What causes watery and blurry eyes?

Watery and blurry eyes may be related to physiological or pathological factors. Pathological causes include bacterial conjunctivitis, blepharitis, and others.

I. Physiological Factors

When the eyes are affected by factors such as lack of sleep, excessive eye strain, or exposure to intense light, functional disturbances of the lacrimal glands may occur, leading to involuntary tearing, watery eyes, or blurred vision as physiological responses.

II. Pathological Factors

1. Bacterial Conjunctivitis

After the conjunctiva becomes infected with harmful microorganisms, nearby tissues such as the tear sac and lacrimal gland may also become involved, often resulting in overactivity of secretory function. Affected individuals may experience increased tear production, eye swelling and pain, and blurred vision due to factors like anterior chamber fluid retention and edema.

2. Blepharitis

This condition can cause narrowing or blockage of the eyelid glands, leading to pathological changes such as glandular fluid retention and overflow. Patients may consequently experience symptoms including involuntary tearing, excessive tearing, and blurred vision.

Other conditions, such as diabetic retinopathy, may also trigger the aforementioned symptoms. It is recommended that patients seek medical evaluation at a hospital to determine the exact underlying cause.