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day17 - Psychology 2050 Perception 26 October 10 Day 17...

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Psychology 2050 Perception 26 October 10 Day 17
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      Acuity Reconsidered normal vision -- recognition acuity  vernier acuity resolution acuity retinal and preretinal optics  line spread and Airy's disk Fourier analysis & synthesis in 1D & 2D Gabor patches contrast sensitivity function  (csf)  
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      measurement of visual angles 360 ° complete circle around one’s head   10 ° width of fist at arm’s length      2 ° width of thumb at arm’s length 1 °         = 60 minutes of arc  (60’) 1 min  = 60 seconds of arc  (60”) 120 receptors/degree at fovea receptor ~ 30 seconds of arc
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recognition --  Snellen -  20/20, then 20/15        20/200 & driving, literacy required        size & distance Landolt -  literacy not required 30-60 sec of arc     (quarter @ 80 m)   vernier --  subreceptor   (hyperacuity)            ~ 5 sec of arc resolution --  receptor   60 sec of arc
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Snellen   Landolt Herman Snellen,  1862      receptor width        .5  deg or 30 sec arc recognition acuity E. Landolt  1889 Day 14
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receptor width        .5  deg or 30 sec arc recognition acuity serifs   Day 14
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the meaning of 20/20: “You can read at 20 feet what the person with ‘normal’ vision (near emmetrope) can read at 20 feet” metric equivalent is 6/6
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