Which of the following describes ocular exposure?

• A. Substances enter through the eyes or surrounding mucous membranes; effects vary; may cause systemic poisoning; may also be classified as cutaneous
• B. Substance enters through the skin; low severity
• C. Substances enter through the lungs; immediate pulmonary injury
• D. Substance is not absorbed and has no effect

Answer: (A)

Ocular exposure means a substance enters through the eyes or surrounding mucous membranes. The eye’s conjunctiva is thin and highly vascular, so many chemicals can be absorbed quickly, causing local effects like irritation, tearing, redness, or chemical burns, and, in some cases, damage to the cornea. There’s also potential for systemic poisoning if the substance reaches the bloodstream via ocular tissues or drains through the nasolacrimal system to the nasal passages and beyond. This route is distinct from exposure through the skin or through the lungs, and it’s not accurate to say there’s no effect or no absorption—effects can vary widely and can be serious. In some contexts, ocular exposure may be discussed alongside cutaneous exposure because mucous membranes share absorption characteristics with skin. This is why eye protection is essential and why oral or nasal drainage paths can contribute to broader exposure concerns.