Fitxategi:Snellen06.png

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Laburpena

Snellen chart, ILLUSTRATIVE ONLY, NOT SUITABLE FOR VISION TESTING

Almost certainly public domain (from en wiki).

This image is in the public domain because its copyright has expired in the United States and those countries with a copyright term of life of the author plus 100 years or less.

This particular image is not a direct reproduction of any commercially available chart. It is derived from a very small reproduction that appears on p. 117 of "Big Secrets" by William Poundstone. "Big Secrets" is ©1983 by William Poundstone. No source is given for the chart, and it is not included among the many permissions acknowledgements that appear on the copyright page. This image has been extensively edited by Daniel P. B. Smith; in particular, all of the optotypes on lines 1 through 8 have been reworked.

Because the original Snellen chart was devised in 1862, and because I have not seen a copyright notice on Poundstone's or any other Snellen chart—even variations—I believe that this and all Snellen charts are in the public domain.

The optotypes in this chart are not precisely correct in their geometry or spacing, and the chart, even if enlarged to the proper size and viewed at the proper distance, is not appropriate for vision testing.

On the principle that an encyclopedia article should be accurate, this illustration presents the same letters in the same order as the traditional Snellen chart. Inexpensive Snellen wall charts are sometimes used for rough evaluation, as in the office of a primary-care physician. In any situations where visual acuity is being evaluated carefully, equipment capable of presenting a variety of letter arrangements is used. Vision testing devices in motor vehicle license offices, or in any situation where there is a concern that the examinee might attempt to deceive the examiner, do not use this sequence of letters.

Lizentzia

Honoko hau, domeinu publikoan dagoen bi dimentsioko artelan baten argazki-erreprodukzio fidela da. Artelana domeinu publikoan dago ondoko arrazoi hauengatik: Public domainPublic domainfalsefalse Lan hau jabetza publikoan dago bai bere jatorrizko herrialdean, bai egile eskubideak egilea hil eta 70 urtera edo gutxiagora iraungitzen diren gainerako herrialdeetan. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information). This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse Wikimedia Fundazioak duen jarrera ofiziala hau da:«domeinu publikoan dauden bi dimentsioko erreprodukzio fidelak domeinu publikokoak dira.» Argazki-erreprodukzio hau, beraz, domeinu publikokotzat hartzen da Estatu Batuetan. Beste jurisdikzio batzuetan eduki honen berrerabilera mugatua egon liteke; xehetasunetarako, ikus Reuse of PD-Art photographs. {{PD-Art}} template without license parameter: please specify why the underlying work is public domain in both the source country and the United States (Usage: {{PD-Art|1=|deathyear=''year of author's death''|country=''source country''}}, where parameter 1= can be PD-old-auto, PD-old-auto-expired, PD-old-auto-1996, PD-old-100 or similar. See Commons:Multi-license copyright tags for more information.)

Versions for print

aldatu

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  Letter size (North American)
  Vector (.svg-format)
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  A4 size (ISO standard)
  Vector (.svg-format)