Blurry vision after using smartphones

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I cannot see things clearly at hand when I look at my smartphone for a long time.

I cannot see things clearly at hand when I look at my smartphone for a long time! It might be a sign of eye trouble!

What is blurred vision due to excessive use of a smartphone?

When you look at a smartphone or nearby thing for a long time, the “musculus ciliaris” becomes tense and stiff, and the symptom of the deterioration of the focus adjustment function develops.
If the eyes keeps focusing on things at hand and remain tense, you feel your vision deteriorated because the eyes cannot instantaneously get ready to look far.
Today, more and more younger people feel similar symptoms.

Symptoms

Nearby things look blurry although temporarily.
Far vision may be deteriorated, and the eyes may fail to focus on things.

Countermeasures / Improvements

Improve the environment, or take a break to rest your eyes.
Try to blink consciously.
If the symptom does not get better, consult an eye clinic.
Use eyeglasses adjusted to the desired distance of near vision or lenses for supporting near vision.