By Refine Nutrition. Sources checked October 6, 2026.
Here is the short answer. Eyes that feel tired, dry, or hard to focus after a long stretch of screen time are common, and they often ease with breaks. But new floaters, flashes of light, or a shadow or curtain over part of your vision are not screen-strain symptoms. Those call for an eye care professional right away. Everything in between, including symptoms that keep coming back, is worth an exam.
This guide helps you sort what you are feeling into one of those groups. It is general education, not a diagnosis, and it cannot replace an exam.
What Digital Eye Strain Usually Looks Like
Digital eye strain, also called computer vision syndrome, is a group of eye and vision symptoms linked to screen use. A 2018 review in BMJ Open Ophthalmology says symptoms fall into two broad groups: those tied to the focusing and eye-teaming effort of near work, and those on the outside of the eye tied to dry eye. The same review estimates that 50% or more of computer users may be affected, and says symptoms are typically transient, though they can be frequent and persistent (Sheppard and Wolffsohn, PubMed).
A later international review (TFOS Lifestyle) notes that there is no single agreed definition or diagnostic test for digital eye strain, which is one reason reported rates vary so widely (Wolffsohn et al., Aston University repository). In plain terms: the label is a useful description, not a test result. Only an exam can tell you what is behind your symptoms.
Symptom and Exam Decision Card
Use this card as a starting point. If you are unsure which group you fall into, call an eye doctor's office and describe what you notice.
Get Seen Right Away
- A sudden increase in floaters (the small specks or cobweb shapes that drift through your vision)
- Flashes of light in one or both eyes
- A curtain or shadow over part of your field of vision
MedlinePlus, the National Library of Medicine's health information site, lists these as symptoms of retinal detachment, calls it a medical emergency, and says anyone with these symptoms should see an eye care professional immediately (MedlinePlus: Retinal Detachment). Screen time does not explain them, so do not wait to see whether a break helps. As a precaution, treat any other sudden, unexplained change in your vision the same way and call for advice the same day.
Book an Exam Soon
- Blurry or hard-to-focus vision that does not clear up after a break from screens
- Dry, irritated, or tired eyes that keep coming back, even after you cut back screen time
- Symptoms that are getting worse over weeks rather than easing
- Headaches or eye discomfort that regularly show up with reading or screen work
Why an exam helps here: the management options listed in the BMJ Open Ophthalmology review include correcting refractive error or presbyopia, treating dry eye, and addressing focusing or eye-teaming problems. All of those start with an eye care professional finding out which one applies to you. The TFOS review adds that people with digital eye strain should be given a full prescription for the distances they actually work at, such as a computer screen (sources linked above).
Keep a Routine Exam on the Calendar
Feeling fine does not rule out a problem. The National Eye Institute (NEI) says many eye diseases have no symptoms or warning signs early on, and that a dilated eye exam is the only way to check for many of them early, when they are easier to treat. NEI recommends a dilated exam every 1 to 2 years if you:
- Are over age 60
- Are African American and over age 40
- Have a family history of glaucoma
If you have diabetes or high blood pressure, NEI says to ask your doctor how often you need an exam, and notes that most people with these conditions need one at least once a year (NEI: Get a Dilated Eye Exam).
Try Self-Care First
- Your symptoms are mild, show up only after long screen sessions, and clear up when you rest your eyes
- None of the warning signs above are present
NEI suggests taking a break every 20 minutes, looking at something about 20 feet away, and holding that for 20 seconds (NEI: Keep Your Eyes Healthy). If a few weeks of breaks do not help, move up to the “Book an Exam Soon” group.
What Happens at a Dilated Eye Exam
NEI describes the exam as simple and painless. It includes a test of how clearly you see, a check of your side vision, a check of the muscles that move your eyes, a pupil response test, a measurement of pressure inside the eye, and dilating drops so the doctor can look at the inner parts of the eye. Your vision may be blurry and sensitive to light for a few hours afterward, so NEI suggests bringing sunglasses and asking someone to drive you home (NEI: Get a Dilated Eye Exam).
NEI also has tips for finding an eye doctor if you do not have one yet.
What to Tell Your Eye Doctor
- What you notice, when it started, and whether it is in one eye or both
- Whether it gets better, worse, or stays the same when you stop using screens
- Roughly how many hours a day you use screens and what kind of work you do on them
- Any family history of eye disease, which NEI says to share, and any health conditions such as diabetes or high blood pressure
- Whether you wear glasses or contact lenses and when your prescription was last updated
Where Food Fits In
This is a nutrition site, so here is what the National Eye Institute says: eat plenty of dark, leafy greens such as spinach, kale, and collard greens, and eat fish high in omega-3 fatty acids, such as salmon, tuna, and halibut. NEI also notes that healthy habits like eating well and staying active can lower your risk of conditions such as diabetes and high blood pressure, which can lead to eye problems, and that smoking raises the risk of macular degeneration and cataracts (NEI: Keep Your Eyes Healthy).
Food and habits support overall eye health. They don't help you figure out what is causing a specific symptom. If you are curious about supplements specifically, we cover that topic separately in our article on eye health supplements and digital life. That page contains affiliate links, and whatever you read there, a persistent symptom or a warning sign above is still a reason to see an eye care professional.
Limits of This Guide
- It does not cover every eye condition or every urgent symptom, so use the “unsure, call” rule if something feels wrong.
- Symptoms alone can't distinguish digital eye strain from other causes. An exam can.
- Exam schedules above come from NEI for the general population. Your doctor may recommend a different schedule.
This article is for general education and is not medical advice. A clinician did not write or review it, and you should not use it to diagnose or treat any condition. If you have a concern about your eyes, contact a licensed eye care professional.
Sources
- National Eye Institute, Keep Your Eyes Healthy (page last updated September 11, 2025)
- National Eye Institute, Get a Dilated Eye Exam (page last updated November 26, 2025)
- MedlinePlus, Retinal Detachment
- Sheppard AL, Wolffsohn JS. Digital eye strain: prevalence, measurement and amelioration. BMJ Open Ophthalmol. 2018;3(1):e000146
- Wolffsohn JS et al. TFOS Lifestyle: Impact of the digital environment on the ocular surface. Ocul Surf. 2023