Eye redness may be due to uveitis when it occurs with eye pain, sensitivity to light, blurred vision, or new floaters. Uveitis is inflammation inside the eye, and it can sometimes develop quickly. Redness alone cannot tell you the cause, because several eye problems look alike. If redness comes with pain, light sensitivity, or any change in vision, seek urgent same-day eye care.
What does eye redness from uveitis look like?
Uveitis is inflammation of the uvea, the middle layer of tissue inside the eye. This layer includes the iris, which gives the eye its color, as well as structures deeper inside the eye. When inflammation affects the front of the uvea, redness may be noticeable alongside pain and sensitivity to light. However, the appearance of a red eye alone cannot confirm that inflammation is present inside the eye.
According to the National Eye Institute, symptoms of uveitis can include red eyes, eye pain, blurred vision, sensitivity to light, and floaters. The condition may affect one eye or both. Some people develop symptoms suddenly, while others experience a more gradual course.
Which symptoms may occur with uveitis?
Eye redness is more concerning when it occurs with other changes in comfort or vision. These symptoms are examples of what someone with uveitis may experience, not a checklist for identifying the condition independently.
- Eye pain or aching: The affected eye may feel sore or uncomfortable. Pain may become more noticeable during activities such as reading.
- Sensitivity to light: Ordinary indoor lighting or sunlight may feel uncomfortable, and bright light may worsen eye pain.
- Blurred vision: Objects may appear less clear than usual, or vision may seem different from normal.
- Floaters: Small dark spots, specks, or squiggly lines may appear to move across the field of vision.
- Watery eyes: The affected eye may produce extra tears, sometimes alongside redness or discomfort.
- Reduced vision: In some cases, vision may become noticeably worse. Sudden vision loss requires emergency medical attention.
The Mayo Clinic's overview of uveitis notes that warning signs can begin suddenly and worsen quickly, although symptoms sometimes develop more gradually. Because untreated inflammation can damage the eye, new redness accompanied by pain, light sensitivity, or vision changes should be assessed promptly by an eye care professional.
Can you distinguish uveitis from other causes of red eyes?
Not reliably by looking at the eye or comparing symptoms alone. Redness can result from several conditions, and some have symptoms that overlap with uveitis. Dry eyes, allergies, conjunctivitis (pink eye), corneal injuries, and other forms of eye inflammation may all cause a red appearance.
The MedlinePlus guide to eye redness explains that the cause may range from minor irritation to a condition needing urgent care. It also describes acute glaucoma, which can cause intense eye pain and serious visual problems. This is one reason a painful red eye should not automatically be assumed to be pink eye or a simple irritation.
Discharge, itching, watering, and the pattern of redness may provide useful information to a clinician, but none reliably distinguishes every cause. Similarly, redness affecting only one eye does not prove that uveitis is present. A proper eye examination is needed to identify the source of the inflammation or irritation.
When should red eyes be assessed urgently?
Arrange urgent, same-day medical assessment if a red eye occurs with eye pain, sensitivity to light, blurred vision, new flashes or floaters, or unusually intense redness. Do not wait for every possible symptom to appear before seeking help. These features can occur with uveitis and other eye conditions that need prompt treatment.
The NHS guidance on uveitis recommends urgent assessment for eye pain, light sensitivity, vision changes, or very red eyes. Seek emergency care immediately if you experience sudden loss of vision or severe eye pain, particularly when the symptoms begin abruptly or worsen quickly.
Even when the symptoms are less pronounced, persistent, recurring, or unexplained redness should be assessed by a healthcare professional. This is particularly important if the redness is unusual for you or if you have previously experienced uveitis, because the condition can return.
How do doctors determine whether redness is caused by uveitis?
An eye care professional, often an ophthalmologist, assesses the symptoms and examines the eye rather than relying on redness alone. The examination helps identify inflammation inside the eye and distinguish it from problems affecting the surface, such as conjunctivitis or a corneal injury.
The clinician may ask when the redness began, whether it affects one eye or both, whether it has happened before, and whether pain, light sensitivity, or visual changes are present. Medical history is also relevant, including previous eye problems, injuries, infections, surgery, and conditions that can cause inflammation elsewhere in the body.
According to the Cleveland Clinic's guidance on iritis, an eye doctor may check visual acuity and look inside the eye for signs of inflammation or damage. Additional tests may be needed depending on the findings. A dilated eye examination, in which drops widen the pupils, is commonly used to inspect internal eye structures.
If uveitis is identified, the clinician will consider the area affected and whether an infection, an injury, or another medical condition could be involved. The next steps depend on these findings, so it is important not to start leftover prescription eye drops or assume that a treatment used for another red-eye problem is appropriate.
What should you do while arranging an eye examination?
Avoid rubbing or pressing on the affected eye. If you wear contact lenses, remove them and tell the clinician that you use them. Do not drive if your vision is blurred or otherwise impaired. Most importantly, do not delay assessment while waiting to see whether redness improves if pain, light sensitivity, or vision changes are present.
The key distinction is that uveitis involves inflammation inside the eye, which may not be obvious from the external appearance. Redness accompanied by pain, light sensitivity, or changes in vision deserves prompt assessment. An eye examination is the reliable way to determine the cause and decide whether treatment is needed.