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.
Before glass, homes must either have been very dark but warm, or light but cold. Smashing Stuff. Glass is sand thatâs been heated to a very high temperature. Obsidian is a natural glass, made by volcanic eruptions millions of years ago. Lightning strikes on sand also produce natural glass, called fulgarites.