Improper distance control while administering OC can cause this 'effect' which damages the eyes

Improper distance control while administering OC can cause this 'effect' which damages the eyes

• A. Thermal burn
• B. Chemical burn
• C. Vapour effect
• D. Hydraulic needle effect

Answer: (D)

When OC spray is used too close, the liquid can form a concentrated, high-velocity jet rather than a fine mist. This near-field jet carries enough momentum to strike the eye like a tiny needle, causing mechanical injury to the ocular surface such as corneal abrasions or irritation. This hydraulic needle effect is about physical damage from the liquid jet itself, not heat or chemical damage from the spray’s components. Thermal burns would require heat, and vapour effects pertain to inhalation or exposure away from the eye; chemical burns would come from contact with the chemical, but the described damage at close range is the result of the focused jet—hence the hydraulic needle effect.

When OC spray is used too close, the liquid can form a concentrated, high-velocity jet rather than a fine mist. This near-field jet carries enough momentum to strike the eye like a tiny needle, causing mechanical injury to the ocular surface such as corneal abrasions or irritation. This hydraulic needle effect is about physical damage from the liquid jet itself, not heat or chemical damage from the spray’s components. Thermal burns would require heat, and vapour effects pertain to inhalation or exposure away from the eye; chemical burns would come from contact with the chemical, but the described damage at close range is the result of the focused jet—hence the hydraulic needle effect.