Protecting your eyes comes down to a handful of daily habits: blocking UV radiation, managing screen time, eating the right nutrients, avoiding cigarette smoke, and getting eye exams at the right intervals. Most vision loss from preventable causes builds slowly over years, which means the choices you make now have an outsized impact on how well you see decades from now.
Wear Sunglasses That Block UV Up to 400 nm
Ultraviolet radiation damages the cornea, lens, and retina over time. Long-term exposure to UVB rays (280 to 315 nm) is linked to photokeratitis (essentially a sunburn on the surface of your eye), pterygium (a fleshy growth on the white of the eye common in surfers and outdoor workers), and cataracts. UVA rays penetrate even deeper and can contribute to macular degeneration.
When shopping for sunglasses, look for lenses labeled “UV400” rather than just “100% UV protection.” The UV400 standard means the lenses block all light wavelengths up to 400 nanometers, closing a gap between 380 and 400 nm that some less precise labels leave open. This ensures full coverage of both UVA and UVB radiation. Lens darkness and color have nothing to do with UV protection. A pair of clear prescription glasses with a UV400 coating protects better than dark sunglasses with no UV treatment.
Wear sunglasses any time you’re outdoors during daylight, not just on bright summer days. UV exposure is significant on overcast days, at high altitudes, near water, and during winter when snow reflects sunlight back toward your face. A wide-brimmed hat blocks roughly half the UV that reaches your eyes and pairs well with sunglasses for extended time outside.
Reduce Eye Strain From Screens
Hours of close-focus screen work doesn’t cause permanent eye damage, but it does cause digital eye strain: dryness, blurred vision, headaches, and aching around the eyes. The core problem is that staring at a screen reduces your blink rate by as much as half, and holding focus at a fixed close distance fatigues the muscles inside your eye.
Position your monitor at least 20 inches (about 51 cm) from your eyes, roughly an arm’s length. If your screen is larger than 24 inches, add a few more inches of distance. The top of the screen should sit at or slightly below eye level so you look slightly downward, which exposes less of your eye’s surface and slows tear evaporation. The 20-20-20 rule is a practical reset: every 20 minutes, look at something 20 feet away for 20 seconds. This relaxes the focusing muscles and prompts you to blink.
Adjust screen brightness to roughly match the ambient light in the room. A screen that’s much brighter than your surroundings forces your pupils to constantly adjust. If you work in a dim room at night, turn on a desk lamp or bias light behind the monitor rather than relying on the screen as your only light source.
Blue Light and Sleep
Blue light from screens has the strongest impact on your circadian rhythm of any visible wavelength. When blue light hits specialized photoreceptors in your retina during the evening, it suppresses melatonin production and shifts your internal clock later. These photoreceptors don’t respond to red light and barely respond to yellow or orange light, which is why “night mode” settings shift your screen toward warmer tones. The practical takeaway: dimming screens and switching to warm colors in the two hours before bed protects your sleep quality, which in turn supports overall eye health. Blue-light-blocking glasses marketed for daytime use have less evidence behind them.
Eat for Long-Term Eye Health
Two carotenoids, lutein and zeaxanthin, accumulate in the macula (the part of your retina responsible for sharp central vision) and act as a natural filter against damaging light. You get them from dark leafy greens like spinach and kale, egg yolks, and orange peppers. Omega-3 fatty acids from fish support the tear film and may reduce dry eye symptoms.
For people already showing early or intermediate signs of age-related macular degeneration, a specific supplement formula tested in a large National Eye Institute trial called AREDS2 slowed progression to advanced disease. The daily formula contains 500 mg of vitamin C, 400 IU of vitamin E, 10 mg of lutein, 2 mg of zeaxanthin, 80 mg of zinc, and 2 mg of copper (added to prevent a zinc-related copper deficiency). Commercially available versions of this formula are widely sold. These supplements are designed for people with existing macular degeneration, not as a general preventive for everyone.
Stop Smoking or Never Start
Smoking is one of the strongest modifiable risk factors for vision loss. People who smoke are two to three times more likely to develop cataracts and up to four times more likely to develop age-related macular degeneration compared to nonsmokers. The toxins in cigarette smoke damage blood vessels in the retina and accelerate oxidative stress in the lens. Quitting at any age reduces your risk, though it takes years for the elevated risk to fully decline.
Handle Contact Lenses Carefully
Contact lenses sit directly on your cornea, and poor hygiene can introduce bacteria, fungi, or parasites that cause serious infections. Some of these infections, like Acanthamoeba keratitis, can lead to permanent vision damage. The CDC recommends five core habits for lens wearers:
- Wash and dry your hands with soap and water before touching your lenses every single time. Use a clean, lint-free cloth to dry.
- Keep lenses away from all water. Remove them before swimming, showering, or using a hot tub. Tap water and pool water harbor organisms that cling to lens surfaces.
- Rub and rinse lenses with fresh disinfecting solution each time you store them. Never top off old solution with new solution in the case.
- Clean your lens case by rubbing and rinsing it with solution (not water), then store it upside down with the caps off to air dry. Replace the case at least every three months.
- Don’t sleep in your lenses unless your eye care provider has specifically told you it’s safe for your lens type. Overnight wear dramatically increases infection risk because the closed eyelid traps warmth and moisture against the lens.
Wear Protective Eyewear for Sports and Work
Standard glasses and sunglasses shatter on impact. If you play basketball, baseball, or soccer, protective eyewear built to the ASTM F803 standard is designed to absorb hits from balls, hands, elbows, and fingers without breaking into your eye. These protectors fit over prescription glasses or can be made with your prescription built in. The lenses are typically polycarbonate or Trivex, both of which are lightweight and highly impact-resistant.
For home projects involving power tools, yard work, or chemicals, basic safety glasses with side shields prevent the vast majority of eye injuries. The American Academy of Ophthalmology estimates that 90% of workplace eye injuries could be prevented with appropriate protective eyewear. Keep a pair in your garage or workshop so they’re always within reach.
Get Eye Exams at the Right Intervals
Many serious eye conditions, including glaucoma and early macular degeneration, cause no symptoms until significant damage has occurred. Regular exams catch these problems while treatment can still preserve vision.
The American Academy of Ophthalmology’s recommended schedule depends on your age and risk factors. Children should have their eyes assessed during newborn and routine pediatric visits, with vision screenings every one to two years through school age. Healthy adults under 40 with no symptoms or risk factors generally don’t need routine comprehensive eye exams. The exception is people at higher risk for certain conditions: African Americans, for example, face elevated glaucoma risk and should consider exams every two to four years even before age 40. Adults 65 and older should have a comprehensive exam every one to two years.
If you have diabetes, a family history of glaucoma, or high blood pressure, your provider may recommend more frequent visits regardless of your age. A dilated eye exam, where drops widen your pupils so the back of your eye can be examined directly, is the most reliable way to detect disease early.