point vision

[5.11]

NOTE: This definition was changed in RP-16-17 Addendum 4. Deletions have a strike-through. New text is bold.

The mode of vision of a small source of light such that the sensation is determined by its intensity rather that by its size. Point vision occurs with sources so small that their former shape is not perceived and they appear as points of light; this generally means less than one minute angular subtense.

The mode of vision of a small source of light such that the sensation is determined by illuminance at the eye rather than by its size. Point vision occurs when a source is so small that its area no longer contributes to vision. This generally means less than one minute angular subtense.

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