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admin 30.03.2014

The Snellen chart is also designed (roughly) so that 3 lines is equivalent to a factor of 2 loss in visual acuity (i.e. The advantage of this chart over a conventional Snellen type chart is that the visual acuity differences are not affected by viewing distance or other conditions that affect visual acuity. The first one of these special eye charts is the astigmatic mirror that is used to diagnose and reduce astigmatism.
This beautiful limited edition handmade retro eye test chart celebrates the unique and supremely talented musical legend, David Bowie.
Modelled on the classic eye chart, that was developed by Dutch ophthalmologist Herman Snellen in 1862, this stylish typographic artwork would look great in any home. You have 28 days, from receipt of cancellable goods, to notify the seller if you wish to cancel your order or exchange an item.
Read more about our returns policy.Should you choose to return or exchange your order you will need to deliver the item(s) to the UK, where this seller is based. I smile when I hear patient’s tell me that eye test’s have become more complex than when they were children and I beam when a patient tells me that I have given them the most thorough eye test that they have ever had. Long gone are the days of just reading a few letters on the chart and being told to come back in two years. Your car has a MOT yearly, so do your teeth, your physical exam and even your beloved family pet has a yearly check up.


Well each and every single person is different and so are their needs, we always recommend one of our more intensive tests to make sure that your eyes are getting the best health care.
We feel that all our patients should have access to any of the tests we provide so we have ensured that our NHS patients have these tests available to them at a subsided fee. At EyeDeal Vision, from the moment you walk through our doors we will be by your side, guiding you through the whole journey. This chart uses Snellen Optotypes, it is sized for 10 ft viewing, and has LogMar values (times 10) shown on the right.
Changing viewing distance will of course make the visual acuity measurements wrong, but because it simply adds an offset to the Logmar value, it will not (theoretically anyway), affect the visual acuity difference.
This means that the LogMar values on this chart should be adjusted by subtracting 10 x log of 2 =(10 * 0.301), or simply 3. The chart lists many of the famous alter egos from stage and screen of a certain Mr David Jones and would be a wonderfully original gift for any Bowie fan. You can choose from either the Gold, Sliver and Bronze tests, Gold and Silver being our more popular tests. We also have designed a similar eye chart that we think is superior that can be downloaded (see below). This would provide a bit less resolution for testing visual acuity, which might not matter, but would destroy the comparability of the DIE test done with a different chart.


However, this doesn't always work, probably because the numbers of the Snellen chart generally are multiples of 10 feet -- this simplicity would be lost if the numbers scaled logarithmically. This chart is used by simply recording the 10*LogMar value that a person can see with the head still, the value that a person can see while an examiner is oscillating their head. Be sure not to print this chart in a different scale than it's native scale, as if you do this, the visual acuity values will not be correct. Your eyes also need the same yearly loving attention, just like all the other aspects of your life.
It is full in the respect the basics are all covered but does not cover any intensive checks. We have used 10*LogMar, to make the numbers roughly comparable to those on the conventional Snellen Chart.
For example, the NHS does not cover diagnostic checks like the OCT, retinal photography, Gonioscopy or Pachymetry which are apart of the extensive Glaucoma check.



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