Which agent is known to make eyes particularly vulnerable due to their mucosa?

The agent known to make eyes particularly vulnerable due to their mucosa is sulfur mustard. Sulfur mustard, also known as mustard gas, is a chemical warfare agent that causes severe irritation and injury to mucous membranes, including those of the eyes. When exposure occurs, it can result in symptoms such as redness, swelling, and blistering of the conjunctiva and cornea. The mucosa is highly sensitive, and the damaging effects of sulfur mustard are exacerbated in this area because it can lead to long-lasting ocular damage, including potential blindness.

In contrast, although mustard gas and sulfur mustard refer to similar chemical compounds, the distinction commonly lies in the terminology used in various contexts. Pepper spray, while also an irritant and capable of affecting the eyes, operates through a different mechanism and does not generally result in the same level of severe injury as sulfur mustard. Chlorine, while a respiratory irritant, is not primarily associated with eye injury in the same way that sulfur mustard is. Thus, sulfur mustard stands out as the agent which specifically targets the delicate mucosal tissues of the eyes, highlighting its profound impact in chemical agent discussions.