Which tissue is most at risk from laser exposure?

• A. The eyes and skin
• B. The heart
• C. The liver
• D. The kidneys

Answer: (A)

Energy from a laser interacts with tissue in ways that depend on wavelength, exposure duration, and how the beam is focused. The eyes and skin are the most vulnerable because they are the tissues most directly exposed to where the beam concentrates and deposits energy.

The eyes are especially at risk because the optical system focuses light onto a tiny area of the retina. This concentration can cause rapid, permanent retinal damage even from very short exposures, and often there are few or no early warning signs because the retina has limited pain receptors. The cornea and lens can also be damaged, but the retina’s sensitivity to the focused energy makes the eye the primary concern.

The skin is also at risk because it acts as the body’s outer barrier and readily absorbs laser energy, converting it to heat. This can produce burns or erythema, with injury depending on the laser’s wavelength, power, and how long the skin is exposed.

Organs like the heart, liver, or kidneys aren’t typically directly affected by laser energy in ordinary occupational settings, since they aren’t the tissues that the beam targets or concentrates on during normal use.