Refraction

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 ... lenses made from materials that exhibit negative refraction could compensate for this aberration and enable ... the Princeton metamaterial is capable of negative refraction of light in the mid-infrared region, which is ...

Getting light to bend backwards

... 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" ... 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 ...

X-rays for early Alzheimer's disease detection

... 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 ...

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) ....

New Low-Risk Eye Surgery Option at AIIMS

... 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 ...

Women Get A Raw Deal In Treatment of Heart Disease

... 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 ...

Lasik surgery effective in correcting vision

... 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

... 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

Evolution Vision Diagnostic System

Description:... control and is priced well below other automated refraction systems. The Evolution gives the practitioner complete control of the refraction process through the handheld remote control. With ... practitioner can pre-program his or her entire refraction process, increasing exam ....
Company:Marco Ophthalmic, Inc.

TR-4000 Auto Refractor

Description:... offers superb quality at an excellent price. Automatic refraction Measurements The TOMEY TR-4000 Auto Refractor provides highly accurate ... seconds) measurement time and a unique multi-averaging system for accurate refraction readings. The TR-4000 will automatically detect to measure the IOL ...
Company:Tomey Corp.

CV-3000 Computerized Vision Tester

Description:... CV-3000 Computerized Vision Tester offers the latest features in automated refraction and expands the many features of our complete EXAM-3000 refraction System. Today's demand for delegating the refraction, electronic ...
Company:Topcon America Corporation

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 ...
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 ....
Company:NIDEK, Inc.

RC-5000 AutoRefractor-Keratometer

Description:... 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 ...
Company:Tomey Corp.

AXIS II PR Post Refractive

Description:... 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. ...
Company:Quantel Medical, Inc.

ClearChart Digital Acuity System

Description:... 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 ....
Company:Reichert, Inc.

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

Description:... 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 ...
Company:Carl Zeiss MicroImaging, Inc.

Matrix Acrylic IOL

Description:... Biostability Unique foldable hydrophobic acrylic material Single monomer formulation developed to be biostable High index of refraction Biomechanics Highest tensile strength designed to resist optic damage during folding and insertion Polyvinylidene (PVDF) haptics ...
Company:Medennium, Inc.

More>>

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 - ...

Refraction in Medical Dictionary

Refraction

... refraction test Definition: The refraction test is an eye exam that measures a person's ... distance. Alternate Names : Eye Test - refraction , Vision Test - ...

Refraction test

... refraction test Definition: The refraction test is an eye exam that measures a person's ... : AllRefer.com > Health > Tests & Exams > refraction Test : What do Abnormal Results Mean? ...

Color vision test

... Vision Test - Color ( Color Vision Test ) Vision Test - refraction ( refraction Test ) Visual Acuity Test Visual Acuity Test - Home (Home Vision ...

Fluorescein

... Acuity Test ) Eye Test - Color ( Color Vision Test ) Eye Test - refraction ( refraction Test ) ... Orange dye ( fluorescein ) is usually put in your eye to ...

Fluorescein angiography

... Acuity Test ) Eye Test - Color ( Color Vision Test ) Eye Test - refraction ( refraction Test ) ... If your doctor suspects a problem with the blood vessels ...

Ophthalmoscopy

... of tests designed to evaluate your vision and check for eye disease s. It doesn't hurt. Direct and indirect ophthalmoscopy Visual acuity refraction test Color defectiveness determination Pupil lary reflex response Slit-lamp exam ination Intra ocular pressure determination Ultrasound of ...

Orbit

... Disease s - Disease s of the bony orbit and contents except the eyeball. Refractive Errors - Deviations from the average or standard indices of refraction of the eye through its dioptric or refractive apparatus. Retina l Disease s ... Orbit al radiotherapy was once a common treatment for ...

Presbyopia

... four segments that are implanted just below the surface of the sclera . See surgical reversal of presbyopia (SRP). It is caused by a defect of refraction in which the image is focused behind the retina of the eye rather than upon it, either because the eyeball is too short or because the ...

Refraction in Biological News

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

... 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

... 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 ...

Scientists focus on 'dwarf eye'

... 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 ...

Refraction in Biological Technology

New research field promises radical advances in optical technologies

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

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, ...

Researchers develop darkest manmade material

... 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 ...

Refraction in Biological Products

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

Description:... 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, ...
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 ... 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 ...

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 ...