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Man with glasses. A woman with glasses. Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
As the stones were experimented with, it was slowly understood that shallower lenses magnified more effectively. Around 1286, possibly in Pisa, Italy, the first pair of eyeglasses was made, although it is unclear who the inventor was. [50] The earliest known working telescopes were the refracting telescopes that appeared in the Netherlands in
The next class of antihypertensives to be discovered were calcium channel blockers. The first member was verapamil, a derivative of papaverine that was initially thought to be a beta blocker and used for angina, but then turned out to have a different mode of action and was shown to lower blood pressure. [21]
High blood pressure is caused by the force of blood flow in the arteries being too high. The DASH diet includes heart-healthy foods that lower blood pressure. 21 foods that lower blood pressure ...
In 1913, Crookes lenses [17] were introduced, [18] made from glass containing cerium, which completely blocked ultraviolet light. [19] [20] In the early 1920s, the use of sunglasses started to become more widespread, especially among movie stars. Inexpensive mass-produced sunglasses made from celluloid were first produced by Sam Foster in 1929.
High blood pressure, also known as hypertension, is a common health issue, affecting nearly half of adults in the United States (48%).. When an individual is diagnosed with high blood pressure ...
The style also came about from a desire to make eyewear as inconspicuous as possible; [4] at the time, eyeglasses were not considered an acceptable fashion statement and carried connotations of one being elderly or a member of the clergy; historically, most eyeglass wearers needed them to correct presbyopia, and only clergymen tended to be ...
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