Reviewed for accuracy by Justin Bazan, OD on September 14, 2026.

Eye-care myths tend to stick around because they sound plausible. Some are harmless. Others can make people worry unnecessarily—or delay an exam when something really should be checked.

Here are four common misconceptions worth clearing up.

Myth 1: If you have 20/20 vision, your eyes are perfectly healthy

Fact: 20/20 describes a standard level of distance visual acuity. It does not measure every part of vision, and it does not prove that the eyes are healthy.

A person can read the 20/20 line and still have problems involving peripheral vision, contrast, focusing, eye coordination, the retina, the optic nerve, or other structures.

That is why reading an eye chart is only one part of a comprehensive eye examination.

For a fuller explanation, see What Is 20/20 Vision?.

Myth 2: Wearing glasses makes your eyes weaker

Fact: Properly prescribed glasses do not weaken the eyes or make them dependent on correction.

Glasses change how light enters the eye so vision is clearer while you are wearing them. They do not cause the eye to “forget” how to focus. Prescriptions can change over time because the eyes and visual system change—not because the glasses caused deterioration.

Some people notice blur more once they remove glasses simply because they have become accustomed to seeing clearly with the correction.

See Does Wearing Glasses Weaken Your Eyes? for more detail.

Myth 3: Screens permanently damage your eyes just because you use them a lot

Fact: Long periods of screen use can cause real symptoms such as dryness, eyestrain, headaches, and intermittent blur, but ordinary screen use is not simply “wearing out” the eyes.

Reduced blinking, sustained near focus, poor ergonomics, uncorrected prescription, and long uninterrupted viewing can all contribute to discomfort.

In children, myopia development is more complicated. Genetics and environmental factors matter, and outdoor time is associated with a lower risk of developing myopia. That is different from saying a phone or computer directly damages the eyes through normal use.

Our digital eye strain page explains practical ways to reduce screen-related discomfort.

Myth 4: If nothing is bothering you, there is no reason to have an eye exam

Fact: Some eye conditions can be present before they cause noticeable symptoms.

Glaucoma, early diabetic eye disease, certain retinal findings, and other problems may not produce obvious blur or pain at first. Children can also have meaningful refractive or developmental vision problems without recognizing that their vision is unusual.

How often someone should be examined depends on age, symptoms, medical history, family history, contact-lens wear, prescription, and previous findings. There is not one interval that is ideal for everyone.

A few other myths worth questioning

Be cautious with claims that:

eye exercises can eliminate ordinary refractive errors
a supplement can restore normal vision in any eye condition
retinal imaging always replaces dilation
every red eye needs antibiotic drops
stronger glasses automatically mean the eyes are becoming unhealthy

Each of those statements leaves out important clinical context.

What should you do when you are unsure?

Ask what a finding means, what a test is looking for, and whether a recommendation is necessary now or simply something to monitor. Good eye care should make the reasoning understandable.

Park Slope Eye provides comprehensive eye exams that evaluate both visual clarity and eye health. If you have a specific concern, bring it up during the visit rather than assuming a familiar eye-care saying is accurate.

The simplest rule is this: eye care is usually more nuanced than the myth. When in doubt, find out what is actually happening in your eyes rather than relying on a one-size-fits-all claim.

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