Which of the following is a sensitive area that should never be used for electrotherapy?

• A. Forearm
• B. Ankle
• C. Eyes
• D. Calf

Answer: (C)

The main idea here is safety: certain body areas are especially vulnerable to electrical stimulation, so they must not be used. The eyes are a highly sensitive region with delicate tissues and important neural structures. Electrical current near the eyes can cause tissue injury to the cornea, lens, retina, or optic nerve, and can lead to vision problems or lasting damage. Additionally, stimulation around the eyes can provoke reflexive eye movements or blinking that interfere with treatment and safety. Because of these risks, the eyes should never be used for electrotherapy.

Other sites like the forearm, ankle, or calf are commonly used in practice when appropriate for the modality and parameters, so they are appropriate choices under proper precautions.