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Cover one eye; read the letters aloud. Cover the other eye; read the letters aloud. Ah, the standard eye exam. A few lines of text and the doctor can tell you whether you have poor vision. But let ...
Lorch points out that eye exams are more than just checking to see if you need glasses — your doctor will look to see if you have signs of eye disease such as glaucoma, cataracts or macular ...
"If you don't need glasses before your 40s, chances are you will need to start using reading glasses in your 40s." Dr. See likes to tell people to picture the eyes as a camera for the body ...
Benjamin Franklin is generally credited with the invention of bifocals. He decided to saw his lenses in half so he could read the lips of speakers of French at court, the only way he could understand them. [1]
In 1909, Nathan Shigon of New York City invented [3] a monocular optometer with a range of +0.25 to +6.00 diopters, consisting of a mechanism where a disc of low-powered lenses advanced a second disc of higher power lenses automatically with each rotation, as in a modern phoropter.
The design of many modern opera glasses of the ornamental variety is based on the popular lorgnettes of the 19th century. Often, modern theatre binoculars are equipped with an LED flashlight, which makes it easier to find a place in the dark. In addition to the more stereotypical binocular type, folding opera glasses were another common design.
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