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In page Herpes zoster ophthalmicus:

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Treatment is generally with antiviral pills such as acyclovir. Steroid eye drops and drops to dilate the pupil may also be used. The herpes zoster vaccine is recommended for prevention in those over the age of 50.[2] HZO is the second most common manifestation of shingles, the first being involvement of skin of the thorax.[citation needed] Shingles affects up to one half million people in the United States per year, of which 10% to 25% is HZO.[1][3]