Which material would be the most problematic in an ocular foreign body?

• A. Glass
• B. Stone
• C. Copper
• D. Plastic

Answer: (C)

When evaluating ocular foreign bodies, the danger isn’t just the physical impact but what the material can release or do to eye tissues over time. Copper is particularly problematic because it readily releases copper ions when it’s in the eye. These ions cause a toxic reaction in ocular tissues known as chalcosis, which can progressively damage the cornea, iris, lens, and retina and provoke chronic inflammation. This toxic potential means a retained copper fragment can lead to ongoing tissue injury and vision loss, often necessitating urgent removal.

In contrast, materials like glass, stone, and plastic are largely inert in the eye. They may cause mechanical irritation or a local inflammatory response if jagged or large, but they do not release toxic ions that cause progressive tissue damage. That inertness makes them far less risky in terms of chemical toxicity.

So the material with the highest potential for serious, ongoing harm to ocular tissues is copper, due to its propensity to cause chalcosis and associated tissue damage.