Can Dry Eye Cause Blurred Vision?

Yazar: Op. Dr. Gökay Günay

Many people think blurred vision is related only to refractive error.

For this reason, when they notice a loss of clarity, they may first assume that their prescription has changed or that they need new glasses.

However, in some cases the problem may originate from the ocular surface rather than the refractive error.

Dry-eye disease may underlie blurred vision that changes during the day.

What Is the Relationship Between Dry Eye and Quality of Vision?

A healthy ocular surface is one of the foundations of high-quality vision.

The tear film covering the front of the eye does more than keep the eye moist.

It also helps light enter the eye evenly.

For this reason, disruption of the tear film can affect not only comfort, but also quality of vision.

What Does Dry-Eye-Related Blurring Feel Like?

Blur caused by dry eye is often different from the blur associated with a refractive error.

Some people describe:

  • Clarity that changes during the day
  • Blurred vision after prolonged computer use
  • Vision becoming worse in the evening
  • Brief improvement after blinking
  • Difficulty focusing on text

These symptoms may be particularly common in people who work at screens.

Why Can It Change During the Day?

One of the characteristic features of dry eye is that symptoms can change throughout the day.

In particular:

  • Computer use
  • Looking at a phone screen for long periods
  • Air conditioning and dry environments
  • Tasks requiring sustained concentration

may reduce blinking frequency.

This can cause the tear film to become unstable more quickly and affect quality of vision.

Has My Prescription Changed, or Do I Have Dry Eye?

Sometimes both may be present.

However, when many people seek new glasses, assessment may show that a significant part of the problem originates from the ocular surface.

For this reason, particularly when blurring changes during the day, both refractive error and the ocular surface should be assessed.

Can Vision Improve When Dry Eye Is Treated?

For many patients, improving ocular surface health may lead to a noticeable improvement in visual comfort.

Dry eye should therefore not be regarded only as a condition that causes burning and stinging.

In some people, it may be one of the main factors affecting quality of vision.

Conclusion

Dry eye is not only a comfort problem.

In some people, dry eye may underlie blurred vision, fluctuating vision and changes in clarity during the day.

For this reason, particularly in people with fluctuating blur, it is important to assess the ocular surface in detail as well as the refractive error.