what is lenses
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- Lens (optics) For other uses, see Lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
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lens See more synonyms on Thesaurus.com. noun, plural lenses. 1. a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision.
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AP Psychology Sensation & Perception Lens. transparent part of the eye behind the iris; focuses light on the retina; change shape to focus on objects;-if object is closed, muscles attach to the land contract to make lens around,-if object is far away, the muscles pull to flatten the lens.
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Glasses For other uses, see Glass, Glass (disambiguation), and Spectacle (disambiguation). Glasses, also known as eyeglasses or spectacles, are devices consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically using a bridge over the nose and arms which rest over the ears.
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Lens (optics) Types of simple lenses. Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave).
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Corrective lens A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. Glasses or spectacles are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye.
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Lenticular lens A lenticular lens is an array of magnifying lenses, designed so that when viewed from slightly different angles, different images are magnified. lenticular lens is an array of magnifying lenses, designed so that when viewed from slightly different angles, different images are magnified.
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Eyeglasses And Eyeglass Lenses: Q&A A: Prism is usually prescribed in lenses to help you use your eyes together. Some people's eyes have a tendency to try and pull apart when they are in use — some go up and down, and some go in, and some go out. These are called muscle imbalances, or fixation disparities, in our lingo.
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What Are Contact Lenses? Contact lenses are medical devices worn directly on the cornea of the eye. Like eyeglasses, contact lenses help to correct refractive errors, providing a safe and effective way to correct vision when used with care and proper supervision. For certain conditions, contact lenses may be considered medically necessary.
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Lens (optics) Lens (optics) A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
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What are Progressive lenses? What are Progressive lenses? A progressive lens is an amazing piece of engineering, allowing multiple vision fields to be incorporated into a single lens without any clear distinction between the fields themselves. The power in the lenses progressively changes from far-to intermediate to your full reading power.
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lens Medical Definition of LENS. 1. : a curved piece of glass or plastic used singly or combined in eyeglasses or an optical instrument (as a microscope) for forming an image by focusing rays of light.2.: a device for directing or focusing radiation other than light (as sound waves, radio microwaves, or electrons).3.. : a curved piece of glass or plastic used singly or combined in eyeglasses or an optical instrument (as a microscope) for forming an image by focusing rays of light. 2.
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What does it feel like when a disc ruptures between the L4-L5? What does it feel like when a disc ruptures between the L4-L5? I have been diagnosed with a herniated disc between L4-L5. It is causing sciatica and I also have spinal stenosis. The last 4 days has been unbarable and I don't know what to do.
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- Converging lenses. A lens is transparent block that causes light to refract (changes the direction the light travels in). A converging lens (or convex lens) is curved on both sides. This means the light rays coming out of it come together at a point – they converge.
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Cataract A cataract means a cloudy or opacified lens. The lens is the middle window which separates the front (anterior) and back (posterior) segments of the eye. In a normal eye, it focuses any light entering the eye onto the retina.
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- Definition of Convex Lens. A lens which is thinner at the edges and thicker at the centre is known as convex lens. Generally lenses are made up of glass or transparent plastic and the same can be used for transmitting, refracting or for focusing the light.
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Which type of lens is used in cameras: concave or convex? The camera lens is an invention that attempts to duplicate the operation of the human eye. Just like the eye, the lens sees an image, focuses it, and transmits its colors, sharpness, and brightness through the camera to the photographic film, which, like our memory, records the image for processing and future use.Lenses are made of optical glass or plastic.he camera lens evolved from optical lenses developed for other purposes, and matured with the camera and photographic film. In 1568, a Venetian nobleman, Daniel Barbaro, placed a lens over the hole in a camera box and studied sharpness of image and focus. His first lens was from an old man's convex spectacles.
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focus focus. 1  a. The distinctness or clarity of an image rendered by an optical system. b. The state of maximum distinctness or clarity of such an image: in focus; out of focus. c. An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus. 2  a.
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Lens (optics) A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave).
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lens 3: a highly transparent biconvex lens-shaped or nearly spherical body in the eye that focuses light rays entering the eye typically onto the retina, lies immediately behind the pupil, is made up of slender curved rod-shaped ectodermal cells in concentric lamellae surrounded by a tenuous mesoblastic capsule, and alters its focal length by becoming more or less spherical in response to the action of the ciliary muscle on a peripheral suspensory ligament
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Lens (optics) A lens is a transmissive optical device that affects the focus of a light beam through refraction. A simple lens consists of a single piece of material, while a compound lens consists of several simple lenses (elements), usually along a common axis.hen the thickness of the lens is not much smaller than S 1 and S 2 or there are multiple lens elements (a compound lens), one must instead measure from the object and image to the principal planes of the lens.
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- A prism is a solid object that has the same cross section along the entire length of its shape. And prism in eyeglasses are used to help people for double vision, positional correction, or convergence correction. In fact, prism glasses can be very useful in dealing with eye misalignment.
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A Myriad of Lens Options Hi-index lenses are made of a special plastic material that refracts light in a different way than regular plastic lenses. With hi-index lenses, vision can be corrected with less material, making the lens much thinner. Plastics are graded in numbers, such as 1.50 or 1.67. The higher the number, the thinner the lens.
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About the Eye and How It Works It is the second part of your eye, after the cornea, that helps to focus light and images on your retina. Because the lens is flexible and elastic, it can change its curved shape to focus on objects and people that are either nearby or at a distance. The lens provides 25-35% of your eye's focusing power.
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lens 2. crystalline lens; the transparent, biconvex body separating the posterior chamber and the vitreous body of the eye. The crystalline lens refracts (bends) light rays so that they are focused on the retina.
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Sunglasses 1 2 After the appropriate additives have been blended in, the molten plastic or glass is then cast into the general lens shape, or puck.. 2  Inexpensive lenses are simple pucks that placed into frames. 3  Expensive lenses are prepared in a manner similar to the method by which prescription lenses are made.