Should you use cold or warm compress for redness and bloodshot eyes?

Whether to use cold or warm compresses for red eyes with bloodshot vessels depends on the underlying cause. Cold compresses are suitable for redness caused by eye strain, allergies, etc., while warm compresses are better for redness due to meibomian gland dysfunction or poor ocular circulation.

When eyes become strained from overuse, lack of sleep, rubbing, or allergies, the blood vessels in the eyes may dilate and become congested, leading to visible redness often accompanied by dryness and itching. In such cases, a cold compress helps constrict blood vessels, quickly reducing congestion and discomfort. To apply, wrap an ice pack in a clean towel and place it gently over the eyelids—avoid direct contact with the eyeball—and ensure the temperature is comfortable to prevent frostbite. This method effectively alleviates redness caused by vascular dilation.

If redness is accompanied by increased eye discharge and oily eyelid margins, it is often related to meibomian gland dysfunction, and warm compresses are more appropriate. Applying a warm towel at around 40°C (104°F) can improve ocular blood circulation, unclog blocked meibomian glands, promote healthy oil secretion, enhance tear film quality, and thereby reduce redness at its root cause.

In daily life, limit screen time and take breaks every 30 minutes by looking into the distance. Use a humidifier in air-conditioned rooms to maintain proper moisture levels, and avoid rubbing your eyes. Include foods rich in vitamin A—such as carrots and blueberries—in your diet to help reduce the likelihood of developing bloodshot eyes.