Patients ask me all the time what they can do for their eyes, especially what they can do to minimize eye pain.
It's a genuinely good question, and it's almost never asked about eyes alone. What people are really asking is whether there's something they're missing. I think people have an intuition that their eyes -- and pain they might feel in their eyes -- could be connected to their overall health and wellness, and that there may be some important aspects to this part of their health that they aren't optimizing.
So when people ask me this question, I ask a question back to better assess the advice that I could give them, and it is rarely a question they expect.
One of the first questions I ask when responding to this request is: "Do you rub your eyes a lot?" This catches people off guard. One patient that I asked this question to looked surprised, but then nodded his head. I followed up with if he snores while he sleeps and he said that he has been told that. And then that led to a discussion about potential sleep apnea and I recommended a sleep study.
He was not expecting to talk about his sleep or getting a sleep study when he saw me as a retina surgeon. But at a follow-up visit, he related to me that he got the sleep study done and had been diagnosed with sleep apnea. Since he began using his CPAP, his energy levels were much better, he was rubbing his eyes a lot less, and his eyes were more comfortable.
The short version
Sleep affects your eyes as well as the rest of you. Aim for seven or more hours, and keep your timing consistent, since regularity may matter even more than duration. If you snore, wake up unrefreshed, or your eyes feel worst first thing in the morning, ask your doctor about a sleep study.
When I look at the back of your eye, I'm not only looking at your eye
The retina is the one place in the body where a doctor can look directly at blood vessels and nerve tissue without making a single incision. Nowhere else comes close.
That means the back of your eye carries information about the rest of you. Blood pressure. Vascular health. Sometimes things you don't know about yet.
How much information? In 2018, researchers at Google trained a deep learning model on retinal photographs alone. From those images it could estimate a person's age, sex, smoking status, and blood pressure, and it could flag risk of a major cardiac event.
Worth being precise here, because this gets overstated constantly. The cardiac prediction was moderately accurate. It is a signal, not a diagnostic test, and nobody is screening hearts with retina photos in clinic today. But it tells you something real about how much your retina reflects your body.
Sleep duration and consistency
Here's the part that surprises people.
I am a natural night owl. I have tried, on and off for years, to become a morning person. I have made peace with the fact that I prefer going to bed late and waking up late.
So when I talk to patients about sleep, I'm not lecturing from the high ground. I'm telling you the thing I have to work at myself.
Two findings changed how I think about it.
Adults need seven or more hours on a regular basis. That's the joint recommendation from the American Academy of Sleep Medicine and the Sleep Research Society.
Consistency may matter more than duration. A 2024 analysis of about 61,000 people in the UK Biobank, all wearing activity trackers, found that the most regular sleepers had roughly 20 to 48 percent lower risk of death than the least regular. And sleep regularity predicted mortality more strongly than how long people slept. A separate UK Biobank analysis put the most irregular sleepers at about 53 percent higher mortality risk than average.
Read that again, because it inverts the usual advice. Five hours on weeknights and a twelve-hour crash on Saturday is not the same as seven hours every night. The crash doesn't buy back what the pattern costs.
The eye symptom that points somewhere else
Now the part that belongs specifically to me.
There's a condition called floppy eyelid syndrome. The upper eyelids become lax enough to flip easily, often during sleep, and the eye surface gets chronically irritated. Patients describe it as dry eye. It's usually worse first thing in the morning.
It is strongly associated with obstructive sleep apnea. In pooled data, it shows up in a large share of patients with sleep apnea, with some estimates around 40 percent.
Earlier this year the New England Journal of Medicine published a case that reads like a dozen visits I've had: a patient whose dry eye was worse every morning, whose eye exam prompted a sleep study, and who turned out to have moderate sleep apnea.
That's why I ask about sleep and snoring in an eye clinic. And when I ask, very few of those patients have ever been tested.
The honest version of the eye and sleep apnea connection
This is where a lot of health content oversells, so let me grade it plainly. Among eye conditions studied alongside sleep apnea:
Strongest link:
NAION, a form of sudden painless vision loss often noticed on waking. Roughly 3.6 to 4 times the odds.
Moderate:
floppy eyelid syndrome, retinal vein occlusion, central serous chorioretinopathy, keratoconus.
Weak and inconsistent:
glaucoma.
No clear link:
age-related macular degeneration.
And one caveat that matters. A 2022 review in the Journal of Clinical Sleep Medicine describes the overall evidence connecting sleep apnea to eye disease as weak and contradictory, and the evidence that treating apnea reverses eye damage is low quality.
So: these are reasons to get evaluated, but it is very difficult to prove causation. My assessment is that the evidence between overall health and sleep apnea is strong, as well as the connection to eye health and visual function to one's overall health. If treating your sleep apnea is good for your overall health, and it could potentially improve some of your current eye symptoms or prevent permanent vision loss in the future, then why not do it?
How common is this, really?
Global estimates of obstructive sleep apnea range widely, roughly 9 to 38 percent of adults depending on the population and definition used.
The number that should get your attention is different. More than 80 percent of moderate to severe cases are undiagnosed. One estimate puts undiagnosed US adults at around 24 million.
If you snore, wake up unrefreshed most days, or someone has told you that you stop breathing at night, that is worth a conversation with your doctor about a sleep study.
Five things you can try this week
Start with just one! These are the things that are easy to say and hard to do, and doing one of them consistently beats doing all five for four days.
1. Set a caffeine cutoff. A 2023 meta-analysis found caffeine reduced total sleep time by roughly 45 minutes on average, and suggested finishing coffee something like nine hours before bed. If you go to bed at 11pm, that means your last coffee around 2pm. Earlier research found that caffeine taken even six hours before bed still disrupted sleep measurably.
2. Anchor your wake time. Same time every day, weekends included. This is the single biggest lever for regularity, and regularity is the thing the mortality data keeps pointing at.
3. Get outdoor light early. Ten or fifteen minutes within a half hour of waking helps set your circadian clock. Coffee on the back porch. A walk with the dog. It doesn't need to be a routine, it just needs to happen outside.
4. Move alcohol away from bedtime. It helps you fall asleep and then fragments the back half of the night.
5. Exercise during the day. It makes falling asleep easier and staying asleep more likely.
The free scorecard
Sleep is one of the everyday habits in my free Eye Optimization Scorecard, a guide to the foundations that help protect your eyes, with a few simple ideas to try for each one.
It's a work in progress, and I update it as the evidence changes.
Get the free Eye Optimization Scorecard
Quick answers to common questions
Does sleep affect your eye health?
Yes. Short or irregular sleep is tied to worse overall health, and sleep apnea is linked to several eye conditions.
Can sleep apnea cause dry, irritated eyes?
It can contribute. Floppy eyelid syndrome, strongly associated with sleep apnea, irritates the eye surface and feels like dry eye that is worse in the morning. For everyday gritty, burning eyes, see how to do warm compresses right.
Which eye conditions are linked to sleep apnea?
Strongest: NAION. Moderate: floppy eyelid syndrome, retinal vein occlusion, central serous chorioretinopathy, keratoconus. Weak: glaucoma. No clear link: macular degeneration.
When should I stop caffeine before bed?
Roughly nine hours before bed; for an 11pm bedtime, about 2pm.
Is being a night owl bad for my health?
Not by itself. The problem is a night owl on a morning schedule; keep your timing consistent, starting with your wake time.
References
Retinal imaging and systemic health
Poplin R, Varadarajan AV, Blumer K, et al. Prediction of cardiovascular risk factors from retinal fundus photographs via deep learning. Nature Biomedical Engineering. 2018;2(3):158-164.
Sleep duration and regularity
2. Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep. 2015;38(6):843-844.
3. Windred DP, Burns AC, Lane JM, et al. Sleep regularity is a stronger predictor of mortality risk than sleep duration: a prospective cohort study. Sleep. 2024;47(1):zsad253. doi:10.1093/sleep/zsad253
4. Cribb L, Sha R, Yiallourou S, et al. Sleep regularity and mortality: a prospective analysis in the UK Biobank. eLife. 2023;12:RP88359. doi:10.7554/eLife.88359
Caffeine and sleep
5. Gardiner C, Weakley J, Burke LM, et al. The effect of caffeine on subsequent sleep: a systematic review and meta-analysis. Sleep Medicine Reviews. 2023;69:101764. doi:10.1016/j.smrv.2023.101764
6. Drake C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine. 2013;9(11):1195-1200. doi:10.5664/jcsm.3170
Sleep apnea prevalence and diagnosis
7. Redline S, Azarbarzin A, Peker Y. Obstructive sleep apnoea heterogeneity and cardiovascular disease. Nature Reviews Cardiology. 2023;20(8):560-573. doi:10.1038/s41569-023-00846-6
8. Veasey SC, Rosen IM. Obstructive sleep apnea in adults. New England Journal of Medicine. 2019;380(15):1442-1449. doi:10.1056/NEJMcp1816152
9. Benjafield AV, Ayas NT, Eastwood PR, et al. Estimation of the global prevalence and burden of obstructive sleep apnoea: a literature-based analysis. Lancet Respiratory Medicine. 2019;7(8):687-698.
10. de Araujo Dantas AB, Gonçalves FM, Martins AA, et al. Worldwide prevalence and associated risk factors of obstructive sleep apnea: a meta-analysis and meta-regression. Sleep and Breathing. 2023;27(6):2083-2109. doi:10.1007/s11325-023-02810-7
Sleep apnea and the eye
11. Bulloch G, Seth I, Zhu Z, Sukumar S, McNab A. Ocular manifestations of obstructive sleep apnea: a systematic review and meta-analysis. Graefe's Archive for Clinical and Experimental Ophthalmology. 2024;262(1):19-32. doi:10.1007/s00417-023-06103-3
12. Shinder KE, Shinder R. Floppy eyelid syndrome. New England Journal of Medicine. 2026;394(6):e10. doi:10.1056/NEJMicm2512228
13. Salinas R, Puig M, Fry CL, Johnson DA, Kheirkhah A. Floppy eyelid syndrome: a comprehensive review. The Ocular Surface. 2020;18(1):31-39. doi:10.1016/j.jtos.2019.10.002
14. García-Sánchez A, Villalaín I, Asencio M, García J, García-Rio F. Sleep apnea and eye diseases: evidence of association and potential pathogenic mechanisms. Journal of Clinical Sleep Medicine. 2022;18(1):265-278. doi:10.5664/jcsm.9552
15. Sun J, He J, Liang Z. Comparison of ocular surface assessment outcomes between healthy controls and patients with obstructive sleep apnea-hypopnea syndrome: a meta-analysis. Frontiers in Physiology. 2023;14:1163947. doi:10.3389/fphys.2023.1163947
16. Mentek M, Aptel F, Godin-Ribuot D, et al. Diseases of the retina and the optic nerve associated with obstructive sleep apnea. Sleep Medicine Reviews. 2018;38:113-130. doi:10.1016/j.smrv.2017.05.003
This article is for general educational purposes only and is not medical advice. Reading it does not create a doctor-patient relationship. Always consult your own physician about your specific situation. If you experience sudden vision loss, flashes, a curtain over your vision, or eye pain, seek care immediately.
Views expressed are my own and do not represent any institution or practice I am affiliated with.
Disclosure: I am the founder of Aetopia Health, which offers the free Eye Optimization Scorecard and the Visionspan™ Foundations guide.