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Corrective lens print that page


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. Intraocular lenses

Lens (optics) print that page


A lens is an optical device with perfect or approximate axial symmetry which transmits and refracts light , converging or diverging the beam . [ citation needed ] A simple lens consists of a single optical element. A compound lens is an array of simple lenses (elements) with a common

Glossary of diabetes print that page

The following is a glossary of diabetes which explains terms connected with diabetes. Contents: Top   · 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z B Background retinopathy – Also known as non-proliferative retinopathy Basal rate – Refers | 2011/6/30 16:07:06

Animal testing print that page


The research is conducted inside universities, medical schools, pharmaceutical companies, farms, defense establishments, and commercial facilities that provide animal-testing services to industry. [ 5 ] It includes pure research such as genetics , developmental biology , behavioral studies

Scuba diving print that page


Unlike early diving, which relied exclusively on air pumped from the surface , scuba divers carry their own source of breathing gas (usually compressed air ), [ 3 ] allowing them greater freedom than with an air line . Both surface supplied and scuba diving allow divers to stay underwater

Contact lens print that page


A contact lens (also known simply as contacts for a pair) is a corrective , cosmetic , or therapeutic lens usually placed on the cornea of the eye . Leonardo da Vinci is credited with describing and sketching the first ideas for contact lenses in 1508, but it was more than 300 years later

Lenticular lens print that page


move as the image is viewed from different angles. Contents 1 Lenticular printing 2 Corrective lenses 3 Lenticular screens 4 3D television 5 Lenticular color motion picture processes 6 Angle of view of a lenticular print 6.1 Angle within the lens 6.1.1 Definitions

Progressive lens print that page


The first patent for a PAL was British Patent 15,735, granted to Own Aves with a 1907 priority date. [ 1 ] Aves' patent included the progressive lens design and the manufacturing process. However this was unlike modern PALs. It consisted of a conical back surface and a cylindrical front with

Eyeglass prescription print that page


specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an examination indicates that corrective lenses are appropriate, the prescriber generally provides the patient with an eyewear prescription

Optics print that page


Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric