Blue field entoptic phenomenon

The blue field entoptic phenomenon is an entoptic phenomenon characterized by the appearance of tiny bright dots (nicknamed blue-sky sprites) moving quickly along undulating pathways in the visual field, especially when looking into bright blue light such as the sky.

While seeing the phenomenon, lightly pressing inward on the sides of the eyeballs at the lateral canthus causes the movement to stop being fluid and the dots to move only when the heart beats.

[5] Blue light (optimal wavelength: 430 nm) is absorbed by the red blood cells that fill the capillaries.

Scheerer's phenomenon consists of corpuscles of identical diameter and visual sharpness, of a simple dot or worm-like shape, brighter than the background.

If the eye moves, the floaters follow sluggishly, because they are contained in the vitreous humor, which, being gelatinous, is subject to inertia.