Which sign is indicative of nasociliary involvement in Herpes Zoster Ophthalmicus?

Hutchinson's sign is indicative of nasociliary involvement in Herpes Zoster Ophthalmicus because it occurs when the herpes zoster virus affects the ophthalmic branch of the trigeminal nerve, particularly the nasociliary nerve. This sign is characterized by the presence of herpes lesions on the tip of the nose. The involvement of the nasociliary nerve suggests a higher risk of ocular complications, including keratitis and uveitis, making it clinically significant.

Identifying Hutchinson's sign allows healthcare providers to recognize possible ocular involvement early and manage the condition more effectively, potentially preventing serious complications. In contrast, other signs like the cherry red spot, Shafers sign, or Marcus Gunn pupil do not specifically relate to nasociliary involvement in Herpes Zoster Ophthalmicus.