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Refraction in Medical News

X-rays for early Alzheimer's disease detection

...ugh the tissue, the x-rays scatter and refract, or bend, at different angles depending on the characteristics of the tissue. The subtle scattering and refraction are detected by what is called an analyzer crystal, which diffracts, or changes the intensity, of the x-rays by different amounts according to their s...

Frost & Sullivan Acknowledges Syntec Optics' Unwavering Focus on Innovation and Strategies to Improve Profitability

... rate of 16 percent, while accounting for 13 percent of the revenues of the total market in 2007. The company's recent innovation, the patented high refraction diamond turning (HRDT) technology, is ideal for optics applications that require high refraction, heat resistance, and near infrared (NIR) properties....

Getting light to bend backwards

...hat causes light to refract, or bend, in a manner nature never intended. refraction always bends light one way, as one can see in the illusion of a "bent" drin...ic) acts as a single lens that refracts light in the opposite direction. refraction is the reason that lenses have to be curved, a trait that limits image reso...

Novel semiconductor structure bends light 'wrong' way -- the right direction for many applications

... Far more than a neat optical illusion, negative refraction holds promise for the development of superior lens...t lenses made from materials that exhibit negative refraction could compensate for this aberration and enable fa... the Princeton metamaterial is capable of negative refraction of light in the mid-infrared region, which is used...

New Low-Risk Eye Surgery Option at AIIMS

...Jeewan Titiyal, Professor of Opthalmology at AIIMS, told PTI. The embedding of the rings has the effect of flattening the cornea and changing the refraction of light passing through it, he said. The new procedure is much better than the popular LASIK surgery as it does not interfere with the functioning of...

Women Get A Raw Deal In Treatment of Heart Disease

...ment the first time around. As compared to men, women "don't have a higher rate of heart attack, stroke or death, but they do have increased rates for refraction [treatment-resistant disease] and for unstable angina," said lead author Dr. Sonia Anand, an associate professor of medicine, McMaster University in H...

Lasik surgery effective in correcting vision

...immune disorders like rheumatoid arthritis, lupus, Sjogresis syndrome etc. Before the lasik procedure you have to undergo eye examination including refraction of your eyes, corneal topography, pachymetry and retinal evaluation, to make sure that you will be a suitable candidate for lasik. On the day of ...
Refraction in Medical Technology

Menicon Undertakes With the Novovision Clinic a Paediatric Myopia Control Clinical Trial

...ction. Measurements of axial length (using partial coherence interferometry, Zeiss IOLMaster), anterior chamber depth, corneal topography, cycloplegic refraction and visual acuity are being performed at 6-month intervals. To date, no subjects have withdrawn from the study, no adverse events were evident and no ...
Refraction in Medical Products

Velo Automated Refraction Systems

Description: Increase the profitability of your practice by seeing more patients per day. Utilizing the capabilities of the VELO system you can turn a 14-18 patients per day practice into a 20-24 patient per day practice. By streamlining automated test sequences, youll perform accurate refractions in less time....
Company:Burton Ophthalmic

Topcon Exam-3000 Refraction System

Description: Launch your practice into the future with the all-new EXAM-3000! Perform refractions with unparalleled precision and efficiency, dramatically increase your patient flow and practice productivity, while saving time and money. Todays demand for delegation and connectivity makes the Topcon EXAM-3000 t...
Company:Topcon America Corporation

BV-1000 automated subjective refraction system

Description: The new FDA-Approved BV-1000 is the worlds first patient-driven automated subjective refraction system. With the BV-1000, Topcon has introduced a new generation of refracting instruments. This innovative product combines an objective simultaneous binocular auto-refractor, auto-keratometer, automati...
Company:Topcon America Corporation

Concepta Refraction Unit

Description: The only ergonomic work station of its kind with an optional built-in keratograph and flat-screen. The Concepta is a modern workstation for the examination and refraction of patients....
Company:Oculus, Inc.

Auto Ref/Keratometer ARK-530A/510A

Description:... The combination of new measuring principle - Pupil Zone Imaging Method - and unique technology - SLD - offers high accuracy and reliability in refraction measurement. Reliable Keratometer The ARK-530A/510A provides ordinary measurement (3.3 mm) using a mire ring, and also peripheral measurement...
Company:NIDEK, Inc.

Auto Refractometer AR-330A/310A

Description:... The combination of new measuring principle - Pupil Zone Imaging Method - and unique technology - SLD - offers high accuracy and reliability in refraction measurement....
Company:NIDEK, Inc.

RC-5000 AutoRefractor-Keratometer

Description:...ination time and ease of use makes working with the RC-5000 both professional and quick. The advanced touch-screen display allows you to perform both refraction and keratometry automatically with one simple movement. Capture one eye on the display and the RC-5000 will do both eyes automatically. With the new...
Company:Tomey Corp.

AXIS II PR Post Refractive

Description:...post-refractive formulas. Additionally six standard IOL formulas are available. The six post-refractive formulas are: Double K/SRK-T, History Derived, refraction Derived, Shammas, Rosa, and Contact Lens Method. The other six standard formulas are: SRK T, Holladay, Hoffer Q, Haigis, SRK II and Binkhorst II. IOL...
Company:Quantel Medical, Inc.

ClearChart Digital Acuity System

Description:...nates the need for a PC or additional components. Featuring a 15-inch LCD flat-panel screen, the ClearChart's sleek design fits neatly into any refraction environment with the flexibility to mount the system with a standard wall bracket or an optional custom table stand....
Company:Reichert, Inc.

C-Apochromat 40x/1.2 W Corr and 63x/1.2 W Corr - water immersion objectives for supreme demands

Description:...8 mm) and temperatures (scales for 24C and 37C). The correction collar can also be used for compensating slight deviations of the specimen's index of refraction from that of water...
Company:Carl Zeiss MicroImaging, Inc.
Refraction in Medical Definition

Pathology

... Retinitis pigmentosa - Macular edema - Epiretinal membrane - Macular pucker Ocular muscles , binocular movement , accommodation and refraction Strabismus - Ophthalmoparesis - Progressive external ophthalmoplegia - Esotropia - Exotropia - Refractive error - Hyperopia - Myopia...
Refraction in Medical Dictionary

Refraction

Refraction is the change in direction of a wave due to a change in its speed. This is most commonly observed when a wave passes from one medium to another. Refraction of light is the most commonly observed example, but any... Refraction is the change in direction of a wave due to a change...

Refraction test

... refraction test . Contents of this page: Illustrations. Alternative Names. Definition ... The refraction test is an eye exam that measures a person's prescription for ... refraction test Information ... The ...
Refraction in Biological News

Healing wounds with lasers, vehicles that drive themselves, other cutting-edge optics

...-induced movement of a mirror's surface owing to thermal noise is accompanied by associated changes in other physical parameters, such as the index of refraction of the mirror. These correlated changes can be exploited to compensate, in a coordinated way, the deleterious effects of the mirror surface's motion. ...

When every photon counts

...Brain Research. Evolution solved the problem by using a physical property of heterochromatin: Because of its denser packing it has a higher optical refraction index than euchromatin. This has no effect when the heterochromatin lies in the periphery of the nucleus. However when it is lumped in the nuclear cor...

Scientists focus on 'dwarf eye'

...eyes do not adjust their focus through growth like human eyes do, so MFRP has a completely different function in mice and was not assumed to alter eye refraction in humans." The research team successfully mapped the MFRP gene mutation in humans and discovered that the protein was completely missing from na...
Refraction in Biological Technology

Breaking barriers with nanoscale lasers

... could be made for optical communications. In an optically denser medium such as a semiconductor, this limit is reduced by a factor of the index of refraction (expressed mathematically as ~3.0) of a semiconductor in this case to about 250 nanometers. The limit is sometimes called the diffraction limit, a...

New research field promises radical advances in optical technologies

...of refraction" to less than one or less than zero. refraction occurs as electromagnetic waves, including light, ...viewed from the outside. Each material has its own refraction index, which describes how much light will bend in...one. Metamaterials, however, can make the index of refraction vary from zero to one, which possibly will enable ...

Researchers develop darkest manmade material

...ent. Lins team created a coating of low-density, vertically aligned carbon nanotube arrays that are engineered to have an extremely low index of refraction and the appropriate surface randomness, further reducing its reflectivity. The end result was a material with a total reflective index of 0.045 percen...
Refraction in Biological Products

Clarion mounting medium - DAB NBT TNBT Vega Red and Fuchsin from GeneTex

Description:...ng manual and automated cover slipping techniques. To assure excellent optical quality, Clarin has a refractive index of nD=1.473, which minimizes the refraction of the light beam as it travels from the glass through the mounting medium. Clarin is an environmentally responsible product containing no toluene, xy...
Company:GeneTex
Refraction in Biological Definition

Eye

... a focus they must be refracted . The amount of refraction required depends on the distance of the object whi...ss bending of light than a nearer one. Most of the refraction occurs at the cornea which has a fixed curvature. The remainder of the required refraction occurs at the lens. The lens can be pulled flatter...

Microscope

... the research microscope which is an expensive tool with many enhancements. Optical resolution A lens magnifies by bending light (see refraction ). Optical microscopes are restricted in their ability to resolve features by a phenomenon called diffraction which, based on the numerical apertur...
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