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Learn about the physiology and perception of vision in humans and other organisms, and the various methods of correcting vision problems with optics. Find out how the eye, the retina, the brain, and the visual system work together to produce clear and colorful images.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
Pince-nez are glasses supported by pinching the nose bridge, popular in the 19th and 20th centuries. Learn about their varieties, such as C-bridge, astig, Fits-U, and Oxford spectacles, and their cultural references.
Learn about the history, types and features of rimless eyeglasses, a style of eyewear with lenses mounted directly to the bridge or temples. Find out how rimless glasses became popular and iconic among celebrities, politicians and intellectuals.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.
Learn about different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eyecare professionals. Find out how to choose the right lens for your vision needs, whether it is single vision, bifocal, trifocal, progressive, or multifocal.