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nodal point

nodal point In this historical optics usage, the nodal point is the reference point in the “reduced” eye through which a straight line from a luminous point is drawn and extended to the retina.

In this historical optics usage, the nodal point is the reference point in the “reduced” eye through which a straight line from a luminous point is drawn and extended to the retina. It serves to determine where that light source is represented on the retina.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Line of Direction” (Line of Direction).
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PsychTerms (psychterms.org), CC BY 4.0, version 1. “nodal point.” Development preview.

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