Scleral vesicles are a common condition, so how do you diagnose scleral vesicles? Here’s how to find out. The characteristic presentation of herpes zoster is an intensely painful, unilateral, not beyond the midline of the body to the other side, single or multiple sensory nerve distribution areas of skin or mucosal herpes. Although the incubation period of the intrinsic virus is not clear, the incubation period of exposure to exogenous virus is usually a few days to a few weeks. Patients present with headache, malaise, chills, fever, and local lymph node swelling 4 to 5 days prior to the herpes. Neuralgia occurs 2 to 3 days before the rash. The rash begins to appear as clusters of fused corn- to soy-sized papules and papules, which soon become blisters with clear fluid and shiny, tense walls, a red halo at the base, and a band-like distribution along the nerves. The skin between the blister clusters is normal and the blisters resolve within 2 weeks, often leaving permanent scarring, varying degrees of sensory dullness and severe zoster neuralgia. Postherpetic neuralgia caused by herpes zoster viral vasculitis and neuritis can persist for more than 2 months after the initial herpes zoster skin lesion. postherpetic neuralgia occurs in approximately 50% of patients over 60 years of age. Sclerositis has been reported in 0.68% to 8% of herpes zoster viral eye diseases. Sclerositis can occur in the acute phase (10 to 15 days after the lesions begin), mostly months or years after herpes zoster virus ophthalmopathy, and is often associated with ocular surgery. Herpes virus sclerositis is mostly diffuse or nodular anterior sclerositis and can also progress to necrotizing anterior sclerositis. Self-perceived symptoms include eye redness, eye pain, conjunctival sac discharge, and vision loss. The intensity of ocular pain is parallel to the degree of inflammation, intensifies at night, and may radiate to the brow arch and periorbital area. Conjunctival bursal discharge is mucous, and photophobia and lacrimation are present in the presence of combined keratitis. Signs: Diffuse anterior sclerenitis has few and mild systemic comorbidities, mainly manifesting as diffuse congestion and swelling of superficial scleral tissues with high conjunctival edema, making it difficult to see the deeper vessels of scleral tissues and scleral tissues, requiring 1:1000 epinephrine drops in the conjunctival sac to make the superficial congestion disappear before it can be seen. Nodular anterior sclerositis forms persistent encapsulated nodules that are purple-red in color and painful and refuse to be pressed. The nodules are solitary or multiple, centrally transparent, and completely immobile. The nodules are clearly demarcated from the superficial tissue. The conjunctiva and superficial blood vessels of the sclera are raised by the nodules. The anterior sclera is dark purple in color. If the lesion continues to progress, it may lead to necrotizing anterior sclerositis, and the sclera in front of the equator may show yellowish gray spots, and in severe cases, the sclera may have one or more localized carrion necrosis. If the tissue is detached, it eventually leads to scleral perforation and formation of chylomicron. The sclera takes several months to repair, leaving permanent scleral thinning and scarring. Recurrences are frequent, occurring at different sites of the initial sclerosion and even lasting for years. Herpes zoster virus sclerositis with stromal keratitis, either immune discoid keratitis or white necrotic stromal keratitis, can progress to keratosclerosis or even marginal ulcerative keratitis. It can also be accompanied by anterior uveitis, forming fan-shaped iris atrophy and/or trabeculitis, which can further develop into secondary glaucoma. Decreased corneal sensation and fan iris atrophy at the site of injury can help in the diagnosis of herpes zoster virus sclerositis. Outer scleral inflammation may precede the rash and is often associated with conjunctival and superficial scleral vesicles or corneal dendritic changes. Outer scleral inflammation is either simple or nodular, with all lesions located in the superficial sclera. In the former case, superficial scleral congestion is seen, with radially dilated and tortuous blood vessels and a flaming red color, and the lesions are often limited in extent. In the latter case, the lesions are located in the superficial sclera and are surrounded by congestion and can move. The nodules are mostly solitary, 1 to 2 mm in size. The deeper sclera of the nodule is clearly visible and the vascular plexus remains normal. Scleral outer layer inflammation is caused by direct viral invasion and lasts 3 to 4 weeks without sequelae. Immune-mediated outer scleral inflammation appears within 10 to 15 days after the lesion. The diagnosis is not difficult based on the history and characteristic clinical presentation. HZS should be highly suspected in patients with sclerositis and previous herpes zoster ophthalmicus, especially with hyperalgesia and iris atrophy.