Blue Field Entoptic Phenomenon - Difference From Other Entoptic Phenomena

Difference From Other Entoptic Phenomena

Scheerer’s phenomenon can be easily distinguished from floaters (muscae volitantes). 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 stops moving, the dots keep darting around. If the eye moves, the dots follow instantaneously, because they are contained in the retina. In contrast, floaters are specks or threads of variable diameter and variable visual sharpness, some of complex shape, darker than the background. If the eye stops moving, the floaters settle down. If the eye moves, the floaters follow sluggishly, because they are contained in the vitreous humor which is subject to inertia. There are also several phosphenes that need to be distinguished from Scheerer’s phenomenon.