Unilateral orbital fat change

A man in his 60s suffering from open-angle glaucoma attended a routine glaucoma follow-up complaining that his left eye has changed in appearance. On examination, there was extensive loss of orbital fat giving the appearance of a sunken in globe. A diagnosis of prostaglandin-associated periorbitopathy was made as the man had been taking a prostaglandin analogue for his glaucoma for over 4 years in his left eye only.

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