Which of the following is a clinical finding commonly associated with ivermectin toxicity?

• A. Acute blindness and dilated pupils
• B. Conjunctival redness only
• C. Intraocular hemorrhage
• D. Eyelid margin crusting

Answer: (A)

Ivermectin toxicity can disrupt nervous system and autonomic pathways, which can affect vision and pupil control. A key visual feature in this scenario is sudden vision loss accompanied by dilated pupils, reflecting impaired pupillary reflexes and potential optic or central involvement from the toxic effect. This contrasts with the other eye findings, which are local surface or traumatic issues not characteristic of a systemic medication toxicity: conjunctival redness alone is a mild surface sign, intraocular hemorrhage points to vascular or traumatic causes, and eyelid margin crusting suggests blepharitis or local lid disease. So the combination of acute vision loss with dilated pupils best fits a systemic toxic effect of ivermectin.