What causes blurry vision and difficulty seeing clearly?

Blurred vision may be caused by factors such as eye strain, aging, refractive errors, keratitis, or cataracts. It is recommended to seek timely medical attention to determine the underlying cause and receive appropriate treatment under the guidance of a qualified physician. Specific analyses are as follows:

1. Eye strain

Prolonged use of electronic devices, reading, or working can easily lead to eye fatigue, resulting in blurred vision. It is advisable to take regular breaks for the eyes—ideally looking into the distance every 50 minutes—and to use eye-protecting products to relieve ocular fatigue.

2. Aging

With increasing age, the eye's ability to adjust focus may gradually decline, commonly leading to presbyopia, which manifests as blurred near vision. Wearing reading glasses is recommended to correct vision and alleviate these symptoms.

3. Refractive errors

These primarily include myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. Myopia and hyperopia are caused by abnormalities in the eye's refractive system, preventing light from focusing accurately on the retina, thus causing blurred vision. Astigmatism results from an irregular curvature of the cornea or lens, causing light to scatter and impairing visual clarity. These refractive issues can usually be corrected with eyeglasses.

4. Keratitis

Keratitis may be associated with factors such as chronic alcohol consumption or excessive fatigue. The condition can cause eye redness and swelling, affecting the eye's refractive function and leading to blurred vision. Patients are advised to follow medical instructions and use medications such as acyclovir eye drops, natamycin eye drops, or cyclosporine eye drops for treatment.

5. Cataracts

Cataracts refer to vision impairment caused by clouding of the eye's lens. With age, the lens may gradually become opaque, obstructing light transmission and leading to blurred vision. Additional symptoms may include sensitivity to bright light and progressive vision loss. Timely medical intervention, such as extracapsular cataract extraction surgery, is recommended.

In daily life, it is advisable to drink plenty of warm water, maintain adequate sleep, engage in moderate physical exercise (such as walking or jogging), and spend time viewing green vegetation, all of which may benefit recovery and overall eye health.