Far infrared radiation may cause superficial burns to the cornea or skin. Which statement is true?

• A. Only to cornea
• B. False
• C. Only to skin
• D. True

Answer: (D)

Far infrared radiation carries heat energy, and exposure that is strong or prolonged can raise the temperature of surfaces it reaches. Both the eye (the cornea) and the skin are exposed surfaces, so thermal energy from FIR can cause superficial burns to either tissue when exposure is sufficient. The cornea is particularly susceptible because it is avascular and relies on limited cooling, so intense infrared heat can injure its surface and cause irritation or burns. The skin, being a large, exposed surface, can also burn from radiant heat when the exposure is high enough. Therefore, the statement that far infrared radiation may cause superficial burns to the cornea or skin is true. In practice, control exposure with shielding, distance, and appropriate eye and skin protection to prevent such injuries.