medical meaning of "Meridian"
A video tutorial is using a spoon to explain how astigmatism occurs.
the cornea ideally
should be perfectly round like a
ping-pong ball which is a perfect sphere
and has the same curvature in all
directions astigmatism occurs when the
cornea is not perfectly round and has a
steeper and a flatter Meridian like the
back of the spoon
where the speaker uses the word "Meridian", does "Meridian" here mean "an imaginary line between the North Pole and the South Pole, drawn on maps to help to show the position of a place" or some other medical meaning?
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Meridian of the eye: Considering the center of the pupil as a pole, imaginary lines are drawn around the eyeball that is intersected at the poles (both anterior and posterior) and are called as the meridians of the eye. The flattest and steepest meridians of the eye are termed as the principal meridians.
www.news-medical.net/health/Astigmatism-Types-Regular-and-Irregular.aspx
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