What causes persistent redness or bloodshot eyes that do not go away?

Red blood vessels in the eyes that persist for a long time may be caused by physiological factors or pathological conditions such as allergic conjunctivitis, keratitis, etc.

I. Physiological Factors

This may result from frequent late nights and prolonged use of electronic devices like smartphones and computers, leading to eye congestion.

II. Pathological Factors

1. Allergic Conjunctivitis

This may occur due to using substandard eyeshadow or personal care products, or exposure to allergens such as pollen or dust mites, triggering allergic conjunctivitis and resulting in conjunctival congestion and swelling.

2. Keratitis

This may be caused by eye injuries, wearing damaged contact lenses, or infections from pathogens such as bacteria or viruses, leading to keratitis. Severe irritation causes local capillary dilation and congestion.

In addition, eye trauma or other conditions could also be responsible. It is recommended to seek timely medical evaluation for proper diagnosis and differentiation.