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<blockquote data-quote="WayneF" data-source="post: 324685" data-attributes="member: 12496">OK, but&nbsp; <a href="http://en.wikipedia.org/wiki/Snellen_chart#Snellen_fraction" target="_blank">Snellen chart - Wikipedia, the free encyclopedia</a> says:&nbsp; &quot;The chart is at a distance of 20 ft, but a person with normal acuity&nbsp; could be expected to read these letters at a distance of 40 ft. This&nbsp; line is designated by the ratio 20/40. If this is the smallest line a&nbsp; person can read, the person's acuity is &quot;20/40,&quot; meaning in a very rough kind of way&nbsp; that this person needs to approach to a distance of 20 ft to read&nbsp; letters that a person with normal acuity could read at 40 ft. In an even&nbsp; more approximate manner, this person could be said to have &quot;half&quot; the&nbsp; normal acuity.&quot;There is NOTHING there about focusing at 25 or 40 feet.&nbsp; It says you have to stand closer to make out the detail of the letters.And, even if the subject were at 25 feet, you see it &quot;an image&quot; of it at a few inches in the camera viewfinder.I am trying to suggest that you would like the correct glasses.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="WayneF, post: 324685, member: 12496"] OK, but [URL="http://en.wikipedia.org/wiki/Snellen_chart#Snellen_fraction"]Snellen chart - Wikipedia, the free encyclopedia[/URL] says: "The chart is at a distance of 20 ft, but a person with normal acuity could be expected to read these letters at a distance of 40 ft. This line is designated by the ratio 20/40. If this is the smallest line a person can read, the person's acuity is "20/40," meaning [I]in a very rough kind of way[/I] that this person needs to approach to a distance of 20 ft to read letters that a person with normal acuity could read at 40 ft. In an even more approximate manner, this person could be said to have "half" the normal acuity." There is NOTHING there about focusing at 25 or 40 feet. It says you have to stand closer to make out the detail of the letters. And, even if the subject were at 25 feet, you see it "an image" of it at a few inches in the camera viewfinder. I am trying to suggest that you would like the correct glasses. :) [/QUOTE]

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