There are 17 conditions associated with discharge or mucus in eyes, drainage or pus and yellow eyes. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions.
Burning glass. A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning mirrors achieve a similar effect by using reflecting surfaces to focus the light.
Self cleaning glass, or easy clean glass, has a transparent coating which works in two ways to break down dirt and spread water evenly across the surface. The special coating, which is a applied online during the making of the float glass, is both photocatalyic (reacts with UV rays) and hydrophilic (water-loving).