Crossword-Solution: ENTOPTIC 8 letters, 1 clue 🏆 scrabble score: 12

From these entencephalic photisms we seem to proceed by an easy transition to the most inward form of unmistakable entoptic vision--which is therefore the most inward form of all external vision--the flash of light consequent on electrisation of the optic nerve.

Midway, again, between entoptic and ordinary external vision we may place _after-images_; which, although themselves perceptible with shut eyes, presuppose a previous retinal stimulation from without;--forming, in fact, the entoptic sequelæ of ordinary external vision.

These defects, combined with entoptic impurities which are constantly floating about in the humours, all help to detract from the brightness and sharpness of the “perfect image.” [Sidenote: Blind spot.] This is a portion of the retinal field with no cones or rods, and therefore insensitive to light.

Various entoptic images, _muscæ volitantes_, etc., although constantly present, are hardly ever known.

That is to say that the eye supplies entoptic glimmerings, and the brain, acting on the suggestions thus received, superposes mental pictures to those glimmerings.[27] They are thus analogous to the pictures we may see in the fire or in the clouds.