Unit 1: History Flashcards
1200s
-A bean-shaped lens, referred you as a flat lens, Delivered good central vision
-Reading crystals are Laid on reading material and used as magnifying glass
1000 AD
Wearable spectacles are created. Called roidi da ogli (round glass for the eyes)
1284
A reading stone is created
1300s
By concave lenses created to correct nearsightedness
1500s
-Materials such as whalebone, tortoise shell, bone and leather are used for frames
-Deca de Valdes Creates first scientific table. Organizing different lenses according to corrective power
1400s
Lenses are joined together and held in front of the eyes for reading
1600s
The first temples that arrested on the ear were created
1623
Frames became a type of jewelry. Gold, silver and other precious metals are used to create frames.
1700s
-The first guild was created to control the trade of eyeglasses
-Lenses are joined together with a spring type bridge so you don’t have to hold them up
1728
Edward Scarlet creates the first eyeglasses with temples
1730
The first bifocal lenses are created
1752
Aspheric lenses are brought to main stream to further improve peripheral vision
1873
Para scopic lenses are created. They improve the peripheral vision by using -1.25 back surface
1800s
Single vision lenses converted from plus cylinder form to Minas. This moved the toric surface to the back of the lens
1890s
Six bass meniscus lenses further improve peripheral vision
