There are all kinds of eyeglass lenses, including light-sensitive photochromic ones that darken in sunlight and double-up as sunglasses. You'll also find lenses in binoculars (which use two or three lenses in each of the cylinders serving your eyes) and telescopes, though not all microscopes...
The first type of telescope ever designed was a refractor, designed by an eyeglass maker in the Netherlands in 1608. Soon after,Galileoimproved on this refracting telescope design and applied its uses to astronomy. The three main types of telescopes arerefracting telescopes,reflecting telescopes, a...
There are many different types of eyeglass lenses, including bifocals, trifocals, progressive lenses, and multifocals. Eyeglass...