Most of us think about protecting our eyes from the sun—but what about the light we see after dark?

A growing body of research suggests that extremely bright artificial light late in the evening may do more than interfere with sleep. It could also play a role in long-term eye health.

A recent study followed more than 82,000 adults for nearly eight years and found that people who were regularly exposed to very bright light between approximately 8:00 p.m. and 11:30 p.m. were more likely to develop several common age-related eye conditions.

While more research is still needed, the findings highlight another reason to pay attention to your evening lighting habits.

Your Eyes Help Regulate Your Body Clock

Your eyes do much more than help you see.

Specialized cells inside the retina detect changes in light throughout the day and send signals to your brain that help regulate your circadian rhythm—your body's internal 24-hour clock.

Natural daylight helps promote alertness, while darkness signals that it's time to prepare for sleep.

Artificial lighting has made modern life more convenient, but prolonged exposure to very bright light late in the evening may interfere with these natural biological rhythms.

What the Study Found

Researchers analyzed health and light exposure data from more than 82,000 adults who were free of major eye disease when the study began.

Participants wore wrist devices that continuously measured their light exposure throughout the day and evening. Researchers then followed their health for nearly eight years.

People who were consistently exposed to very bright evening light—approximately 1,000 lux or more—between 8:00 p.m. and 11:30 p.m. had a higher likelihood of later developing several age-related eye conditions.

The study reported associations with:

• Age-related macular degeneration (AMD)
• Cataracts
• Primary open-angle glaucoma

Researchers also observed that longer exposure to very bright light was associated with greater risk.

It's important to note that this was an observational study, meaning it identified associations rather than proving that bright evening light directly caused these conditions.

How Bright Is 1,000 Lux?

The good news is that most people don't encounter this level of brightness from everyday household lighting.

Typical indoor lighting ranges from roughly 100 to 500 lux, which is well below the levels highlighted in the study.

Higher light levels are more commonly associated with:

• Bright electronic displays used at high brightness
• Large televisions viewed in dark rooms
• Powerful office or workplace lighting
• Industrial or precision work environments
• Certain commercial LED lighting systems

While normal evening lighting is unlikely to reach these intensities, reducing unnecessary brightness before bed may still support healthier circadian rhythms.

Why Researchers Think Timing Matters

Scientists believe the timing of light exposure may be just as important as the amount.

During the evening, your body naturally prepares for sleep by producing hormones that help regulate your circadian rhythm.

Very bright light—particularly light rich in blue wavelengths—may interfere with this process.

Researchers believe this disruption could contribute to biological changes associated with aging, including:

• Increased oxidative stress
• Changes in cellular energy production
• Inflammation
• Disruption of normal retinal function

These mechanisms are still being studied, but they are already known to play roles in many age-related health conditions.

Simple Ways to Reduce Evening Light Exposure

Fortunately, this is one lifestyle factor that may be easy to adjust.

Consider these habits before bedtime:

• Lower your screen brightness after sunset.
• Turn on Night Mode or blue-light reduction settings on your devices.
• Dim household lighting during the evening.
• Avoid unnecessary exposure to extremely bright lights before bed.
• Give your eyes regular breaks from screens throughout the day.

Small changes can support both healthy sleep habits and a more comfortable visual environment.

The Bottom Line

Modern technology allows us to stay connected long after the sun goes down, but our biology still responds to light much the same way it always has.

This new research suggests that regularly exposing your eyes to extremely bright light late in the evening may be associated with a greater risk of certain age-related eye conditions over time.

Fortunately, protecting your eyes doesn't have to be complicated. Simple habits—like dimming screens, reducing unnecessary brightness, and supporting your vision with good nutrition—can all be part of a healthy routine for years to come.