Snellen chart.

Table Snellen Acuity Eye Test.

Excuse letter "E" Being in Table Top Eye Test
The letter "E" is always at the top position on the eye test table, then followed by other letters. Almost all over the world use these tables as a standard eye test. Why is that ...?
Professor Hermann Snellen a professor in the field of eye health this is the Dutch creator of the eye test table, so the table is known as the Snellen chart. Prof. Snellen then replace Dr. Frans Cornelis Donders, as the director of the Netherlands Hospital for Eye Patients. He was trying to make a standard test for the detection of visual acuity, as well as to measure how small images which can be captured by the eye.
At the beginning of 1862 a year of making this table the letter "A" in the top position, followed by other letters, but was later replaced with the letter "E". Because the patient is currently undergoing tests using memorizing the position of the eye over the letter, not sight. Dr. Donders first examine how eye catching letter E, then Prof. Snellen continue what his predecessor which has been investigated by it, and creates a complicated formula based on three parallel lines of all the letters of the alphabet. Uppercase letter E in the table have white space and black space with the same height and width, so the key for visual acuity. If the patient has a vision less sharp then the letter E will look like the letter B, F, P, and L (having a line parallel with the letter E). Because of the importance of the letter E is, Prof. Snellen letter E slipped among many other letters.
Thank you for reading this article. Written and posted by Bambang Sunarno. sunarnobambang86@gmail.com
author:
http://schema.org/Personal.
https://plus.google.com/105319704331231770941.
name: Bambang Sunarno.
http://www.1911blogs.blogspot.com/2014/08/snellen-chart.html
DatePublished: August 15, 2014 at 15:02

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Tag : Snellen chart.