Why Are My Eyes Red? Common Causes and When to Get Checked

Why Are My Eyes Red? Common Causes and When to Get Checked
Red eyes are one of the most common reasons people visit an eye doctor — and one of the most Googled eye health complaints. They can appear suddenly after a morning of yard work, build gradually over a week of long office hours, or show up out of nowhere without any obvious explanation.

The redness itself is caused by the dilation and inflammation of the tiny blood vessels on the surface of the eye. But what triggers that inflammation can vary widely — from something as simple as a poor night of sleep to conditions that need prompt professional treatment.

At Cypress Vision Optometry in Cypress, TX, Dr. Hue Tran sees red eye patients regularly and understands that most people just want a clear answer: what is causing this, and what do I do about it? Here are the most common causes of red eyes and the signs that tell you it is time to call the eye doctor.

5 Common Causes of Red Eyes
1. Allergies
Eye allergies — also called allergic conjunctivitis — are one of the leading causes of chronic red eyes in the Houston and Cypress area. The Gulf Coast's combination of year-round pollen, cedar, ragweed, mold, and grass allergens makes allergic eye disease particularly common here. When allergens come into contact with the surface of your eye, your immune system releases histamine, causing the blood vessels to dilate and produce redness, itching, watering, and a burning sensation.

Allergic red eyes are usually bilateral — affecting both eyes equally — and are often accompanied by nasal allergy symptoms like sneezing and congestion. Treatment options include antihistamine eye drops, prescription anti-inflammatory drops, and avoiding known allergen triggers. If over-the-counter drops are not providing adequate relief, Dr. Tran can prescribe more effective options.

2. Dry Eye Disease
Dry eye is another extremely common cause of chronic redness in the Cypress area. When your tear film is unstable or insufficient, the surface of the eye becomes irritated and inflamed, causing the blood vessels to dilate and the eyes to appear persistently red — often accompanied by burning, grittiness, and fluctuating vision.
Counterintuitively, dry eyes can also produce excessive tearing as the eye tries to compensate for the lack of a stable tear film. Many patients are surprised to learn that watery, red eyes can actually be a sign of dry eye disease rather than overproduction of tears. A comprehensive dry eye evaluation at Cypress Vision Optometry can identify the specific type of dry eye and build an effective treatment plan.

3. Pink Eye (Conjunctivitis)
Conjunctivitis — commonly known as pink eye — is an inflammation of the conjunctiva, the clear membrane that covers the white of the eye and lines the inside of the eyelid. It can be caused by a bacterial infection, a viral infection, or allergens, and each type presents slightly differently.
Viral conjunctivitis is the most common form and is highly contagious. It typically causes watery discharge, redness, and a gritty sensation, and usually resolves on its own within one to two weeks. Bacterial conjunctivitis produces thicker, yellow-green discharge and generally responds well to antibiotic eye drops. If you wake up with your eyelids stuck together and significant discharge, a same-day eye exam is strongly recommended.

4. Contact Lens Overwear or Poor Lens Hygiene
Wearing contact lenses for longer than recommended — whether that means wearing daily lenses for multiple days, sleeping in lenses not designed for overnight wear, or failing to replace lenses on schedule — deprives the cornea of oxygen and creates an environment where bacterial infection and inflammation can thrive. The result is red, irritated, uncomfortable eyes that signal a serious warning from your visual system.
Contact lens-related red eye should never be dismissed. Corneal infections from improper contact lens use can cause permanent scarring and vision loss if not treated promptly. If your eyes are red and you wear contacts, remove your lenses immediately and schedule an eye exam at Cypress Vision Optometry the same day.

5. Eye Strain and Irritation
Extended screen time, insufficient sleep, smoke exposure, chlorine from swimming pools, or prolonged time in dry, air-conditioned environments can all cause temporary eye redness from surface irritation. This type of redness is usually mild and resolves with rest, lubricating eye drops, and removing the irritant source. However, if redness from eye strain is occurring daily, it is a signal that an underlying issue — such as dry eye or an outdated prescription — may be making your eyes more vulnerable to irritation.

When Should You See an Eye Doctor for Red Eyes?
Many cases of mild redness resolve on their own within 24 to 48 hours. However, you should schedule an eye exam promptly — or seek emergency care — if your red eyes are accompanied by any of the following:

• Pain or significant discomfort in or around the eye
• Sudden vision changes, blurry vision, or sensitivity to light
• Thick yellow, green, or white discharge from the eye
• A feeling that something is stuck in your eye that does not resolve
• Redness that is getting worse rather than better after 48 hours
• Redness following an eye injury, chemical splash, or foreign body exposure
• Redness in a contact lens wearer — remove lenses immediately and call us

These symptoms can indicate conditions such as corneal infection, uveitis, or acute angle-closure glaucoma — all of which require prompt professional evaluation to prevent permanent vision loss

What to Expect at a Red Eye Exam at Cypress Vision Optometry
When you come in for a red eye evaluation, Dr. Tran will take a detailed history of your symptoms, examine the front and back of your eyes using a slit lamp, check your intraocular pressure, and evaluate the health of your cornea, conjunctiva, and eyelids. Based on the findings, she will identify the cause and recommend the most appropriate treatment — whether that is prescription eye drops, a change to your contact lens routine, dry eye therapy, or a referral if needed.

Most red eye visits are straightforward and resolved quickly with the right diagnosis and treatment. The key is not to wait too long — red eyes that are ignored or treated with the wrong over-the-counter product can become significantly worse.

Red Eye Treatment in Cypress, TX

At Cypress Vision Optometry, Dr. Hue Tran provides same-week and urgent appointments for red eye concerns. Whether your redness is from allergies, dry eye, an infection, or contact lens issues, we will identify the cause and get you on the right treatment quickly.

We serve patients from Cypress, Bridgeland, Towne Lake, Fairfield, Katy, and the surrounding communities. Do not let red eyes go unchecked — book your appointment today.

Red eyes that won't go away deserve a real answer. Schedule your eye exam at Cypress Vision Optometry in Cypress, TX today. Book Now →