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Human visual hardware is a result of a billion years
of evolution within the earths atmosphere where
light is scattered by molecules of air, moisture,
particular matter etc. However as we ascend into
our atmosphere with decrease density, light
distribution is changed resulting in our visual
hardware receiving visual data in different format.
Some Aspects to Consider: 1. Visual acuity is the
degree to which the details and contours of
objects are perceived. Visual acuity is usually
defined in terms of minimum separable.Large
variety of factors influence this complex
phenomenon which includes : # Optical factors-
state of the image forming mechanisms of the eye.
# Retinal factors such as the state of the cones. #
Stimulus factors such as illumination, brightness of
the stimulus, contrast between the stimulus and
background, length of time exposed to the
stimulus. * Minimum separable: shortest distance
by which two lines can be separated and still be
perceived as......

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