What the research shows about preventing cataracts

You cannot may provide you will never develop cataracts — age and genetics play a role that no behaviour can fully override. But the research is clear that certain habits and choices measurably lower your risk, and some can slow a cataract's progression if one has already started to form.

The strongest evidence points to three areas: protecting your eyes from ultraviolet light, managing blood sugar and blood pressure, and eating foods rich in antioxidants. None of these will eliminate your risk, but together they can delay the onset by years or even decades.

The catch is that prevention works best when you start early — ideally in your 40s or 50s, before a cataract becomes visible. If you already have one, some of these same steps may still slow its growth, though surgery remains the only way to remove it once it affects your vision.

Key Takeaways

  • Wearing sunglasses that block 99 to 100 percent of UVA and UVB rays is one of the most direct ways to reduce cataract risk over decades.
  • Keeping blood sugar controlled through diet and exercise, and managing high blood pressure, both lower the rate at which cataracts form.
  • Foods high in vitamin C, vitamin E, and lutein — such as leafy greens, citrus, nuts, and eggs — have been linked to slower cataract development.
  • Quitting smoking or never starting is one of the few changes that can reduce risk at any age, even if you have already developed an early cataract.

Ultraviolet protection and your eyes

Ultraviolet radiation damages the proteins in your lens over time, and this damage accumulates. The more UV exposure you get across your lifetime, the earlier cataracts tend to appear. Wearing sunglasses that block 99 to 100 percent of both UVA and UVB rays is the most direct way to prevent this damage.

Look for sunglasses labeled as blocking "100% UV" or "UV400" — these terms mean the same thing and indicate complete protection. Wraparound styles offer extra protection because they block light coming in from the sides. Wearing them outdoors year-round, not just in summer, matters: UV rays reflect off snow, water, and pavement, so winter and cloudy days still carry exposure.

If you spend significant time outdoors for work — construction, farming, landscaping — or recreation — hiking, boating, skiing — the protection becomes even more important. The cumulative effect is what drives risk, so consistency over years and decades is what counts.

Blood sugar control and cataract formation

High blood sugar accelerates cataract development, particularly in people with diabetes. When glucose levels stay elevated, the excess sugar enters the lens and converts to sorbitol, a compound that draws water into the lens and causes it to swell and cloud. This process can happen faster in people with uncontrolled diabetes than in the general population.

Keeping blood sugar in your target range — whether through diet, exercise, medication, or a combination — slows this process. If you have been diagnosed with prediabetes or type 2 diabetes, working with your doctor to manage your levels is one of the few interventions shown to delay cataract onset. Even modest improvements in blood sugar control matter over time.

If you do not have diabetes, the same principle applies: maintaining a stable weight, eating a diet lower in refined carbohydrates, and staying physically active all help keep blood sugar steady and reduce your overall cataract risk.

Blood pressure management

High blood pressure is linked to faster cataract development, though the exact mechanism is not fully understood. What is clear from large studies is that people who maintain healthy blood pressure readings develop cataracts later than those with chronic hypertension.

If your doctor has diagnosed high blood pressure, taking prescribed medications as directed is important not just for your heart and kidneys, but also for your eyes. The same lifestyle changes that help control blood pressure — reducing salt intake, exercising regularly, managing stress, limiting alcohol — also support eye health.

Diet and antioxidants

The lens is vulnerable to oxidative damage, which happens when unstable molecules called free radicals accumulate. Antioxidants neutralize these molecules. Several studies have found that people who eat more foods rich in vitamin C, vitamin E, and lutein develop cataracts more slowly than those with lower intakes.

Good sources include leafy greens like spinach and kale (lutein), citrus fruits and berries (vitamin C), nuts and seeds (vitamin E), and eggs (lutein and zeaxanthin). You do not need supplements to see a benefit — whole foods appear to work as well or better, and they carry other health benefits too.

The evidence is not strong enough to say that diet alone prevents cataracts, but eating a diet rich in vegetables, fruits, and whole foods is one piece of a prevention strategy and supports overall health at the same time.

Smoking and cataract risk

Smoking roughly doubles your risk of developing cataracts and can speed up their progression if one has already formed. The damage appears to come from both direct toxins in smoke and from the oxidative stress smoking creates in your body.

Quitting at any age reduces your risk going forward, though the benefit is greatest if you stop before cataracts have started to form. Even if you have already been diagnosed with an early cataract, quitting can slow its growth. If you smoke, this is one of the few changes that can have an when ready protective effect.

Medications and other risk factors

Certain medications increase cataract risk, most notably long-term use of corticosteroids (such as prednisone). If you take steroids regularly for a condition like asthma or rheumatoid arthritis, discuss the risk with your doctor — they may be able to adjust your dose or monitor your eyes more closely.

Eye injuries and inflammation inside the eye can also trigger cataract formation, sometimes years after the injury. Wearing protective eyewear during activities that carry a risk of impact — woodworking, power tools, contact sports — is worth the small inconvenience.

Some eye conditions, such as glaucoma or retinitis pigmentosa, carry a higher cataract risk. If you have been diagnosed with any chronic eye condition, ask your eye doctor what steps you can take to reduce your cataract risk specifically.

When prevention is not enough

Even if you follow all of these steps, you may still develop a cataract — age and family history matter, and some people are straightforward more prone to them. Prevention is about shifting the odds and delaying onset, not eliminating risk entirely.

If you do develop a cataract, the good news is that surgery is highly effective and widely available. In the meantime, regular eye exams — at least every one to two years if you are over 60, or as your eye doctor recommends — will catch any changes early. Knowing what to expect and when to consider surgery is the next step if prevention does not prevent a cataract from forming.

Frequently Asked Questions

Can I reverse a cataract that has already started to form?

No medication or supplement has been proven to reverse a cataract once it has formed. Some research suggests that certain antioxidants may slow progression, but the evidence is weak. Surgery is the only way to remove a cataract and restore clear vision.

Do I need to wear sunglasses on cloudy days?

Yes. UV rays pass through clouds, and they also reflect off pavement, water, and snow. Wearing sunglasses consistently, even when it does not feel sunny, provides better long-term protection than wearing them only on bright days.

Will taking vitamin supplements prevent cataracts?

The evidence for supplements is weaker than for whole foods. Large studies have not shown that vitamin pills prevent cataracts better than eating a diet rich in fruits and vegetables. Whole foods are a safer bet and come with other health benefits.

If my parent had cataracts, am I may provide to get them?

No. Family history increases your risk, but it does not may provide you will develop a cataract. Following the prevention steps in this guide — especially UV protection and managing blood sugar — can delay onset significantly, even if your family history is strong.

How often should I have my eyes checked to catch cataracts early?

If you are over 60, the American Academy of Ophthalmology recommends an eye exam every one to two years. If you are younger but have risk factors like diabetes, high blood pressure, or a family history of cataracts, ask your eye doctor how often you should be checked.