Which part of the body is most vulnerable to laser light?

The area most vulnerable to laser light is the eyes, specifically the cornea, retina, and lens. This sensitivity arises because the eyes are designed to focus light, which means they can concentrate the energy from a laser beam more than other tissues in the body. The cornea and lens are particularly susceptible to damage from intense light due to their transparent nature, which allows the laser light to penetrate without obstruction. The retina, being the most sensitive part of the eye that detects light and colors, can suffer from severe damage, including burns, if exposed to laser light, leading to potential vision loss.

In contrast, while the skin and muscle can also absorb some laser wavelengths, they generally have more tolerance and protective mechanisms against thermal injury compared to the eyes. Nails and hair do not possess significant sensitivity to laser light as they lack vital cellular structures that would be affected. Teeth and gums, although they can be impacted by certain dental lasers, are not as vulnerable as the eye due to their different biological composition and structure. The eyes remain the optimal choice due to their high sensitivity and the potential for severe injury with laser exposure.