Why Are My Eyes Red?

Red eyes can be a common concern for many, leading to discomfort and sometimes worry. Whether it’s a subtle hint of redness or a more pronounced hue, understanding the reasons behind red eyes is crucial for effective treatment and prevention. Let’s explore the causes of red eyes, including subconjunctival hemorrhage, and what you can do about them.

Woman with light bruising under her eye, looking down, against a red background.

Photo by MART  PRODUCTION

Common Causes of Red Eyes

1. Allergies

Allergies are one of the leading causes of red eyes. When your body encounters allergens such as pollen, dust mites, or pet dander, it releases histamines, which can lead to inflammation and redness. People with seasonal allergies often experience itchy, watery eyes, making them appear red and irritated.

2. Dry Eyes

Dry eye syndrome occurs when your eyes do not produce enough tears or when the tears evaporate too quickly. This condition can be exacerbated by prolonged screen time, air conditioning, or windy conditions. When your eyes are dry, they can become irritated and red, leading to discomfort.

3. Eye Infections

Infections like conjunctivitis (pink eye) can cause significant redness in the eyes. Viral or bacterial infections can lead to inflammation and the appearance of red veins on the surface of the eye. Accompanying symptoms may include discharge, itching, and sensitivity to light.

4. Subconjunctival Hemorrhage

A subconjunctival hemorrhage occurs when a small blood vessel breaks in the eye, leading to a bright red patch on the white part of the eye. This condition can be startling but is usually harmless. Causes can include sudden increases in pressure (such as coughing, sneezing, or heavy lifting), eye injuries, or even certain medications that affect blood clotting. While it may look concerning, subconjunctival hemorrhage typically resolves on its own within a week or two.

5. Contact Lens Use

Wearing contact lenses for extended periods can lead to red eyes. Poor hygiene, wearing lenses while sleeping, or using lenses that don’t fit properly can reduce oxygen flow to the eyes, resulting in irritation and redness. Always follow the recommended guidelines for contact lens wear and care.

6. Eye Strain

In today’s digital age, eye strain has become increasingly common. Prolonged use of screens without breaks can lead to a condition known as digital eye strain or computer vision syndrome. Symptoms include red, tired eyes, blurred vision, and discomfort.

When to Seek Medical Attention

While red eyes are often harmless, there are certain situations when you should consult a healthcare professional. If you experience severe pain, significant vision changes, or if your red eyes are accompanied by swelling or discharge, it’s essential to seek medical advice. Additionally, if you notice persistent or worsening redness, especially with subconjunctival hemorrhage, it’s wise to consult an eye care specialist.

Woman using eyedrops while sitting on a bed with a laptop in front of her.

Photo by Karolina Kaboompics

Tips for Relieving Red Eyes

1. Use Artificial Tears

For those suffering from dry eyes, over-the-counter artificial tears can provide much-needed relief. These drops help lubricate the eyes and reduce redness caused by dryness.

2. Apply a Cold Compress

A cold compress can help soothe inflamed eyes. Soak a clean cloth in cold water, wring it out, and place it over your closed eyes for a few minutes to reduce redness and irritation.

3. Limit Screen Time

Taking regular breaks from screens can help alleviate eye strain. The 20-20-20 rule is a great guideline: every 20 minutes, look at something 20 feet away for at least 20 seconds.

4. Manage Allergies

If allergies are the culprit, consider over-the-counter antihistamines or allergy eye drops. Additionally, keeping your living space clean and minimizing exposure to allergens can help.

5. Practice Good Contact Lens Hygiene

If you wear contact lenses, ensure you follow proper hygiene practices. Wash your hands before handling lenses, use the recommended solution for cleaning, and avoid wearing them while sleeping unless specified by your eye care professional.

Optometrist using a slit lamp to examine a girl's eyes.

Photo by Antoni Shkraba

Conclusion

Red eyes can stem from various causes, including allergies, dryness, infections, subconjunctival hemorrhage, contact lens use, and eye strain. If redness persists or worsens, don’t hesitate to consult with a healthcare professional to ensure your eyes remain healthy and comfortable. Remember, taking care of your eyes is an essential part of overall well-being!

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Photograph of Dr. Steven Liem

Dr. Steven Liem

Dr. Steven Liem, O.D., F.A.A.O. is an optometrist based in Pasadena, California. After obtaining his doctorate from UC Berkeley’s School of Optometry, he completed his residency in Pediatrics, Vision Therapy & Rehabilitation and became a Fellow of the American Academy of Optometry. When he isn’t busy streaming or making Youtube videos about video games, Dr. Liem aims to broaden accessibility to vision health through his involvement in optometric industry and tech.