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Sacred Geometry - Crystalinks Sacred geometry is geometry that is sacred to the observer or discoverer. The term "sacred geometry" is used by archaeologists, anthropologists, and geometricians to encompass the religious, philosophical, and spiritual beliefs that have sprung up around geometry in various cultures during the course of human history. Charles Gilchrist: Sacred Geometry and the Architecture of the Universe www.crystalinks.com /sacred_geometry.html   (646 words)

Encyclopedia :: encyclopedia : Geometry   (Site not responding. Last check: 2007-10-26) The earliest recorded beginnings of geometry may be traced to Ancient Egypt (see geometry in Egypt) and Ancient Babylon (see Babylonian mathematics) around 3000 B.C. Early geometry was a collection of empirically discovered principles concerning lengths, angles, areas, and volumes, which were developed to meet some practical need in surveying, construction, astronomy, and various crafts. The first and most important was the creation of analytic geometry, or geometry with coordinates and equations, by Rene Descartes (1596-1650) and Pierre de Fermat (1601-1665). In geometry, there was a clear need for a new set of axioms, which would be complete, and which in no way relied on pictures we draw or on our intuition of space. www.hallencyclopedia.com /topic/Geometry.html   (2103 words)

Molecular Expressions Microscopy Primer: Physics of Light and Color - Lenses and Geometrical Optics Each lens has two principal planes and two focal planes that are defined by the geometry of the lens and the relationship between the lens and the focused image. The object (or specimen) being imaged by the lens is positioned in the object plane, located on the left-hand side of the lens by convention, and is represented by a red arrow that travels upward from the centerline or optical axis, which passes through the center of the lens, perpendicular to the principal planes. Each lens has a different focal length (f(a) for the lens nearest the point source in Figure 4 and f(b) for the second lens), and the spherical wave that emerges from the second lens (lens (b)) is centered at a focal point that is also removed from optical axis of the lens system. www.microscopy.fsu.edu /primer/lightandcolor/lensesintro.html   (4333 words)

Lens - Camerapedia.org A lens (here: photographic lens, also known as objective lens or photographic objective) is an optical device through which light is focused in order to form an image inside of a camera either on film or on a digital sensor. The focal length of a lens is the distance on the optical axis from the focal plane to the optical center of the lens when it's focused to infinity. Lens coating thicknesses are typically measured in units of wavelengths of light, in nanometers (nm). www.camerapedia.org /wiki/Lenses   (3196 words)

Nikon MicroscopyU: Perfect Lens Characteristics - Interactive Java Tutorial The distance between the lens and the focal point is referred to as the focal length of the lens (denoted by the distance f in Figure 1). The general action of a perfect lens (or lens system) is to convert one spherical wave into another, with the geometrical properties of the lens determining the position of the focal point. As the distance of the light source from the lens is increased, the angle of diverging light rays entering the lens is decreased with a corresponding increase in the radius of the wavefront. www.microscopyu.com /tutorials/java/components/perfectlens   (898 words)

Okino's Lens Flare Plug-In System Lens flares and glows are associated with either a point or spot light source, or with a geometry item. Normally a real-life camera lens (often made up of half a dozen or more lens optical parts) is optimized to pass light through its lens components, but some light will reflect off the lens surfaces instead of passing through them (even with the special anti-reflective coatings on each optical glass part). If the lens effect is associated with a light source (and not a geometry item) then enabling this checkbox will cause the final computed lens effect to be tainted with the color of its associated light source and of the intensity of the associated light source. www.okino.com /conv/features/lensflare/lensflare.htm   (6674 words)

Remcom - Electromagnetic Simulation Software - - Spherical Lens Geometry The focused fields from the lens are shown for two cases: the first with the lines perpendicular to the incoming wave and the second with the lens tilted by 45 degrees. The first case with the lens perpendicular to the incident field was simulated using a problem space of 225x225x445 FDTD cells at a cellular resolution of 2.5 mm. The second case, with the lens tilted by 45 degrees to the incident field, was simulated in a problem space of 251x233x451 FDTD cells at 2.5 mm per cell. www.remcom.com /xfdtd/examples/spherical-lens-geometry.html   (455 words)

Iconic Products Blending the lens geometries of Oakley’s new "XYZ Optics®" with the art of authentic styling, Eye Jacket® brought a timeless design to the realm of sport performance. A lens that curves around the eyes causes light to bend, which leads to visual distortion. Radar™ was engineered with Hydrophobic lens technology that repels water and sweat while making the lens surface immune to oils and contaminates that corrupt vision. www.oakley.com /innovation/design/iconicproducts   (1772 words)

Contact Lens Spectrum Consider using reverse geometry GP lenses in managing refractive surgery undercorrections in cases of inability to perform enhancements due to inadequate corneal thickness, or cases of small degrees of undercorrection where the risks of enhancement procedures may outweigh the benefits. Calculating lens parameters used for the treatment of refractive surgery undercorrections is a challenge and does not fit into the nomograms currently available for reverse geometry lens fitting. Ultimate determination of lens parameters are made with the evaluation of lenses on the eye in terms of positioning, corneal alignment (fluorescein patterns), lens movement and ultimately clinical performance of reduction of refractive error. www.clspectrum.com /article.aspx?article=12262   (1433 words)

#1 Site To Learn About Light Conventionally the focal length of concave lens is taken as negative and that of a convex lens is taken as positive. Power of a lens is given as the inverse of its focal length measured in meters. The standard unit for measuring P is dioptre and is denoted by D. Dioptre = 1, means a lens whose focal length is 1 meter. home.att.net /~cat4a/light-XIV.htm   (512 words)

contact lenses The Reverse Geometry OK® Contact Lens for Orthokeratology rigid gas-permeable contact lens, made by ConTEX, Sherman Oaks, Calif., is the first contact lens designed to correct nearsightedness by temporarily reshaping the transparent tissue known as the cornea that covers the iris and pupil. Under the binding down of a rigid contact lens during sleep, the flow of tears and oxygen to the cornea is further reduced. The use of homemade saline from salt tablets is one of the biggest contributors to Acanthamoeba keratitis in contact lens wearers. www.caridon.com /contact-lenses.html   (742 words)

TeacherSource . Math . Movies--Geometry of Lenses | PBS The lens bends light rays so that all the light from one point on an object in a scene comes together at a corresponding point on the film. For this to happen, the distance between the lens and the object and the distance between the lens and the film must be just right. How much of a scene the lens can see is determined by the triangle on the right, where the distance is the focal length and the base of the triangle is the usable width of the film. www.pbs.org /teachersource/mathline/concepts/movies/activity3.shtm   (1097 words)

Lens calibration It is possible to measure the distortions of a lens quite accurately with various methods - a slide with a grid marked on it can, for example, be placed in the film aperture, a light shone through it and the projected image measured. A fisheye lens (the usual equidistant type say) will produce what appear to be distorted images to the casual observer but these distortions are mostly inherent to the basic geometry of this lens type. Lens calibration and rectification is often done for photographic applications where measurements need to be made from images - forensic scenes, aerial photography for mapping, forestry tree cover surveys etc - and image rectification also has some potential everday photographic uses eg. www.culture.com.au /virtual/tutorials/calib.htm   (1981 words)

USC Sequence Stratigraphy Web Carbonate bodies with lens-like geometries include biohermal or reef buildups that form during and after rapid relative sea level rises as well as down-slope debris fans. In contrast the sheet-like geometries may include muddy or grain-dominated progradational carbonate sheets that are terminated by exposure or flooding or prolonged stillstands. Finally, plays with ribbon geometry are formed by carbonates that accumulate at the platform margin. strata.geol.sc.edu /thinsections/plays.html   (748 words)

Comparison Test - Lynx Roadstuds and Roadsafety Products If measured under measuring geometry I their before washing CIL values were 12 times higher, their after washing CIL values even 75 times higher than those of the markers with plastic reflectors. Measuring was based on a measuring geometry of an entrance angle of 20° and an observation angle of 0,5°. In the laboratory the coefficients of luminous intensity were measured in a new state, after 1 1/4 years and 2 1/2 years of use. www.lynxroadstuds.co.za /test_reflector.htm   (1671 words)

Method of manufacturing a contact lens patent invention In particular, the present invention is related to a method for converting a desired lens design to a geometry of a contact lens to be produced in a manufacturing system. Exemplary non-optical systems of a contact lens include, but are not limited to bevel, lenticular, and edge that joins the anterior and posterior surfaces of a contact lens. Exemplary non-optical zones and features of a contact lens include, but are not limited to bevel, lenticular, edge that joins the anterior and posterior surfaces of a contact lens, orientation features, and the like. www.freshpatents.com /Method-of-manufacturing-a-contact-lens-dt20060316ptan20060055876.php   (1763 words)

Rose K Lens - Keratoconus Contact Lenses The Rose K Lens has been described in a study by Dr Patrick Caroline, Director of Contacts Lens Research at the Oregon Health Services University, Portland, USA, as "a quantum leap forward in the evolution of lens design for the condition" of keratoconus. The Rose K™ lenses complex geometry has only become possible since computer controlled contact lens lathes were developed to cut gas permeable plastic to precisely the right shape. It is little wonder then that the world's most frequently prescribed contact lens for keratoconus is the Rose K Lens. www.roseklens.com /_rose_k_lens.htm   (228 words)

Overhead projector fresnel lenses application magnifying lens Hengwen optics in China A positive lens is a Fresnel lens with a positive focal length. Lens application refers to the desired wavelength range for the lens. Important lens geometry parameters to consider when specifying Fresnel lenses include effective focal length, grooves, round or square construction, and dimensions. www.fresneloptic.com /html_en/application.htm   (605 words)

KERATOCONUS ROSE K lens- The World's Most Prescribed Lens for Keratoconus Heralded as "a quantum leap forward in the evolution of lens design for the condition" of keratoconus the Rose K™ lens has become the world's most frequently prescribed rigid gas permeable contact lens for keratoconus. Unlike traditional contact lenses, the complex geometry built into every Rose K™ contact lens closely mimics the cone like shape of the cornea, for every stage of the condition. The Rose K™ lenses complex geometry has only become possible since computer controlled contact lens lathes were developed to cut plastic to precisely the right shape. www.roseklens.com /roseklens/roseklens_default.asp   (300 words)

Contex OK Lens Lens is an innovative method that uses customized lenses to gently correct your vision while you sleep, More... Lens, the first contact lens designed for orthokeratology. The Contex name is one of the best-known and most respected contact lens brands in the world. www.oklens.com /aboutus.html   (104 words)

Moving trains The person in the centre is 3 nanoseconds in the future of the two on the outside because the light captured by the camera had to travel an extra metre. It is clear that the ability of the camera to capture images of objects at the same moment in time is affected by the geometry of the scene and by the position of the camera. The optics of the camera and the geometry of the light rays is exactly the same even if the personal qualities of steam engines and people are different. users.powernet.co.uk /bearsoft/Simlt.html   (3900 words)

Review of Optometry August 1999 CORNEA & CONTACT LENS Q&A The type of lens you fit depends on how much irregularity there is, how flat the cornea is and the extent of the surgery. One precaution: The lens must move adequately on the eye, and you should suggest that the patient reduce his wearing time because of low oxygen permeability. Reverse geometry lenses, such as the Plateau lens, have a relatively flat center and a steeper mid-periphery. www.revoptom.com /archive/issue/ro08clqa.htm   (641 words)

Odin: Cartesian Oval Lens Geometry A lens with a surface of revolution based on a Cartesian Oval will transform a beam of some phase radius into a beam of another, finite, phase radius. The second surface of the lens is spherical and matches the phase radius of the beam at that distance. Knowing the quasioptical parameters of the beam, and the mechanical constraints, it is then a simple matter to generate a mechanical drawing for manufacture of the lens. www.iras.ucalgary.ca /~sat/Odin/qo/cartov.html   (154 words)

ZBIG VISION::CONCEPTS A major obstacle is the lack of an accepted standard for the generation of visual elements which incorporate movement, time, geometry and scale. With every degree of "zoom out" or with every "shorter" focal length of a lens, objects which are very close to the observer are "pushed" away towards the horizon. The Spherical Lens which will be integrated into the "One Box" system can be used separately in all traditional photo-film or video cameras. www.zbigvision.com /conceptonebox.html   (1226 words)

Convex Lens Real Images - The Geometry We consider the thickness of the lens to be small compared to the distances involved. We think for simplification that the light rays do all of their bending in the center of the lens rather than the two sides. In practice, the lens will form a set of parallel light rays that will neither converge or diverge, so no image is ever formed. homepage.mac.com /cbakken/obookshelf/cvreal2.html   (572 words)

Cameras Underwater: Lens radial correction using Panorama Tools. Thus the user is stuck with the lens provided by the manufacturer; and while such lenses proudly bear the names of many great optical companies, the actual performance is apt to induce nausea in former SLR owners. Likewise the geometries of the separated R G and B images are not affected by aperture, which is why you can't improve the chromatic performance of a lens and port by stopping down. In this case however, the lens entrance pupil ends up slightly behind the centre of curvature of the dome, and so the in air coverage of the lens (77°) is not exactly conserved. www.camerasunderwater.info /optics/lenscorrect.html   (6277 words)

The Dispatch - Serving the Lexington, NC - News   (Site not responding. Last check: 2007-10-26) Lens (genus), the genus of the lentil plant Lens (geometry), a geometric shape formed from two arcs Lens (geology), a body of ore or rock that is thick in the middle and thin at the edges www.the-dispatch.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=lens   (116 words)

Oakley sunglasses page 8 from Jetsetters Magazine at www.jetsettersmagazine.com Condensed cranial geometry produces eyewear for smaller faces-because wind, UV and projectiles don t sidestep the challenge of tighter targets. Oakley took the formulas for lens rake and XYZ Optics®, trimmed the dimensions and honed the aesthetics. Condensed cranial geometry produces eyewear for smaller faces-because wind, UV and projectiles don't sidestep the challenge of tighter targets. www.jetsettersmagazine.com /archive/jetezine/gear/shades/oakley/oakley8.html   (819 words)

K3's Astronomy - Barlow lens & Focal reducer Barlow lens is used for extending focal length of telescope objective. Focal reducer is used for reducing focal length of telescope objective. Computer generated images, real images, drawings and texts are property of the author and may not be reproduced or used without permission of author. www.pk3.org /Astro/scopes_barlow_focal_reducer.htm   (303 words)

Kaenon Polarized - Tech - Frame Geometry Kaenon Polarized frame geometry utilizes CAD/CAM digital technology, innovative new materials, and a unique "function first" focus. In addition, each Kore lens shape is ergonomically designed to provide optimum visual performance and maximum protection from the elements - no matter what your particular head shape or size. We used the performance-driven geometry built into Kore as a template for each of our frames. www.kaenon.com /tech.cfm   (130 words)

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