Why does vision get blurry as we age?

Bgn admin

2025.11.14

Why does vision get blurry as we age? Many people start noticing changes in their 40s, 50s, or 60s: reading becomes harder, night driving feels uncomfortable, and lights seem to have a soft halo around them.

These changes are gradual, and because they happen slowly, most people assume it’s just fatigue or normal aging. But inside the eye, something very specific is happening.

At the center of this process is the crystalline lens — the clear, flexible part of the eye responsible for focusing light. When we are young, this lens is transparent and adjusts easily when we shift our vision from near to far. Over time, however, the lens begins to lose flexibility and clarity.

Natural proteins inside the lens start to clump together, and this slowly turns the once-clear lens into something more like frosted glass.

This loss of clarity is the beginning of a cataract. It causes light to scatter instead of focusing sharply on the retina.

As a result, vision becomes hazy, colors look faded, night vision declines, and bright lights create glare. People often describe the feeling as “looking through a dirty window,” even though the change happens so gradually that it can be hard to notice at first.

Cataracts are not something a person “catches.” They are a natural part of aging — almost everyone will develop them if they live long enough.

The brain adapts to slow vision changes, which is why many people do not realize how much clarity they’ve lost until the cataract becomes advanced or begins to interfere with daily activities.

Once the clouding reaches a certain point, glasses no longer help, and the only way to restore vision is to replace the cloudy lens with a clear artificial one. Modern cataract surgery is highly precise, minimally invasive, and often results in clearer vision than the person had years before.


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