If you have uveitis and see new flashes of light, contact an eye specialist immediately for urgent assessment. Flashes can sometimes signal a tear or detachment in the retina, the light-sensitive layer at the back of the eye. Seek emergency eye care if you also notice many new floaters, a dark curtain or shadow, or sudden blurred or lost vision. Do not wait for a routine appointment.
What should you do if you have uveitis and see flashes of light?
New flashes of light should be taken seriously, even if you already have a diagnosis of uveitis. The safest next step is to contact your ophthalmologist, an urgent eye clinic, or an emergency eye service for immediate advice and assessment. Explain that you have uveitis and describe when the flashes started. If you cannot arrange a prompt examination, seek care at an emergency department.
The NHS guidance on flashes and floaters recommends urgent assessment for first-time or sudden flashes, an increase in flashes or floaters, or symptoms accompanied by blurred vision or eye pain. These changes can indicate a problem at the back of the eye that needs quick treatment.
Seek emergency eye care immediately if you experience any of the following:
- A sudden increase in the number of floaters, which may look like spots, threads, or cobwebs.
- A dark shadow or curtain moving across part of your vision.
- Sudden blurred vision or loss of vision.
- New flashes accompanied by a noticeable change in your sight, particularly after an eye injury or eye surgery.
These warning signs can occur with a retinal tear or retinal detachment. The National Eye Institute identifies retinal detachment as a medical emergency because delayed treatment can increase the risk of permanent vision loss. Do not wait to see whether the symptoms improve on their own.
Can uveitis cause flashes of light?
Uveitis is inflammation inside the eye that affects the uvea, a layer of tissue beneath the white outer part of the eye. Depending on which areas are affected, it may cause eye pain, redness, sensitivity to light, blurred vision, or floaters. Inflammation involving the back of the eye can affect structures near the retina and the gel-like material inside the eye.
According to the National Eye Institute's information on uveitis, the condition can affect different parts of the eye and may lead to vision loss if left untreated. However, flashes of light should not automatically be attributed to uveitis. They may indicate a separate problem, including a retinal tear or detachment, that requires a different approach to treatment.
Flashes may appear as brief streaks, sparks, or lightning-like shapes, sometimes toward the edge of your vision. They can occur in one or both eyes. Their appearance alone cannot establish the cause, so an eye examination is important even when you have experienced uveitis before.
Which other symptoms should you mention to your eye doctor?
Tell the eye specialist about all your symptoms, not just the flashes. The combination of symptoms, when they began, and how they have changed helps guide the examination. Examples of symptoms associated with uveitis include:
- Eye pain, aching, or discomfort.
- Redness in one or both eyes.
- Increased sensitivity to sunlight or indoor lighting.
- Blurred or reduced vision.
- New or increasing floaters in your field of vision.
Also report any recent eye injury, eye surgery, previous retinal problems, or changes in your prescribed eye medicines. Mention whether the flashes are new, occur repeatedly, or have become more frequent. These details can help the clinician distinguish between possible causes, but do not delay urgent assessment while gathering this information.
What examinations might be needed?
An ophthalmologist will review your symptoms and medical history and examine your eyes. The evaluation may include checking how clearly you see, examining the front of your eye with a microscope called a slit lamp, and looking at the retina and other structures inside the eye.
A dilated eye examination is especially important when a retinal problem is suspected. Eye drops widen the pupils, allowing the doctor to inspect the back of the eye more closely. The American Academy of Ophthalmology advises immediate evaluation by an ophthalmologist when sudden flashes, numerous new floaters, or a shadow in the field of vision raise concern for a torn or detached retina.
Depending on the findings, the clinician may recommend additional tests to assess inflammation or investigate another eye condition. Not every person needs the same tests, and the examination findings determine which further investigations are appropriate.
What should you do while waiting for medical assessment?
Arrange an urgent examination rather than relying on symptom monitoring at home. If your vision is blurred or affected, do not drive yourself. Ask someone to take you to the clinic or emergency department.
If you already use prescription eye drops for uveitis, continue to follow your ophthalmologist's instructions unless they advise you otherwise. Do not start, stop, increase, or change your medication without medical guidance. In particular, do not use leftover steroid eye drops or another person's medication to treat new flashes. The appropriate treatment depends on the cause of the symptoms and the findings of the examination.
While arranging care, note when the flashes began, which eye seems affected, whether you have new floaters, and whether your vision has changed. Bring a list of your current medicines and details of any previous eye diagnoses. These details can help the treating clinician assess your situation.
How is treatment decided when uveitis and flashes occur together?
Treatment depends on what the eye examination shows. If the symptoms are related to active uveitis, an ophthalmologist may prescribe anti-inflammatory medication, such as corticosteroid eye drops, tablets, or injections, depending on the area affected and the underlying cause. If an infection is responsible, treatment may also need to address that infection.
The Mayo Clinic's guidance on uveitis diagnosis and treatment explains that treatment choices vary according to the cause and extent of inflammation. Prescription treatment for uveitis does not replace evaluation for a possible retinal tear or detachment. If a separate retinal problem is found, specific treatment may be needed to protect vision.
Follow-up appointments are important because uveitis can recur, and some treatments require monitoring for complications such as increased eye pressure. Your ophthalmologist can explain the treatment plan, when to return, and which changes in your vision should prompt immediate reassessment.