FOVea
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Fixation
Axis: This is a
straight line that joins center of
rotation of eyeball with fixation point
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Optical
Axis: A line passing through center of cornea, center of
lens and posterior pole of retina is the optical axis of eyeball
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Visual
Axis: A line joining
point of fixation with fovea and passing through nodal point of eyeball is
called visual axis. Nodal point of eyeball is just anterior to posterior
capsule of lens. Fixation point is the point which is being seen with fovea at
any particular moment.
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Pupillary Line:
This is a straight line that passes
through center of pupil
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