Glasses were invented in 1284. Salvino D'Armate invented it in Italy.
The improvement of glasses starts.
Nicolaus Cusanuso discovered that near-sightedness could be corrected with the concave lens.
Benjamin Franklin improved it in 1784.
George Biddell Airy improved it in 1825.
Francisco de Xavier told Japan about glasses.
There are various kinds of lenses.
Plastic lens,glass lens,High refraction lens.
There are a lot of frames, too.
Glasses are useful for people's lives.
