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.
Read more about this topic: Blue Field Entoptic Phenomenon
Famous quotes containing the words difference and/or phenomena:
“The difference of the English and Irish character is nowhere more plainly discerned than in their respective kitchens. With the former, this apartment is probably the cleanest, and certainly the most orderly, in the house.... An Irish kitchen ... is usually a temple dedicated to the goddess of disorder; and, too often, joined with her, is the potent deity of dirt.”
—Anthony Trollope (1815–1882)
“Anyone who seeks for the true causes of miracles, and strives to understand natural phenomena as an intelligent being, and not to gaze at them like a fool, is set down and denounced as an impious heretic by those, whom the masses adore as the interpreters of nature and the gods. Such persons know that, with the removal of ignorance, the wonder which forms their only available means for proving and preserving their authority would vanish also.”
—Baruch (Benedict)