Precision of snellen eye charts - Printable Version +- Eyesight Improvement Forum (https://www.iblindness.org/forum) +-- Forum: General Discussion (https://www.iblindness.org/forum/forumdisplay.php?fid=4) +--- Forum: Bates Method (https://www.iblindness.org/forum/forumdisplay.php?fid=5) +--- Thread: Precision of snellen eye charts (/showthread.php?tid=1242) |
Precision of snellen eye charts - Alexndre - 07-15-2009 Hello everybody! This morning, I was asking me if the snellen test cards that we can find on internet and print on a letter-format sheet are accurate. I saw that the corresponding letter on differents charts are not always the same size. I personally use this one: <!-- m --><a class="postlink" href="http://www.disabled-world.com/artman/publish/eye-chart.shtml">http://www.disabled-world.com/artman/pu ... hart.shtml</a><!-- m --> But the one on this page have smaller letters: <!-- m --><a class="postlink" href="http://www.central-fixation.com/resources.php">http://www.central-fixation.com/resources.php</a><!-- m --> And this one seems okay with the one I use: <!-- m --><a class="postlink" href="http://www.i-see.org/eyecharts.html">http://www.i-see.org/eyecharts.html</a><!-- m --> So, does someone here buyed a ''true'' snellen test card? And can you tell me what snellen is the most accurate with a true chart? What snellen eye chart did you use? Have a nice day! Re: Precision of snellen eye charts - otis - 07-15-2009 Dear Alex, Subject: What is the "perfect" size of the letters on a Snellen. Where ever you obtain your Snellen, you should always check the following: 20/60 must be 1 inch high. 20/20 must be 3/8 inch high. Measurements should be on a brightly illuminated Snellen. In metric, the distanc is 6 meters. 20/20 means 6/6 with the letter size 0.9 cm 6/12 means the letter size must be 1.8 cm. This will callibrate any Snellen -- for legal and personal purposes. This should duplicate the test conditions in an "office" Snellen or the DMV test. In general the DMV tests for 20/40 or better. It is indeed a "milestone" to verify in your Bates work that you can clear that line. Re: Precision of snellen eye charts - Alexndre - 07-17-2009 Thank you very much for your answer! I'll check my snellen when I will have a minute. Have a nice day of improvement! ;D Re: Precision of snellen eye charts - Alexndre - 07-19-2009 I verified my differents snellen charts and the one that I use have slightly smaller letter than it should be and the one on central-fixation.com have letter that are too small to be accurate. At least, it give letters of different sizes and that's what we need. Have a nice day! Re: Precision of snellen eye charts - clarknight - 07-19-2009 I can send you a free chart through E-Mail if you like. Has a variety of charts in one PDF. Not perfect sizes but you can print it to size or change on a copier. mclearsight@aol.com Also just made a 8x11 Inverted E Pothooks chart. Re: Precision of snellen eye charts - Alexndre - 07-20-2009 Thank you very much but I think I will stay with my current chart that I know by heart. It reduce my strain level to read it. Have a nice day! Re: Precision of snellen eye charts - josh24 - 07-29-2010 HOW IT BE POSSITIVELY POSTED WHEN THE YOU HAVE A POOR EYESIGHT! IS IT NESCESSARY THAT YOU WIL GO TO YOUR DOCTOR AND FOLLOW AS IT PRESCRIBED..? how to get a girl to like you Re: Precision of snellen eye charts - VolcomStone54 - 09-07-2010 Hello Guys, Thanks josh24 for your given information. Ive learned lot of ideas about this topic, BTW im a new one in this forum. Thanks a lot, make money online |