Clear vision is vital in daily life, allowing us to observe the world around us. Diminished vision can signal various eye conditions and other health issues. Here are six common causes of blurred vision in one eye.

Eye infections

Bacteria, fungi, or viruses can cause infections in one or both eyes. Symptoms may include blurred vision, redness, itching, swelling, pain, eye discharge, or crusting. Conjunctivitis (pink eye) is a common form. Other types of infections can be more severe if left untreated. Treatment involves eye drops, ointments, or oral antibiotics, depending on the cause.

Migraine headaches

Migraine is a common chronic condition causing severe pain (often on one side, throbbing) that lasts about 4-72 hours. Symptoms can include blurred vision, temporary vision loss, seeing zigzag lines or unusual shapes, and difficulty speaking.

Patients can use pain relievers to alleviate symptoms during acute attacks. For frequent recurrences, doctors may prescribe specific medications to control and reduce the frequency of attacks.

Cataracts

This condition occurs when the eye's lens becomes cloudy, making it difficult for light to reach the retina and leading to diminished vision. The most common cause is the aging process.

Common symptoms include blurred vision or a hazy film over the eyes, dulled colors, difficulty seeing at night, double vision, and halos around lights. Currently, the only treatment is surgical replacement of the cloudy lens with an artificial one.

Age-related macular degeneration

Age-related macular degeneration (AMD) is a condition affecting the macula—the central part of the retina responsible for detailed vision. The disease has two main forms: wet and dry. Wet AMD occurs when abnormal blood vessels grow behind the retina and leak fluid or blood; an early sign can be straight lines appearing wavy. Dry AMD is more common (accounting for about 70-90% of cases) and results from the macula thinning with age.

Currently, there is no complete cure, but the disease's progression can be slowed by quitting smoking, maintaining a healthy diet, exercising regularly, and effectively managing blood pressure and cholesterol.

Diabetes

Blurred vision can be a sign of eye complications from diabetes, such as diabetic retinopathy, macular edema, cataracts, or glaucoma. Patients may experience fluctuating vision throughout the day, dark areas in their field of vision, reduced color discrimination, and seeing floaters or flashes of light. People with diabetes should have a dilated eye exam at least once a year for early detection of damage.

Stroke

A stroke occurs when blood flow to the brain is blocked or a blood vessel ruptures. Warning signs can be remembered using the F.A.S.T. rule: facial drooping (Face), arm weakness (Arm), speech difficulty (Speech), and time to call emergency services (Time). Sudden blurred vision can also be a symptom of stroke and requires urgent medical attention.

Covid-19

Some people with Covid-19 may develop conjunctivitis, causing blurred vision, red eyes, watery eyes, and a gritty sensation. The illness can also be accompanied by symptoms such as fever, cough, shortness of breath, fatigue, muscle aches, loss of taste or smell, sore throat, nasal congestion, nausea, or diarrhea.

Bao Bao (According to Medical News Today)