Early warning signs of cataracts: how to recognise symptoms early

When do people usually notice cataracts in daily life?

You’re likely to notice early cataract symptoms during ordinary routines and activities. These visual changes aren’t dramatic, which means that you may feel that certain situations are more difficult to navigate than they were before. And you’ll only notice this if you really think carefully about the comparison.

For example, you might feel that text on a phone screen or in a book looks a little softer, particularly in low light. Driving can also highlight early changes because it places high demands on visual clarity. Daytime driving might still feel comfortable, but night driving becomes more tiring. 

These small changes are easy to dismiss at first. But when everyday activities start to require more light or more effort than they used to, it can be an early sign that the eye's natural lens is becoming less clear.

Early cataracts vs more advanced cataracts

Cataracts usually affect your quality of vision rather than the amount you can see, in the early stages. Most people are still able to carry out their usual routines, making adjustments to accommodate their declining visual clarity. 

The clouding of the natural lens will become more noticeable as cataract development progresses. As this happens, your vision may start to seem consistently misty rather than only becoming difficult in certain situations, such as lower light environments. 

How quickly a cataract progresses varies greatly from person to person. Some people can live with mild cataracts for many years before they begin to significantly interfere with their daily life. The changes might be noticeable sooner, though, depending on the visual demands of your work or hobbies.

Different types of cataracts can also affect vision in slightly different ways. Nuclear cataracts develop in the centre of the lens and usually progress slowly. This often causes a gradual reduction in clarity and changes in colour perception over time.

Cortical cataracts form around the outer edges of the lens and tend to affect how light enters the eye. This can make glare from bright lights or headlights more noticeable.

Posterior subcapsular cataracts tend to cause noticeable symptoms sooner in activities like reading or bright-light conditions compared with other cataract types. This is because they form at the back of the lens where light is focused as it enters the eye.

Because cataracts develop differently from person to person, they don’t always require immediate treatment. Surgery is usually considered when changes in vision begin to interfere with daily life rather than simply when a cataract is present.

Self-check: could your symptoms be early cataracts?

There are a few simple checks you can do at home that might help you notice patterns in your vision. These aren’t diagnostic tests, but they might reveal differences that are worth discussing with an optician.

Checking one eye at a time, try comparing how things look in a few everyday situations.

• Try reading the same page of print or the same block of text on a screen with each eye separately, and make sure you use your usual glasses if you wear them. One eye might feel slightly less clear than the other.
• Look at letters, signs, or objects at a distance and compare how clearly they appear with each eye individually. Here, you’re looking for small differences in the clarity of your vision between your eyes. 
• Read the same text under good lighting, then again in a dimmer environment.  If you now need noticeably stronger light to read comfortably, this change is worth noting.
• Spend a few minutes reading on a phone or computer as you normally would. Take note if the text feels harder to focus on, or if one eye becomes uncomfortable more quickly. 
• In a safe setting, pay attention to how lights appear after dark. You might find that headlights or streetlights may appear unusually bright or produce glare. This could be especially true when comparing one eye to the other.

These checks may help you recognise patterns in your vision, but they can’t diagnose the cause. Cataracts can only be confirmed during a professional eye examination. 

What happens if cataracts are confirmed?

If cataracts are found during an eye examination, the next step is to determine how much they’re affecting your vision.

Many people can continue their usual routines without needing treatment straight away in the early stages. In this case, cataracts can be monitored during routine eye checks so that your eye specialist can track how your vision changes over time.

Cataract surgery replaces the cloudy natural lens with a clear artificial one. The timing of that decision depends on how much the cataract affects your daily life, as well as on visual tests and health checks. 

For many people, the biggest benefit of a diagnosis is simply knowing exactly what is happening, rather than wondering why their sight feels different.

Frequently asked questions

How do I know if I have cataracts or just need new glasses?

It can be difficult to judge this based on your symptoms alone. Glasses may help if the only noticeable change in your vision is focus. But if your vision still feels misty or you find that glare is getting worse then it’s possible cataracts might be the case. The only way to definitely know the cause of visual changes is to have an eye examination.

Are cataracts always age-related?

Ageing is the most common cause of cataracts, but they can develop for other reasons as well. Cataracts sometimes occur in younger people, particularly after an eye injury or when certain risk factors are present. These can include conditions such as diabetes, long-term steroid use and smoking.

Next steps

Changes in your eyesight can be easy to miss at first, especially when they come on gradually. Key signs to look out for include text that seems less clear, lights that may feel more glaring, or reading that becomes more tiring than before.

If something about your vision feels different, it’s worth having your eyes examined so the cause can be identified properly.

Understanding what’s happening with your vision makes it much easier to decide what to do next. At OCL Vision, a specialist eye examination can confirm whether cataracts are present and assess how they are affecting your sight. Your specialist can then advise whether monitoring or treatment is appropriate.