The screen time question: What to ask and when to look deeper

“Is all this screen time hurting my child’s eyes?”

It’s a familiar question in optometry practices. Between schoolwork, recreation, and social life, screens are now embedded in children’s lives, and parents are becoming increasingly concerned about their impact. Symptoms and behaviors such as headaches, tired eyes, blurred vision, eye rubbing, and sitting very close to a screen are frequently attributed to screen use. And although screens can certainly contribute to visual symptoms, they may also expose an underlying pediatric vision problem.

As optometrists, it is our job to determine what is really driving those symptoms. Knowing when to look deeper, taking a more useful screen-related history, and providing practical, evidence-based guidance can help us address parents’ concerns without unnecessarily demonizing screens.

Screens and myopia: Look at the whole picture

One of the most common parent concerns, and one receiving significant research attention recently, is whether increasing digital-device use is contributing to childhood myopia. A 2025 systematic review and meta-analysis by Ha et al found that each additional hour of daily digital screen time was associated with a 21% higher risk of myopia.¹ However, this association does not establish causation. To understand where screens fit into myopia risk, it is important to look at the child's broader visual environment and behavior.

Myopia has been associated with very close working distances (< 20 cm) and continuous near work longer than 45 minutes.^2,3 While digital screen use often overlaps with these behaviors, they are certainly not exclusive to screens. The research indicates that how near work is performed is the key, not whether it is performed on a screen. What the child is doing when they are not engaged in near work matters too. Outdoor exposure remains one of the most consistently supported modifiable factors in the development of myopia. A 2024 meta-analysis by Li et al found that increased outdoor time was associated with a lower risk of myopia onset, although it’s important to note that it did not significantly slow progression in children who were already myopic.⁴

Finally, the child's underlying risk matters. Parental myopia increases a child’s risk, particularly when both parents are myopic, and refractive trajectory can provide another important clue.³ A child with heavy near-work exposure, little outdoor time, 2 myopic parents, and decreasing hyperopia deserves substantially more attention than screen time alone.

Taken together, the evidence suggests that screen time is one piece of the child’s overall myopia risk profile, not an isolated risk factor.

When the screen becomes a stress test

Parents often attribute symptoms such as headaches, tired eyes, and blurred vision to prolonged screen use. There is evidence to suggest that prolonged digital-device use is associated with changes in accommodative and vergence function.⁵ But perhaps in many cases, the screen is serving as a visual stress test, revealing an underlying visual problem rather than creating one.

A child may have 20/20 distance acuity and still have a clinically significant near-vision problem. Symptoms should drive the exam. Complaints such as headaches or eye strain with near work, diplopia, blurred vision at near or when shifting focus from near to distance, closing or covering an eye, and reduced tolerance for sustained near work should raise suspicion for an underlying refractive, accommodative, binocular, or oculomotor problem. When history warrants it, expand the exam beyond acuity and refraction to include appropriate accommodative, binocular, and oculomotor testing.

Don’t overlook the ocular surface

Another often-overlooked potential cause of screen-related symptoms is dry eye. Children do not necessarily complain of “dry eyes.” Instead, they may present with eye rubbing, frequent or forceful blinking, redness, tearing, fluctuating vision, or eye fatigue.⁶ When these symptoms occur with screen use, parents may naturally attribute them to the screen itself.

There is evidence that screen use can contribute to ocular surface changes in children. A 2025 study found that increased screen time in children was associated with a reduced blink rate and shorter tear breakup time.⁷ Meibomian gland dysfunction has also been associated with screen use,⁸ and allergic conjunctivitis is recognized as an important factor in pediatric dry eye.⁶ When a child presents with rubbing, blinking, tearing, fluctuating vision, or eye fatigue during screen use, consider whether underlying ocular surface disease may be contributing to the complaint.

The blue light question

And what about blue light? Parents frequently express concerns about potential eye damage from blue light and ask about the benefits of blue-light-filtering glasses. Current evidence has not demonstrated a clear benefit of blue-light-filtering glasses for reducing digital eye strain. Evidence specifically supporting their use in children is even more limited.⁹ In addition, the available evidence does not demonstrate retinal damage from ordinary digital-screen blue-light exposure. However, blue light has been shown to influence circadian rhythms, so counseling around nighttime screen use may be beneficial.¹⁰

The 4 Ds: A 60-second screen history

So how does all of this play out in the exam room? When a parent asks, “Is all this screen time hurting my child’s eyes?”, how does the optometrist respond? A lengthy history isn’t necessary. The 4 Ds (duration, distance, downtime, and dryness) provide a quick way to identify behaviors and symptoms that may require further attention and help guide parent education.

Duration: How much and how long at a time?

Ask: Approximately how much time does the child spend on screens and other near work each day? How long do they typically stay engaged without looking away or taking a break?
What it may flag: Myopia risk and excessive accommodative or vergence demand.

Distance: How close is the near work?

Ask: How close does the child typically hold a phone, tablet, book, or other near material? Does the parent notice them moving closer progressively?
What it may flag: Myopia risk, refractive error, or excessive accommodative or vergence demand.

Downtime: Do the eyes get a change of scenery?

Ask: Does the child regularly look away or take breaks during sustained near work? How much time do they spend outdoors?
What it may flag: Prolonged near-work demand and inadequate outdoor time.

Dryness: Are there symptoms of dry eye?

Ask: Does the child experience eye rubbing, frequent blinking, redness or watering, burning or irritation, eye fatigue, or fluctuating blur with near work?
What it may flag: Dry eye, meibomian gland dysfunction, allergy, or other ocular surface disease.

Once the relevant risk factors and symptoms are identified, the focus can shift from screen restriction to healthy visual habits and appropriate evaluation when indicated. For better or worse, screens are an integral part of a child’s life, so provide parents with a positive prescription rather than a screen prohibition. Encourage healthy, evidence-based habits by reviewing appropriate near working distance and discussing the importance of taking visual breaks, spending time outdoors, and blinking regularly during prolonged screen use.^3,8

And the answer is…

Ultimately, the answer to “Is all this screen time hurting my child’s eyes?” is not a simple yes or no. The question opens the door to discussing healthy visual habits while looking more closely for underlying refractive conditions, accommodative or binocular dysfunctions, and ocular surface disease. By asking targeted questions, performing additional evaluation when indicated, and providing evidence-based education, the optometrist can turn a common parent concern into an opportunity to support healthier visual habits and better vision for the child.

References

1. Ha A, Lee YJ, Lee M, Shim SR, Kim YK. Digital screen time and myopia: a systematic review and dose-response meta-analysis. JAMA Netw Open. 2025;8(2):e2460026. doi:10.1001/jamanetworkopen.2024.60026

2. Li SM, Li SY, Kang MT, et al; Anyang Childhood Eye Study Group. Near work related parameters and myopia in Chinese children: the Anyang Childhood Eye Study. PLoS One. 2015;10(8):e0134514. doi:10.1371/journal.pone.0134514

3. Gifford KL, Richdale K, Kang P, et al. IMI - clinical management guidelines report. Invest Ophthalmol Vis Sci. 2019;60(3):M184-M203. doi:10.1167/iovs.18-25977

4. Li D, Min S, Li X. Is spending more time outdoors able to prevent and control myopia in children and adolescents? a meta-analysis. Ophthalmic Res. 2024;67(1):393-404. doi:10.1159/000539229

5. Maharjan U, Rijal S, Jnawali A, Sitaula S, Bhattarai S, Shrestha GB. Binocular vision findings in normally-sighted school aged children who used digital devices. PLoS One. 2022;17(4):e0266068. doi:10.1371/journal.pone.0266068

6. Stapleton F, Velez FG, Lau C, Wolffsohn JS. Dry eye disease in the young: a narrative review. Ocul Surf. 2024;31:11-20. doi:10.1016/j.jtos.2023.12.001

7. Shah M, Natarajan SB, Ahmad N. Excessive screen time exposure leads to dry eyes and inflammatory conjunctivitis in children. Ir J Med Sci. 2025;194(2):597-602. doi:10.1007/s11845-025-03920-9

8. Wolffsohn JS, Lingham G, Downie LE, et al. TFOS lifestyle: impact of the digital environment on the ocular surface. Ocul Surf. 2023;28:213-252. doi:10.1016/j.jtos.2023.04.004

9. Singh S, Keller PR, Busija L, et al. Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults. Cochrane Database Syst Rev. 2023;8(8):CD013244. doi:10.1002/14651858.CD013244.pub2

10. Cougnard-Gregoire A, Merle BMJ, Aslam T, et al. Blue light exposure: ocular hazards and prevention - a narrative review. Ophthalmol Ther. 2023;12(2):755-788. doi:10.1007/s40123-023-00675-3