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Medical Forum / General / Vision / December 2006Resolution limit of the eye and cone spacing
Hello ng, I read that the diameter of a cone in the fovea is about 1 µm and that the spacing between two adjacent cones is about 2,5 µm. Is it possible to calculate the resolution limit of the eye by those figures (sadly, my knowledge in mathematics isn´t deep enough to do it myself!)? Most textbooks state that the average eye can resolve 60 seconds of visual angle. Does this measure correspond in some way to the cone spacing? Thanks for your input! Gregory Wool > I read that the diameter of a cone in the fovea is about 1 µm and that > the spacing between two adjacent cones is about 2,5 µm. Is it possible > to calculate the resolution limit of the eye by those figures (sadly, > my knowledge in mathematics isn´t deep enough to do it myself!)? Most > textbooks state that the average eye can resolve 60 seconds of visual > angle. Does this measure correspond in some way to the cone spacing? In addition to whatever responses you get, you may want to search the group. The subject of theoretical limits of human visual acuity comes up pretty frequently. Neil For whom it's really a moot point.... > > I read that the diameter of a cone in the fovea is about 1 µm and that > > the spacing between two adjacent cones is about 2,5 µm. Is it possible > > to calculate the resolution limit of the eye by those figures (sadly, > > my knowledge in mathematics isn´t deep enough to do it myself!)? Most > > textbooks state that the average eye can resolve 60 seconds of visual > > angle. Does this measure correspond in some way to the cone spacing? In addition to whatever responses you get, you may want to search the group. The subject of theoretical limits of human visual acuity comes up pretty frequently. Neil Dear Neil, I searched a lot but couldn´t find anything about the calculation of the above mentioned measure. If you know about the calculation would you please be so kind to tell me? Gregory Dear Gregory, Yes the calculations have been conducted. In fact, a few eyes do slightly better than the calculations would predict! Also, in bright light, some calculations show that the eye will be diffraction limited with an iris of 2 mm to about 1/2 minute-of-arc. You will get endless debate about this subject. Best, Otis > Hello ng, > [quoted text clipped - 7 lines] > Thanks for your input! > Gregory Wool What might really rock your boat too, is the fact that you can see better with both eyes rather than one. > Dear Gregory, > [quoted text clipped - 25 lines] > > Thanks for your input! > > Gregory Wool Dear OD to be, Yes, correct again. In fact the JAA (Joint Aviation Authority) only requires that each eye pass the 20/30 line, but BOTH eyes pass the 20/20 line. In fact most DMV tests are generally written this way: Both eyes must have 20/40 together, or 20/40 with the better eye -- with the other eye allowed 20/50 to 20/60 -- to account for the ususal difference of 1/2 diopter between the nonmaly eyes. With both eyes you see the composite of BOTH eyes. Your are correct. Best, Otis > What might really rock your boat too, is the fact that you can see > better with both eyes rather than one. [quoted text clipped - 28 lines] > > > Thanks for your input! > > > Gregory Wool [snip] Come on, Otis: Answer them. Man up. http://nbeener.com/OSB_Questions.txt |
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