0
Fredrick Douglass
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
Who invented the lenses?
who invented the bifocal lenses
What is the best way to clean spectacle lenses?
The best way to clean spectacle lenses is to use a specialized lens cleaner and a lint-free cloth. Spray the cleaner on the outside and inside of the lenses and gently rub dry with the cloth. Lens cleaners are available at most opticians, but be sure to check that they are suitable for your lens type. If you don't have any lens cleaner, use clean tap water and rub the lenses with your fingers. Dry with a soft tissue of lint-free cloth. Warning:Never use any kind of soap or detergent on anti-reflective coated lenses. The coatings will break down, and this will damage the lenses beyond repair.
Who is the inventor of contact lenses?
Leonardo Da Vinci in the early 1500's invented contact lenses.
How was the compound microscope invented?
Zacharias Janssen and his son Johannes (Hans), spectacle makers in Holland, are usually credited with inventing the first compound microscope in about 1590. (Hans Lippershey, a spectacle maker in the same city, Middelburg, Netherlands, also claimed credit for the invention but was perhaps more instrumental in the creation of the telescope.) It was said that the Zacharias Janssen was experimenting with ways to improve spectacles for people who needed greater magnification to improve eyesight, but nothing more specific than simply experimenting with multiple lenses can be associated with how he invented the compound microscope. It is worth noting that at the same time experimentation by other spectacle makers and lens makers was leading to the discovery of the telescope, another optical instrument of two lenses. Two decades later, Galileo Galilei built a compound microscope and changed the lens design lens (convex and concave lens).
What are sunglasses made of?
The lenses are made from either glass or plastic. The frames are generally made from plastic, nylon, a metal or metal alloy.
When were the plastic spectacle Glasses lenses invented?
= plastic spectacle Glasses lenses invented 1934 =
Who invented plastic lenses?
Fredrick Douglass
What happens if you splash petrol on spectacle lenses?
The lenses get petrol on them.
Is spectacles made of glass?
Not all... Some spectacle-makers use plastic lenses instead of glass.
What is lenticular spectacle lenses are they better than trifocals?
Varifocals
Who invented the lenses?
who invented the bifocal lenses
What are some examples of surface defects in spectacle lenses?
* Cracks * Scratches * Peeling (if there is a coating on the lens)
What was the product share of plastic ophthalmic focus lenses?
Plastic ophthalmic focus lenses accounted for approximately 18.3 percent of the industry's shipments
What are other lenses than glasses?
Plastic
What are eyeglass lenses made of?
According to Wikipedia, today's lenses are typically made from plastic, such as polycarbonate. Plastic is used in order to lessen the chance of breakage.
Who invented the telescope lenses?
Lenses had been known for some time before the telescope was invented. No one really specifically "invented" the telescope lens, they simply used existing equipment (lenses) in a new device (the telescope).
When where contact lenses invented?
It was invented in the early 1500's..
