Talk:Averted vision
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Cone density
[edit]It doesn't seem that the mention of the density of the cones in the fovea is relevant, as the article on scotopic vision states that cones are non-functional in low light. So the rather that the rod density is higher than the cone density has nothing to do with averted vision, simply the fact that the rod density itself is nonexistant in the fovea, and rods are the effective type of optical receptor in low light. I'd suggest a re-wording, maybe I'm missing something. 128.227.68.119 12:24, 31 May 2007 (UTC)
- Yes, I think you are correct that the density is not really important: what is important is the absence of rods in the center. I was mainly going off what I had read in this article. I reworded it to make it more clear and concise. Feel free to improve it further if you can. Danski14(talk) 18:25, 31 May 2007 (UTC)
Unverified claim with no citations or supporting evidence.
[edit]How appropriate is this sentence in an encyclopaedic context: "By developing the technique, some observers report a gain of up to three or four magnitudes (15:1 to 40:1)." Really? An improvement by a factor of FOUR magnitudes / 40 TIMES simply by practicing, without any citations or any other material to back it up? By the same argument, millions of people "report" being kidnapped by aliens, sometimes more than once in their lives. Does that make it a verifiable event? Old_Wombat (talk) 12:41, 25 September 2011 (UTC)
Assessment comment
[edit]The comment(s) below were originally left at Talk:Averted vision/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
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| The article appears to be based on more folklore than fact.
Suggesting averted vision might improve threshold visibility by 3-4 magnitudes, a factor of 15 to 40 in brightness seems unrealistic. I have never noted a loss in sensitivity near my point of fixation of this magnitude. Modern texts on perimetry, a common clinical technique in ophthalmology, consistently show the peak sensitivity of the visual system corresponds to an area within one-half degree of the point of fixation [Anderson, D. (1987) Perimetry: with and without automation, pg 25]. At 8-16 degrees from the point of fixation, the visual acuity of the eye is reduced by at least a factor of five. Try viewing the Pleides at 8-16 degrees from your point of fixation (after first viewing them at your point of fixation. You will do well to observe any of the group. I was unaware this tried-and-true observing technique could be considered "controversial." If it is "folklore" then it is pretty much universal folklore among everyone I've ever known who was more than a casual astronomer. | |
Last edited at 02:55, 22 February 2009 (UTC). Substituted at 08:42, 29 April 2016 (UTC)
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