Optics is the scientific study of sight and the behavior of light, or the properties of transmission and deflection of other forms of radiation. Fashion optics is in regard to stylish eyewear. Eyewear means things worn on the eyes, such as spectacles and contact lenses.
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A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. Most lenses are spherical lenses: their two surfaces are parts of the surfaces of spheres. Each surface can be convex (bulging outwards from the lens), concave (depressed into the lens), or planar (flat). The line joining the centers of the spheres making up the lens surfaces is called the axis of the lens. Typically the lens axis passes through the physical center of the lens, because of the way they are manufactured. Lenses may be cut or ground after manufacturing to give them a different shape or size. The lens axis may then not pass through the physical center of the lens. Lenses are used as prosthetics for the correction of visual impairments such as myopia, hypermetropia, presbyopia, and astigmatism. (corrective lens, contact lens, eyeglasses.) Most lenses used for other purposes have strict axial symmetry; eyeglass lenses are only approximately symmetric. They are usually shaped to fit in a roughly oval, not circular, frame; the optical centres are placed over the eyeballs; their curvature may not be axially symmetric to correct for astigmatism. Sunglasses' lenses are designed to attenuate light; sunglass lenses that also correct visual impairments can be custom made.
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