jan 1, 1250 - Magnifying Glass
Description:
Roger Bacon constructed the first magnifying glass. The magnifying power of chips of crystal had been known for centuries, but this was the first convex lens designed for scientific purposes. By about 1280, similar lenses would be used to correct farsightedness; now, they are crucial in surgery (nytimes).
Added to timeline:
Medical Timeline
Discoveries Through the Years
Date: