Search results
Results from the WOW.Com Content Network
In borosilicate glasses rich in boron, sulfur imparts a blue color. With calcium it yields a deep yellow color. [4] Manganese can be added in small amounts to remove the green tint given by iron, or in higher concentrations to give glass an amethyst color. Manganese is one of the oldest glass additives, and purple manganese glass was used since ...
Modern glasses are typically supported by pads on the bridge of the nose and by temple arms placed over the ears. Historical types include the pince-nez, monocle, lorgnette, and scissors-glasses. Eyeglass lenses are commonly made from plastic, including CR-39 and polycarbonate. These materials reduce the danger of breakage and weigh less than ...
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.
EnChroma are a brand of color corrective lenses designed to address the symptoms of red–green color blindness.Studies have shown that these lenses can alter the appearance of colors, but they do not restore normal color vision, [1] and generally agree that they do not allow the wearer to see "new" colors. [2]
For premium support please call: 800-290-4726 more ways to reach us
In the first half of the 1980s, glasses with large, plastic frames were in fashion for both men and women. Small metal framed glasses made a return to fashion in 1984 and 1985, and in the late 1980s, glasses with tortoise-shell coloring became popular. These were smaller and rounder than the type that was popular earlier in the decade.
Bulky and breakable reading glasses are a hassle and a pain to remember. Instead, try these lightweight, indestructible reading glasses that come equipped with a keychain carrying case.
It is genetic, like hair or eye color. Dense breast tissue not only makes mammograms more difficult to read, but it is also a risk factor for breast cancer. Women with dense breasts have a higher ...