wwp@yahoogroups.com:
RE: Misconcept of the Physiology of Eye Movement
Sacha Griffin 2010-Dec-22 19:09:00
True, but I don?t see how eye movement even correlates to pano motion. Your
eye view isn?t a whole screen size, it?s going to be a subset/small section
of the screen.
What we want to talk about is eye tracking. Objects in motion, Bezier curves
etc.
It?s far easier to keep a contract track on an important detail with
inertial movement.
Now, if we are talking about pano motions and headwear, your comments are
vital.
Sacha Griffin
Southern Digital Solutions LLC - Atlanta, Georgia
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Sent: Wednesday, December 22, 2010 1:59 PM
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Subject: Misconcept of the Physiology of Eye Movement
Sorry for posting this somewhat dry scientific information. But since I have
done quite a bit of ophthalmology in my active Life Science days, I have to
set this straight.
When the eyes scan a picture or a scene o rare reading a line of text, they
are moving smoothly around. The movement of the eye can be described in
three phases: acceleration - movement - deceleration.
This is wrong..
When the eyes scan a picture or a scene or are reading a line of text, they
are jumping from point to point. These jumps are called saccades. The
angular velocity of such a saccade depends on their amplitude. While a 10
degree saccade happens with with an angular velocity of 300 degrees per
second, a 30 degree saccade will happen with an angular velocity of 500
degrees per second. At a distance of 60 degrees the velocity will reach the
maximum speed of 600 degrees per second. When reading normal text (not
musical notation or mathematical formulas) the typical duration of a saccade
is 20 to 30 milli seconds. These high velocities can only be reached due to
the very low inertia of the eye.
So physiologically the eye is jumping at high angular velocities. The phases
of acceleration and deceleration are in the range of a few milliseconds.
Viele Gr??e
Carsten T. Rees
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