The skin of some of the men developed a coarse, rough appearance, as a result of the hardening of their hair follices. Other effects included dizziness, muscle soreness, reduced coordination, and ringing in their ears. But the creepiest change, which occurred in all of the men, was a whitening of their eyeballs as the blood vessels in their eyes shrank. Their eyes eventually appeared brilliantly, unnaturally white, as if made out of porcelain.