
	Where results make sense

Topic: Snellen chart

Related Topics

Visual acuity

Eyeglass prescription

Nurse Duckett

Eye

Third law

Optometrist

Myopia

Geometric Progression

Ochlocracy

Visual perception

Blazon

Test cricket

Chinese language

Samurai

All Creatures Great and Small

In the News (Tue 15 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Snellen chart Ophthalmology
		Snellen charts are named after the Dutch ophthalmologistHermann Snellenwho developed the chart in 1862.
		The symbols on an acuity chart are formally known as "optotypes." In the case of the traditional Snellen chart, the optotypes have the appearance of block letters, and are intended to be seen and read as letters.
		Wall-mounted Snellen charts are inexpensive and are sometimes used for rough assessment of vision, e.g.
	www.lumrix.com /medical/ophthalmology/snellen_chart.html (825 words)

	UK Keratoconus Self Help and Support Group
		A chart is used made up of capital letters, numbers, symbols or pictures which are larger at the top and smaller at the bottom of the chart.
		The top line of the chart is of a size that could be read at a distance of 60 metres by a person with normal distance vision.
		Of course, as you are only standing 3m from the printable chart, the top line should really be called "3/30" and the normal vision line "3/3", but things are confusing enough, so the chart is labelled using the more common numbers, even though it is designed to be viewed from 3m.
	www.keratoconus-group.org.uk /snellens/index.html (642 words)

	How Visual Acuity Is Measured
		The Tumbling E chart has the capital letter "E" facing in different directions and the person being tested must determine which direction the "E" is pointing, up, down, left, or right.
		The Snellen fractions, 20/20, 20/30, etc., are measures of sharpness of sight.
		For people who have worse than 20/400 vision, a different eye chart can be used that measures beyond 20/400 vision, or, for the most accurate measurements, a Low Vision Chart can be moved closer to the patient to measure the smallest letter that they can see at a lesser distance.
	www.mdsupport.org /library/acuity.html (816 words)

	Visual Acuity
		The chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834—1908) who created them as a test of visual acuity.
		That same person could stand 80 feet away from the chart and be able to decipher a 20/80 letter, or 200 feet away to be able to decipher a 20/200 letter.
		Therefore, the goal of an eye doctor should be to position the eye chart at “optical infinity,” or the least distance at which there is no significant accommodation by the crystalline lenses of a patient’s eyes.
	www.tedmontgomery.com /the_eye/acuity.html (1309 words)

	Encyclopedia - Snellen Eye Chart (Site not responding. Last check: 2007-11-02)
		The Snellen Eye Chart is the standard used in measuring the eye's ability to distinguish detail and shapes (visual acuity).
		The Snellen Chart is made up of a series of letters, numbers or symbols of progressively smaller size, the largest at the top.
		All measurements obtained from use of the Snellen Chart are a comparison to that standard.
	www.visionrx.com /library/enc/enc_snellen.asp (230 words)

	Snellen chart may be preferable over early treatment diabetic retinopathy study charts for rapid visual acuity ...
		The Snellen VA was recorded under standard illumination condition, from a 6 meter distance.
		A variety of letter charts have been introduced for measuring the resolution VA. [1],[2],[3] Snellen chart is a simple, most popular and familiar examination method for measuring VA. However, it has various disadvantages, like each letter line does not follow a geometric progression i.e.
		The ETDRS charts are superior to the Snellen chart in various respects and are commonly employed for VA assessment in clinical and research trials.
	www.ijo.in /article.asp?issn=0301-4738;year=2006;volume=54;issue=3;spage=214;epage=214;aulast=Tewari (765 words)

	Acuity Pro - Computer Acuity Chart & Eye Education Suite
		Of course the snellen chart is the default optotype with the standard order of letters (T Z V E C L) as default.
		If you are not familiar with the HOTV chart, here is a quick introduction: The entire chart consists of only the letters H O T, and V. The patient is given the HOTV card and told to point the letter on the card that corresponds with the letter on the screen.
		The simplicity of this chart allows it to be used on non-verbal patients, mentally challenged patients and patients who do not know (or are too young to know) the English alphabet.
	www.acuitypro.com /Features.html (1952 words)

	Eye Chart - Snellen Eye Chart at AllegroMedical.com
		The Snellen Eye Chart is used to test visual acuity, position the patient 10 or 20 feet in front of the Snellen eye chart (depending on model chosen).
		The eye chart itself -- the usual one is called Snellen's chart -- is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
		The 20 20 eye chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834-1908) who came up with them as a test of visual acuity.
	www.allegromedical.com /diagnostic-products-c521/snellen-eye-chart-p189809.html (230 words)

	The Rayleigh Criterion
		Visual acuity is typically measured with the use of a standard eye chart called the Snellen chart.
		Where such units are used, normal vision came to be characterized by the fraction 20/20, which corresponded to being able to distinguish the letters on the fourth line up from the bottom at a distance of 20 feet.
		The E on the chart has a standard height of 88 mm and the other letters are scaled accordingly.
	hyperphysics.phy-astr.gsu.edu /hbase/phyopt/raylei.html (591 words)

	Eye chart, Snellen's definition - Medical Dictionary definitions of popular medical terms
		Snellen's chart is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
		The letters on Snellen's chart are, not surprisingly, called Snellen's test type.
		The chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834-1908) who came up with them as a test of visual acuity.
	www.medterms.com /script/main/art.asp?articlekey=8555 (230 words)

	Snellen chart definition - Dictionary - MSN Encarta
		Snellen chart definition - Dictionary - MSN Encarta
		Search for "Snellen chart" in all of MSN Encarta
		eye test chart: a chart for vision testing on which are printed rows of letters and numbers in decreasing size from top to bottom
	encarta.msn.com /dictionary_1861709330/Snellen_chart.html (88 words)

	Snellen Eye Chart Kit Model SNELLENKIT at AllegroMedical.com
		These quality eye charts are designed to measure how well the patient sees various distances, each line decreases in size as you go down the chart.
		All eye charts are 22" x 11" and made of durable plastic.
		To test visual acuity, position the patient 10ft or 20ft (depending on the chart) in front of the eye chart.
	www.allegromedical.com /diagnostic-products-c521/snellen-eye-chart-kit-p215045.html (150 words)

	Diagnostic Tests — Snellen Test for Visual Acuity
		A Snellen test uses a chart with different sizes of letters or forms to evaluate your visual acuity-that is, the sharpness of your vision.
		In an eye clinic, you may have a more sophisticated version of this test in which you look at the chart through different strengths of lenses (a little bit like looking through a telescope) so that your doctor can find the proper strength of glasses or contact lenses for you.
		Sometimes the Snellen chart you see in an eye clinic is actually a reflection on a mirror from a projector in the back of the room.
	www.health.harvard.edu /fhg/diagnostics/snellen-test-for-visual-acuity.shtml (341 words)

	Snellen charts explained (Site not responding. Last check: 2007-11-02)
		The Snellen chart tests Distance Visual Acuity (distance vision) and is only one of the tests
		pictures which are larger at the top and smaller at the bottom of the chart.
		The top line of the chart is of a size that could be read at a distance of 60 metres by a person
	freespace.virgin.net /amanda.gibson/snellen.htm (188 words)

	Snellen Chart - Aging Eye .com
		This is the same chart that your doctor uses to determine your visual acuity.
		The normal height for the letter A is 88 mm, and the viewing distance is 6 meters.
		For information on using the chart to determine your visual acuity, see "How Visual Acuity Is Measured" in the MD Support Library.
	www.agingeye.com /about/snellen_chart.php (117 words)

	Ultimate Random Snellen Eye Chart Generator (Site not responding. Last check: 2007-11-02)
		Due to the popularity of Alejandro Saksida's Ultimate Random Snellen Eye Chart Generator, to conserve bandwidth, we request that if you like the Eye Chart Generator, that you download a ZIP Archive of the generator for off-line use.
		It only takes up about 200K on your hard disk, and includes both the small-screen (800x600) and large-screen (1024x768) versions.
		Otherwise, if you'd just like to try out the Eye Chart Generator on the web, please proceed...
	www.i-see.org /random_snellen/random_snellen.html (88 words)

	eye test chart snellen distance vision (Site not responding. Last check: 2007-11-02)
		The chart is usually read while standing at a distance...
		EYE CHARTS Snellen Eye Chart.95 E-7070 Snellen Eye Chart with red and green color bars.
		This is the number one site for eye test chart snellen distance vision, check our pages for all that you need to know.
	www.realty250.info /articles/eye-test-chart-snellen-distance-vision.html (959 words)

	Pocket Snellen Chart on PocketGear.com (Site not responding. Last check: 2007-11-02)
		Summary: Pocket PC Snellen visual acuity test, permits rapid vision assessment, USA / UK font style, + Tumbling E's and Landholt C charts.
		This software permits rapid assessment of visual acuity at a bedside or in an office, in the standard Snellen format, where formal visual acuity testing equipment is not available.
		Distance acuity may be tested at 3 or 6m.
	www.pocketgear.com /software_detail.asp?id=18213 (100 words)

	LaserMyEye :: Encyclopedia :: Snellen eye chart
		The traditional high-contrast eye chart, with fl letters on an illuminated white background, starting with a big letter E at the top and with rows of progressively smaller letters.
		Are we missing a good link on this page?
		Use of this website is subject to LaserMyEye's Terms of Use.
	www.lasermyeye.org /encyclopedia/snellenchart.html (79 words)

	Amazon.com: Snellen Eye Chart - Model 20 Foot: Health & Personal Care (Site not responding. Last check: 2007-11-02)
		Amazon.com: Snellen Eye Chart - Model 20 Foot: Health & Personal Care
		Buy this item with Kindergarten Plastic Eye Chart - Options 20 Foot by Graham Field today!
		ScientificsOnline.com Find an Eye Test Chart at Edmund Scientific.
	www.amazon.com /Snellen-Eye-Chart-Model-Foot/dp/B000BI3W56 (880 words)

	Eye Test - Check your Visual Acuity with the Snellen Chart
		Take 3 large steps back from your computer screen (approximately 3 meters).
		Close your left eye and read the numbers on the chart with your right eye.
		Repeat step 2 by reading the numbers with your left eye.
	www.spectacleworld.co.za /eyetest.htm (185 words)

	Snellen Eye Chart
		3-D Symbol Test and Eye Charts > Snellen Eye Chart //-->
		To order, change the quantity to your need, and click "Add to Cart."
		Take a look at this product: Snellen Eye Chart
	www.medcosupply.com /List/Product.asp?Leaf_Id=5580137 (33 words)

	Reliability of the Snellen chart -- McGraw et al. 310 (6993): 1481 -- BMJ
		Reliability of the Snellen chart -- McGraw et al.
		Jump to: Page Content, Site Navigation, Site Search,
		HighWire Press - Feedback - Help - © 1995 BMJ Publishing Group Ltd.
	www.bmj.com /cgi/content/full/310/6993/1481 (89 words)

Try your search on: Qwika (all wikis)