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#51
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Let's Photograph Comet 46P Wirtanen
On Wednesday, December 26, 2018 at 4:39:50 PM UTC-5, Paul Schlyter wrote:
No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. Since most doctors worldwide would describe visual acuity as 20/20 or 6/6, your Swedish eye doctor's notation would be the idiosyncracy. Look, we get that you don't like the USA or anything much about it. So let's get this back on topic and talk about amateur astronomy and how difficult it must be to observe from Stockholm. |
#52
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Let's Photograph Comet 46P Wirtanen
On Wed, 26 Dec 2018 22:39:47 +0100, Paul Schlyter
wrote: I havent a clue. All I can say is that maybe your local eye doctor might have an answer. No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. No, that's not at all what your local eye doctor would do. If he were using a Snellen test to screen your visual acuity (as is common all over the world, including Sweden), he would properly express your results as a Snellen fraction, defined by European ISO 8596, giving both the numerator (distance) and the denominator (a normalized distance). The fraction is never reduced. The only difference between the American and the European fractions is that in Europe it's normally metric. In the U.S. we have 20/20 as normal vision, in Europe it's 6/6. The Snellen fraction is most certainly not an American idiosyncrasy. |
#53
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Let's Photograph Comet 46P Wirtanen
Paul Schlyter:
No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. And Canadian, Middle Eastern, Chinese, Indian, South American, Japanese, Indonesian... Time tested and proven. -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |
#54
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Let's Photograph Comet 46P Wirtanen
Chris L Peterson wrote:
[…] he would properly express your results as a Snellen fraction, defined by European ISO 8596, As the name already indicates, standards with prefix “ISO” (International Organization for Standardization) is NOT a “European” standard, but an *international* one. -- PointedEars Twitter: @PointedEars2 Please do not cc me. / Bitte keine Kopien per E-Mail. |
#55
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Let's Photograph Comet 46P Wirtanen
On Thu, 27 Dec 2018 13:59:24 +0100, Thomas 'PointedEars' Lahn
wrote: Chris L Peterson wrote: […] he would properly express your results as a Snellen fraction, defined by European ISO 8596, As the name already indicates, standards with prefix “ISO” (International Organization for Standardization) is NOT a “European” standard, but an *international* one. Not all ISO standards are adopted by all ISO body members. ISO 8596 is adopted by all the European members. And the point here is that we're discussing a European country. |
#56
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Let's Photograph Comet 46P Wirtanen
On Wed, 26 Dec 2018 20:11:23 -0500, Davoud wrote:
Paul Schlyter: No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. And Canadian, Middle Eastern, Chinese, Indian, South American, Japanese, Indonesian... Time tested and proven. And awkward. It is unnecessarily complex. |
#57
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Let's Photograph Comet 46P Wirtanen
On Wed, 26 Dec 2018 17:11:40 -0700, Chris L Peterson
wrote: On Wed, 26 Dec 2018 22:39:47 +0100, Paul Schlyter wrote: I havent a clue. All I can say is that maybe your local eye doctor might have an answer. No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. No, that's not at all what your local eye doctor would do. If he were using a Snellen test to screen your visual acuity (as is common all over the world, including Sweden), he would properly express your results as a Snellen fraction, defined by European ISO 8596, giving both the numerator (distance) and the denominator (a normalized distance). The fraction is never reduced. The only difference between the American and the European fractions is that in Europe it's normally metric. In the U.S. we have 20/20 as normal vision, in Europe it's 6/6. The Snellen fraction is most certainly not an American idiosyncrasy. Then how come the last time I had my eyes examined I got a visual acuity of 1.1 on my left eye and 1.2 on my right eye? |
#58
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Let's Photograph Comet 46P Wirtanen
On Thu, 27 Dec 2018 17:22:59 +0100, Paul Schlyter
wrote: On Wed, 26 Dec 2018 17:11:40 -0700, Chris L Peterson wrote: On Wed, 26 Dec 2018 22:39:47 +0100, Paul Schlyter wrote: I havent a clue. All I can say is that maybe your local eye doctor might have an answer. No he wouldn't. My local eye doctor wouldn't even say 20/30, she would say 0.67 perhaps rounding it to 0.7 - as would most European eye doctors. The 20/xx stuff is an American idiosyncracy. No, that's not at all what your local eye doctor would do. If he were using a Snellen test to screen your visual acuity (as is common all over the world, including Sweden), he would properly express your results as a Snellen fraction, defined by European ISO 8596, giving both the numerator (distance) and the denominator (a normalized distance). The fraction is never reduced. The only difference between the American and the European fractions is that in Europe it's normally metric. In the U.S. we have 20/20 as normal vision, in Europe it's 6/6. The Snellen fraction is most certainly not an American idiosyncrasy. Then how come the last time I had my eyes examined I got a visual acuity of 1.1 on my left eye and 1.2 on my right eye? Because you have an incompetent eye doctor who doesn't observe standards? Maybe a homeopath or some other quack? |
#59
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Let's Photograph Comet 46P Wirtanen
Chris L Peterson wrote:
[…] Thomas 'PointedEars' Lahn […] wrote: Chris L Peterson wrote: […] he would properly express your results as a Snellen fraction, defined by European ISO 8596, As the name already indicates, standards with prefix “ISO” (International Organization for Standardization) is NOT a “European” standard, but an *international* one. Not all ISO standards are adopted by all ISO body members. ISO 8596 is adopted by all the European members. Cite evidence. -- PointedEars Twitter: @PointedEars2 Please do not cc me. / Bitte keine Kopien per E-Mail. |
#60
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Let's Photograph Comet 46P Wirtanen
On Thu, 27 Dec 2018 23:30:35 +0100, Thomas 'PointedEars' Lahn
wrote: Chris L Peterson wrote: […] Thomas 'PointedEars' Lahn […] wrote: Chris L Peterson wrote: […] he would properly express your results as a Snellen fraction, defined by European ISO 8596, As the name already indicates, standards with prefix “ISO” (International Organization for Standardization) is NOT a “European” standard, but an *international* one. Not all ISO standards are adopted by all ISO body members. ISO 8596 is adopted by all the European members. Cite evidence. No. You're not worth the effort. |
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