Why do eyes get red?

The most common causes – and when to be concerned

Red eyes are one of the most common eye symptoms and can appear suddenly or gradually. They do not always indicate a serious problem, but they are still a sign that the eye is reacting to irritation, stress, or a condition that deserves attention. Understanding why eyes become red is the first step in taking the right action, avoiding common mistakes, and knowing when it’s time to consult a professional. In this article, we examine the most common causes, the symptoms to watch for, and situations in which a thorough eye examination at ILOP optical centers or with an ophthalmologist is recommended.

The most common causes of red eyes

Redness in the eyes can be caused by numerous factors, not all of which are pathological. The most common include:

Dry eyes
The eye does not produce enough tears, or they evaporate too quickly. This is typical for people who spend many hours at a computer, in air-conditioned environments, or in low-humidity settings.
Seasonal or environmental allergies
Pollen, dust, mites, or animal hair can trigger an inflammatory response, causing itching, tearing, and redness.
Conjunctivitis
This can be viral, bacterial, or allergic. In addition to redness, it often presents with discharge, a burning sensation, and light sensitivity.
Visual fatigue
Extended screen use, prolonged reading, or poor lighting—all of which force the eyes to work excessively—can cause blood vessel dilation and redness.
Incorrect use of contact lenses
Wearing them for too long, not replacing them as recommended, or improper cleaning can irritate the eye surface.
Foreign bodies or minor trauma
Dust, eyelashes, makeup, or accidental bumps can cause redness and involuntary tearing.
Rhinitis and sinusitis
Inflammation of the respiratory tract can affect the blood vessels in the eyes, leading to congestion.
Temperature changes or wind exposure
Especially common in winter or in highly air-conditioned environments.

Many of these factors do not pose a serious risk, but if neglected, they can worsen irritation or cause persistent discomfort.

When to be concerned and what to watch for

Not all eye redness is the same: in some cases, it is only a temporary discomfort; in others, it is a warning sign that requires attention.
Here are the warning signs you should not ignore:

Severe or increasing pain
Redness in only one eye, sudden and pronounced
Blurred or double vision
Strong light sensitivity (photophobia)
Thick or yellowish discharge
Persistent sensation of a foreign body
Noticeably swollen eyelids
Redness that does not improve after 24–48 hours

In these cases, the cause could be more serious: infections, corneal abrasions, increased eye pressure, uveitis, or other conditions that require prompt evaluation by an eye specialist.

How to treat red eyes: good habits and daily care tips

Many episodes of red eyes can be easily relieved with a few simple daily measures. Resting your eyes, especially after long hours in front of screens or digital devices, is one of the first steps: taking regular breaks allows the eyes to recover and reduces stress. Cold compresses can also provide immediate relief by helping to reduce irritation and swelling.

For mild dryness, preservative-free artificial tears can be very helpful in restoring proper hydration to the eye surface. Eyelid hygiene also plays an important role and should be performed daily with gentle products to remove residue, makeup, or impurities that may contribute to inflammation.

Maintaining an adequate level of humidity indoors, using humidifiers when needed, helps prevent the tear film from evaporating due to overly dry air. Finally, it is essential to use contact lenses correctly, following the recommended wearing times, replacement schedules, and cleaning routines to prevent irritation or inflammation caused by improper use.

It is important to avoid improvised solutions such as rinsing with tap water, using vasoconstrictor eye drops without guidance, or DIY remedies, which can worsen the condition or further irritate the eyes.

Il ruolo del controllo visivo professionale

If eye redness becomes frequent, persists for several days, or is accompanied by other symptoms such as pain, light sensitivity (photophobia), or blurred vision, it is essential to consult a specialist for a thorough evaluation. At ILOP optical centers, during a comprehensive eye examination, we analyze several aspects to understand the origin of the problem.

First, we assess the quality of the tear film, which is essential for keeping the eye surface protected and properly hydrated. We then examine the overall condition of the cornea and external eye structures, checking for signs of irritation or inflammation.

We also ensure that lenses and frames are correctly centered, as improper alignment can contribute to discomfort and visual strain. At the same time, we evaluate any visual defects or digital eye fatigue that could exacerbate the symptoms.

If the examination reveals signs of a condition requiring specific medical attention, our team promptly refers the patient to a trusted ophthalmologist for a more detailed evaluation.

Listening to your eyes is the first step to protect them.

Red eyes are not just an aesthetic issue: they are a signal that deserves attention. Understanding the cause and taking the right action helps prevent irritation, infections, and discomfort that can worsen over time.

With regular check-ups, good daily habits, and lenses tailored to your needs, it is possible to significantly reduce the occurrence of redness and keep your eyes healthier and more comfortable.

At ILOP optical centers, we are always ready to help you prevent and care for your visual well-being, offering personalized consultations and customized solutions.

If you want to take a closer look at the health of your eyes, book a comprehensive eye examination at ILOP: the difference is visible… and your eyes will thank you.