A smoking habit damages every organ and system in the body, including the eyes. We typically think of lung cancer as the main health risk associated with smoking, and then maybe oral health problems next, but the parts of the body that have direct...
Human eye color comes from melanin, the same compound that determines skin and hair color. Melanin absorbs light, even some UV light, which is important for the iris — the part of the eye that controls how much light enters the pupil. Melanin...
Since as early as 60 A.D., people have been using vision-correcting tools to help them see. Around that time, the Roman philosopher Seneca used a glass globe of water to magnify text, while Emperor Nero needed a magnifying emerald to see gladiator...