What Eye Problems Can HUVS Cause, and When Is It Urgent?

Hypocomplementemic urticarial vasculitis (HUVS) is a rare condition that can cause inflammation in various parts of the eye. Because some forms of eye inflammation can damage vision quickly if left untreated, it is important to recognize the symptoms and seek prompt medical care ^[1][2].

An important reality of HUVS is that skin findings may not reliably reflect ocular (eye) involvement ^[3]. Case reports have shown that chronic eye inflammation, such as uveitis, can sometimes appear even before the characteristic urticarial rash and systemic symptoms of HUVS become fully evident ^[3]. You should not assume that a mild skin rash means your eyes are safe from inflammation.

Types of Eye Inflammation in HUVS

HUVS can affect different structures of the eye. The specific diagnosis depends on which part of the eye is inflamed:

• Conjunctivitis: Inflammation of the conjunctiva, the clear membrane that covers the white part of your eye and the inside of your eyelids ^[4]. While often called “pink eye,” in HUVS this is caused by inflammation rather than a contagious infection ^[5].
• Episcleritis: Inflammation of the episclera, a thin layer of tissue just beneath the conjunctiva ^[6]. This condition is usually superficial, mild, and self-limiting ^[7].
• Scleritis: Inflammation of the sclera, the deep, tough white outer wall of the eye ^[6][8]. Scleritis is more severe than episcleritis. It typically causes deep, severe eye pain and requires prompt treatment to prevent permanent damage to your eye and vision ^[2][9].
• Uveitis: Inflammation of the uvea, the middle layer of the eye that contains many blood vessels ^[3][10]. Uveitis can occur in the front (anterior), middle, or back of the eye, and untreated uveitis can lead to vision loss ^[11].

Estimates of how common these eye problems are can vary. In one small Swedish study of 16 patients with HUVS, 19% (about 1 in 5) had episcleritis or scleritis at the time they were diagnosed ^[6]. Keep in mind that a red or painful eye can also be caused by infections, allergies, or trauma. Never use leftover steroid eye drops for a new eye issue unless directed by an eye doctor, as steroids can worsen some infections.

When to Seek Emergency vs. Urgent Care

You should not wait for your next routine rheumatology appointment if you develop new eye symptoms. Depending on the severity, you may need immediate emergency care or a same-day urgent assessment from an ophthalmologist (a medical doctor who specializes in eye care).

Seek IMMEDIATE Emergency Care (Go to an emergency department if an eye doctor cannot see you immediately) for:

• Sudden vision loss or rapidly worsening vision ^[12]
• A shadow or “curtain” falling over your field of vision ^[13]
• A painful red eye accompanied by reduced vision ^[14][1]
• The sudden appearance of new floaters (spots or cobwebs) along with flashes of light ^[13]

Seek SAME-DAY Urgent Care (Call an eye doctor for a same-day appointment) for:

• Severe or deep-aching eye pain ^[2]
• Marked or sudden redness in one or both eyes ^[14]
• Increased sensitivity to light (where light actually hurts your eyes, known as photophobia) ^[1]

When you visit the eye doctor, they will likely check your visual acuity (how well you see letters on a chart) and eye pressure. They will use a microscope called a slit lamp to evaluate the front parts of your eye for inflammatory cells ^[1][15]. To examine the back of your eye (the posterior segment), they will give you drops to dilate your pupils and may use specialized imaging to look for deeper complications ^[16].

HUVS Eye Disease vs. Hydroxychloroquine Screening

If your doctor has prescribed hydroxychloroquine (often sold under the brand name Plaquenil) for your HUVS, you will need a specific type of eye screening. Monitoring for HUVS-related eye inflammation is very different from screening for hydroxychloroquine toxicity.

• HUVS Eye Checks: These exams look for active inflammation (like scleritis or uveitis) caused by the disease itself, as described above ^[1].
• Hydroxychloroquine Retinal Screening: Hydroxychloroquine can, over time, cause damage to the retina (the light-sensitive layer at the back of the eye) ^[17]. This toxicity can be silent and cause permanent vision loss before you notice any symptoms ^[18][19].

According to guidelines from the American Academy of Ophthalmology, patients starting hydroxychloroquine should have a baseline retinal exam soon after treatment begins ^[17][20]. Future annual specialized screening—which includes painless scans like Optical Coherence Tomography (OCT) and automated visual field testing to check for blind spots—depends on your risk factors ^[17].

Your risk is based on factors such as your daily dose calculated by your actual body weight, how long you have taken the medication, your kidney function (such as having chronic kidney disease), and whether you take the drug tamoxifen ^[17][21]. For standard-risk patients, annual screening might not begin until after 5 years of treatment, but higher-risk patients may need to start earlier ^[17][20].

Always make sure your eye doctor knows your exact hydroxychloroquine dose, how long you’ve been on it, and if you have any kidney issues. Do not stop taking your medication without discussing it with your prescribing doctor first ^[22].