Researchers say that common vision complaints — including blurry vision, eye strain, and gradual sight decline — may be linked to factors beyond just aging or screen time, and that many Americans are unaware of what may really be affecting their eyes.
Vision impairment affects an estimated 93 million adults in the United States, with blurry vision and eye strain among the most commonly reported complaints.
If you have noticed your vision becoming blurrier over time, or if you experience frequent eye strain, sensitivity to light, or difficulty seeing clearly — especially in low-light conditions — you are far from alone. According to the Centers for Disease Control and Prevention, approximately 93 million American adults are at high risk for serious vision loss, yet only half have visited an eye doctor in the past year.
Despite how widespread vision concerns are, many people spend years attributing their symptoms to aging or screen exposure without ever exploring what may actually be contributing to their declining eyesight. Research in recent years has begun to shed new light on factors that may play a more significant role in eye health than previously understood.
Blurry vision is one of the most commonly reported health complaints in the United States, affecting people across all age groups. While refractive errors — such as nearsightedness, farsightedness, and astigmatism — account for a large share of vision complaints, researchers have increasingly turned their attention to other contributing factors that may affect how clearly and comfortably people see.
Oxidative stress, inflammation, nutritional deficiencies, and circulatory factors have all been identified in research as potentially relevant to eye health. Studies have also highlighted the role of specific nutrients — including lutein, zeaxanthin, and certain antioxidants — in supporting the health of the macula and lens over time.
"Many people experiencing gradual vision decline assume it is simply a natural part of aging — but research suggests that nutritional and lifestyle factors may play a more significant role than most realize."
A growing body of research has highlighted the connection between diet and long-term eye health. The Age-Related Eye Disease Study, conducted by the National Eye Institute, found that certain nutrients — including vitamins C and E, zinc, lutein, and zeaxanthin — may help support eye health and reduce the risk of age-related changes in the macula and lens.
Lutein and zeaxanthin, in particular, are carotenoids found naturally in the retina that act as a kind of internal filter for the eye, helping to protect against oxidative damage from light exposure. Research has suggested that people with higher dietary intake of these nutrients may have better long-term visual outcomes, though individual results can vary significantly.
Foods rich in these nutrients include leafy green vegetables such as kale and spinach, as well as eggs, corn, and certain orange and yellow fruits and vegetables. Omega-3 fatty acids, found in fatty fish and flaxseed, have also been studied for their potential role in supporting tear production and reducing dry eye symptoms.
With the average American now spending more than seven hours per day looking at screens, digital eye strain has emerged as one of the most commonly reported vision-related complaints of the modern era. Symptoms of digital eye strain — including blurry vision, headaches, and dry eyes — are estimated to affect up to 65% of Americans who use digital devices regularly.
Researchers have pointed to reduced blink rate during screen use, increased exposure to blue light, and the sustained focusing effort required for close-up digital tasks as potential contributors to these symptoms. Simple adjustments — such as following the 20-20-20 rule (looking at something 20 feet away for 20 seconds every 20 minutes) and ensuring adequate screen brightness and contrast — are widely recommended as part of a broader eye care routine.
"The connection between what we eat, how we live, and how well we see is increasingly supported by research — suggesting that eye health is not simply a matter of genetics or corrective lenses."
Beyond nutrition and screen habits, researchers are investigating a range of factors that may influence visual health over time. Studies have examined the role of blood sugar regulation in eye health, given the well-documented connection between diabetes and vision changes. Elevated blood sugar levels have been shown to affect the small blood vessels in the retina, potentially contributing to visual disturbances over time.
Researchers are also exploring the potential role of inflammation in age-related vision changes, including conditions like macular degeneration and cataracts. Some studies have suggested that systemic inflammation — influenced by diet, lifestyle, and environmental factors — may contribute to the gradual deterioration of eye tissue over time.
Additionally, there has been growing interest in plant-derived compounds and their potential antioxidant and anti-inflammatory effects on eye tissue. Preliminary research has looked at compounds found in bilberry, ginkgo biloba, and certain Mediterranean plant oils for their potential role in supporting visual function, though more research is needed to fully understand these effects.
Regular eye exams remain the most consistently recommended step for monitoring and maintaining vision health. Eye exams can detect early signs of conditions such as glaucoma, macular degeneration, and diabetic retinopathy — often before symptoms become noticeable.
Sun protection is another widely recommended measure. Prolonged exposure to ultraviolet light has been associated with an increased risk of cataracts and macular degeneration. Wearing sunglasses that block 100% of UVA and UVB rays when outdoors is a simple and effective protective measure.
Staying hydrated supports tear production and may help reduce dry eye symptoms, which are among the most commonly reported vision-related complaints, particularly among older adults and frequent screen users.
Managing chronic conditions such as high blood pressure and diabetes — both of which can affect the blood vessels that supply the eyes — is considered an important part of long-term eye health management by healthcare professionals.
Anyone experiencing sudden changes in vision, significant blurriness, persistent eye pain, or new floaters and flashes of light is encouraged to seek prompt evaluation from a qualified eye care professional. While gradual changes in vision are common, sudden or dramatic shifts in eyesight may warrant immediate attention.
Regular check-ins with an optometrist or ophthalmologist, combined with attention to diet, lifestyle, and screen habits, remain the foundation of long-term eye health maintenance.