Entoptic images are visual effects which
originate within the visual processing system of the observer. The
term ‘entoptic’ comes from the Greek for ‘within vision’, indicating
that the images come from anywhere within the optic system, between the
eye itself and the neural cortex where signals from the optic nerve are
interpreted. Since it originates within the visual system, entoptic
imagery can only be seen by the observer.
Types of Entopic Images
There are a variety of types of entoptic
images which originate in different parts of the visual system. Some
of the most well understood entoptic effects originate within the
eyeball itself. These include floaters, which are formations of protein
clumps in the vitreous gel of the eyeball that can be seen when looking
at a bright, blank background such as the sky;
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