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Schematic sketch of a selection of ocular axes and angles formed by these axes. The axes are indicated by the following lines; solid black (line of sight), solid blue (pupillary axis), dashed green (visual axis), dashed red (optical axis), and dashed black (videokerato-scope axis). The center of curvature of the posterior cornea C2 is omitted for the sake of clarity. The exit pupil is also omitted for clarity although its center EP’ is shown.
