Rosacea is a chronic inflammatory acneiform skin condition that primarily affects the centrofacial and periocular regions. Most frequently found in patients 30-60 years old and is up to three times more common in women. According to the National Rosacea Society estimates, 16 million Americans suffer from acne rosacea, and 58%–72% of rosacea patients develop ophthalmic findings. There are four distinct subtypes, with type IV being ocular rosacea. The hallmarks of ocular rosacea include bilateral chronic blepharitis, meibomian gland dysfunction, and chronic scarring. There are subsequent tear film instability and debris, tearing, discomfort, photophobia, keratitis, and blurred vision. Some patients also develop recurrent chalazia secondary to meibomian gland dysfunction. Symptomatically patients may complain of burning and foreign body sensation. Left untreated, recurrent episodes can lead to peripheral corneal ulceration, corneal scarring , and neovascularization.
Rosacea is a chronic inflammatory acneiform skin condition that leads to erythema of the skin on the face and neck. It can frequently involve the eyes with studies showing ocular involvement in 6 to 58% of patients. It is characterized by a malar rash, which can include papules and pustules on the face and neck. The hallmarks of ocular rosacea include bilateral chronic blepharitis and meibomian gland dysfunction. At the slit lamp, eyelid margin telangiectasia, and inspissation of the meibomian glands are seen. Patients frequently develop evaporative dry eye. Some patients develop recurrent chalazia. Symptomatically patients may complain of burning and foreign body sensation. Left untreated, recurrent episodes can lead to peripheral corneal ulceration, corneal scarring, and neovascularization.
Rosacea is thought to be an inflammatory condition with altered immune system responses and vascular dysregulation. Patients with ocular rosacea have abnormally enhanced sensitivity to common environmental stimuli, such as sun exposure, extremes of weather, spicy foods, heated beverages, emotional stress, strenuous exercise, alcohol and caffeine consumption (vasodilatory effects), certain cosmetics, medications (amiodarone, niacin, beta blockers, topical steroids, nasal steroids), high doses of vitamins B6 and B12, and dairy products. These factors contribute to activation of the inflammatory response and immune system, which expresses an enhanced level of Toll-like receptor 2 (TLR2) in the epidermis. Upregulated TLR2 in keratinocytes leads to an increase in activity of an enzyme serine protease, KLK5, which has a role in cathelicidin production. Cathelicidin in turn causes an increase in the vascular endothelial growth factor (VEGF) level in epidermal keratinocytes leading to vascular endothelial changes and angiogenesis. Its corneal effects include increased matrix metalloproteinase production by corneal stromal fibroblasts and epithelial cells.
Additional sources of inflammation include elevated levels of interleukin-1a and b, gelatinase B (metalloproteinase-9) and collagenase-2 (MMP-8) in the tear fluids of patients with ocular rosacea. Elevated serum level of Tumor necrosis factor (TNF-alfa) and overexpression of ICAM-1 (intercellular adhesion molecule 1) and HLA-DR in conjunctival epithelial cells of these patients is also observed.
Facial features of rosacea include erythematous changes involving the malar region, nose, and eyelids. These characteristic changes range from mild discoloration to severe, violaceous changes to skin tone. Telangiectasias are another defining feature in this region. Some clinical presentations may include papulopustular changes.
Slit-lamp examination of the eyelid margins reveals telangiectasia and erythema of the lid margin in 50–94% of patients. Meibomian gland dysfunction is present in up to 92% of rosacea patients and is characterized by excess, abnormally turbid meibomian gland secretion, which causes plugging of the gland orifices and recurrent hordeolum/chalazion. Additionally, the ocular surface inflammation leads to interpalpebral bulbar conjunctival hyperemia, as well as follicular and papillary reaction.
Rhinophyma of the nose can occur as a late finding. Corneal alterations are also detected in 25–50% of patients with ocular rosacea and may range from mild punctate epithelial keratitis accompanying the blepharoconjunctivitis to corneal neovascularization, infiltration, ulceration and perforation.
One potential severe complication on the spectrum of rosacea, Morbihan syndrome can present as insidious swelling of the forehead, nose, glabella, cheeks and periorbital regions of the face. Common additional signs, similar to rosacea include erythema, telangiectasias, papules, pustules and facial flushing.
Originally, rosacea was classified by subtype by the National Rosacea Society Expert Committee:
Recently, the Global Rosacea Consensus Panel proposed both major and minor features that would classify rosacea. Diagnostic features are a persistent centrofacial erythema associated with periodic intensification by potential trigger factors and phymatous changes. Major features: flushing/transient centrofacial erythema, inflammatory papules and pustules, telangiectasia, and ocular manifestations (lid margin telangiectasia, blepharitis, and keratitis/conjunctivitis/sclerokeratitis). Minor features: burning sensation of the skin, stinging sensation of the skin, edema, and dry sensation of the skin. Ocular manifestations may appear in the absence of other diagnostic phenotypes.
- Lupus erythematosus
- Herpes simplex keratitis
- Seborrheic or contact dermatitis
- Morbihan Syndrome (often associated with Rosacea)
- Atopic dermatitis
- Blepharoconjunctivitis associated with other causes
Conservative management includes lifestyle modification (avoidance of triggers), warm compresses, eyelid scrubs, and digital massage. Medical management varies depending on severity. To relieve the dry eye associated with ocular rosacea, artificial tears and lubricating agents are used. Systemic, subantimicrobial tetracyclines (doxycycline, minocycline) and macrolides (azithromycin) are thought to decrease inflammation associated with rosacea and are often first-line agents for patients with moderate disease. While antibiotics may present a great treatment option for patients with ocular rosacea, side effects should be considered (vaginal/oral candidiasis, gastrointestinal distress, photosensitivity, teratogenicity, Stevens-Johnson syndrome, and allergies). At the lower doses used for ocular rosacea management, it is postulated that oral antibiotics have a favorable impact on matrix metalloproteinases, interleukins, nitric oxide, activated B-lymphocytes, and collagen abnormalities that have been associated with this disease. Topical metronidazole has a grade A evidence rating for the treatment of mild to moderate inflammatory rosacea, with a small study showing an improvement in rosacea-related eyelid health.
Immunosuppressive agents, such as cyclosporine, have also been used to reduce chronic eyelid and corneal inflammation. Although the medical literature reports mixed results, interventional office treatments include Lipiflow/Intense Pulse Light therapy, meibomian gland expression, and punctal occlusion may be considered. Treatment of chalazia may require excision. Severe ophthalmic disease may require ocular surface reconstruction (amniotic membrane placement, conjunctival flap, tissue adhesives), and penetrating keratoplasty for corneal perforation.
Future interventions may include novel therapies for various cytokines, chemokines, and angiogenesis factors. Chemodenervation (i.e. Botox) has recently been trialed for rosacea management, hypothesized to inhibit vasodilatory mechanisms. As our knowledge of the cellular and molecular basis for ocular rosacea grows, the management will most likely transition to a highly-selective and more targeted approach.
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