep apnea matters for your health. Work with your sleep team on the mask instead.
    • Tell your eye doctor and fitter. Mention that you use CPAP, especially if your eyes feel worst first thing in the morning, or if you’re getting mucus or film on your lenses.
    • Ask about overnight eye protection. Some wearers with dry eyes use moisture-chamber sleep masks, or gel or ointment at night. Ask your eye doctor what suits you, and ask how to clear ointment before inserting lenses. See night ointment and scleral lenses.
    • Give your morning eyes a moment. Some wearers find rinsing the eyes with preservative-free saline or using a lubricating drop before insertion makes the first lens of the day more comfortable. Ask your fitter.

    What wearers say

    • Some suspect their CPAP. Wearers have asked whether CPAP dries their eyes, and at least one who developed dry eye after starting CPAP believes the machine contributed.
    • Treating apnea helped others. At least one wearer found persistent mucus on their lenses came from floppy eyelids linked to sleep apnea, and cleared after starting CPAP.
    • Night protection helped some. Some wearers with dry eyes who use CPAP found that sealing in moisture overnight made their mornings easier.

    What to ask your sleep provider

    • Is my mask leaking, and could the air be reaching my eyes?
    • Would a different mask size or style seal better?
    • Is it safe to use a moisture-chamber sleep mask with my CPAP?

    What to ask your eye doctor or fitter

    • Do my eyelids show signs of floppy eyelid syndrome?
    • Could my CPAP be part of why my eyes feel dry in the morning?
    • What should I put in my eyes at night, and how do I clear it before inserting my lenses?

    Common questions

    Can I nap with my CPAP and my scleral lenses in?

    No. Lenses come out before any sleep, including naps. The FDA advises against sleeping in daily wear lenses because it may increase your chance of infection or irritation. If you use CPAP for naps, take your lenses out first.

    Would a different mask help my eyes?

    Possibly. That's a question for your sleep provider or equipment supplier, who can check the fit, the leak readings from your machine, and whether another mask style or size suits your face better.

    Do moisture goggles or sleep masks help?

    Some wearers with dry eyes use moisture-chamber sleep masks or goggles at night and find their eyes feel better in the morning. Check with your sleep provider that anything over your eyes doesn't interfere with the CPAP mask seal, and ask your eye doctor what suits your eyes.

    Could sleep apnea explain the mucus on my lenses?

    It's worth asking. Sleep apnea is linked to floppy eyelid syndrome, a condition of loose, rubbery upper lids. At least one wearer traced persistent mucus on their lenses to floppy eyelids, and found it cleared once their sleep apnea was treated. Your eye doctor can check your lids.

    Keep reading

    Can you sleep in scleral lenses?

    No. Take your scleral lenses out before any sleep, including a short nap. Across contact lens wearers, sleeping in lenses raises the risk of eye infection six- to eightfold, and closing your eyes over a scleral lens cuts the oxygen reaching your cornea further. The only exception is supervised medical treatment that a doctor prescribes for a specific eye condition.

    Do I need moisture chamber glasses with scleral lenses?

    Most wearers don't need them every day. A scleral lens already keeps your cornea under fluid. Moisture chamber glasses, which seal around the eyes to hold in humidity and block moving air, add the most in wind, dry offices, planes and very dry climates, and for people whose lens surface or eye corners dry out fast. At night the lenses come out, and some people with severe dry eye use moisture goggles or masks then. Never sleep in your lenses, goggles or not.

    Why is there mucus in my scleral lens, and how do I stop it?

    Some mucus is normal: your eye makes it all the time, and a scleral lens can collect it. Mucus already in the eye when the lens goes in is a common source, so rinsing and clearing the eye before insertion helps many wearers. Mucus that keeps building up during the day usually points to allergy, dry eye, lid disease, or a lens edge that lets debris under. Yellow or green discharge, or mucus with pain, redness, or blur, is not routine: remove the lens and call today.

    How do I use night ointment without clouding my scleral lenses the next day?

    Clear it off before the lens goes in. Wearers who use night ointment typically clean their lids and lashes in the morning, often with a warm compress or a warm shower, rinse the eye with sterile preservative-free saline, and give it a little time before insertion. Some use less ointment, apply it only along the lower lid, or switch to a night gel, which many find easier to clear. Ointment never goes on while your lenses are in, and prescription ointments need your prescriber's timing.

    Can your eyes be too dry for scleral lenses?

    Rarely in the sense of being ruled out: people who make almost no tears, and people with heavy oil-gland loss, wear scleral lenses every day. But very dry eyes make the lenses harder work. The front of the lens can dry and smear, fogging is common, and the lids and the white of the eye outside the lens can still feel dry. Many need extra treatment alongside the lens, and some don't get on with lenses at all.

    Sources

    1. Lin CW, Su YC, Liu JD, et al. Impact of obstructive sleep apnea and continuous positive airway pressure treatment on dry eye disease: a systematic review and meta-analysis. Nat Sci Sleep. 2024;16:1921-1935. doi:10.2147/NSS.S495883 pubmed.ncbi.nlm.nih.gov
    2. Wang WX, Chuang YN, Chang CN, Yang MC, Shen EP. Impact of positive airway pressure and mask leakage on dry eye and glaucoma risk in obstructive sleep apnea: a cross-sectional analysis. Biomedicines. 2025;13(12):3077. doi:10.3390/biomedicines13123077 pubmed.ncbi.nlm.nih.gov
    3. Napoli GTO, Lobato DM, Albertini FR, Machado Júnior AJ. Relationship between floppy eyelid syndrome and obstructive sleep apnea syndrome: an umbrella review. J Ophthalmol. 2026;2026:6084912. doi:10.1155/joph/6084912 pubmed.ncbi.nlm.nih.gov
    4. U.S. Food and Drug Administration. Everyday Eye Care (contact lenses). Content current as of December 4, 2023. fda.gov
    5. U.S. Food and Drug Administration. Contact Lens Risks. Content current as of September 4, 2018. fda.gov

    Last updated October 2, 2026. Found an error or a newer study? Let us know and we'll correct the page.