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    Re: "Vernier acuity" of horizon IC tests
    From: Douglas Denny
    Date: 2009 Jul 5, 15:31 -0700

    With consideration of the last posting regarding retinal receptors and vernier acuity:
    I note the practical results of horizon index error measurement here by Mr. 
    Rudzinski, and of the results in the paper by Gordon; and the results posted 
    by others here,  amount to around 0.4 minute of arc to one minute of arc.
    The cone diameter is about 0.4 minute of arc.
    'Normal' visual acuity (depending on the target type) is between 0.4 and one minute of arc.
    Curious coincincidence, do you not think?
    Douglas Denny.
    Chichester. England.
    Navigation List archive: www.fer3.com/arc
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