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A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím , who also invented the first gel used for their production.
A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
Contact lens wearers can also wear sunglasses, goggles, or other eye wear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. Additionally, there are conditions such as keratoconus and aniseikonia that are typically corrected better with contact lenses than with glasses. [8]
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.
The following plots show the difference in spherical power at a 0 mm vertex distance (at the eye) and a 12 mm vertex distance (standard eyeglasses distance). 0 mm is used as the reference starting power and is one-to-one. The second plot shows the difference between the 0 mm and 12 mm vertex distance powers.
In another study [10] in the Journal of Family Psychology in 1998, researchers Cook and Douglas measured the validity of the looking glass self and symbolic interaction in the context of familial relationships. The study analyzed the accuracy of a college student's and an adolescent's perceptions of how they are perceived by their parents ...
AFC champion vs. NFC champion, 6:30 p.m. ET, Fox. This article originally appeared on USA TODAY: 2025 NFL playoff schedule: Dates, times, TV info for wild card games. Show comments.
The term "optometry" comes from the Greek words ὄψις (opsis; "view") and μέτρον (metron; "something used to measure", "measure", "rule").The word entered the language when the instrument for measuring vision was called an optometer, (before the terms phoropter or refractor were used).
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