5 Questions
What is the geometrical axis of the eye, and where does it pass through?
The geometrical axis is the axis of revolution of the eye, passing through the anterior and posterior poles of the eye.
What is the principle axis of vision, and how is it related to the visual axis?
The principle axis of vision is the line joining the fixated object to the center of the pupil, and it is parallel to the visual axis.
How is Angle K (cappa) measured, and what does a positive or negative value indicate?
Angle K is measured using the 'Synoptophore' device, and a positive value indicates a nasal angle, while a negative value indicates a temporal angle.
What is the fixation axis, and what does it join?
The fixation axis is the line joining the fixated object to the center of rotation of the eye.
What is the relationship between the optical axis and the pupillary axis, and what angle is formed between them?
The optical axis passes near the center of the pupil, which is decentered temporally, and the angle formed between them is Angle λ.
Test your knowledge of eye movement and duction, including the primary position of the eye, visual axis, and orbital axis. Perfect for optometrists and opticians studying orthoptics.
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