Which term describes the perception of light originating from within the human eye itself?

The term that appropriately describes the perception of light originating from within the human eye itself is "entoptic phenomenon." This concept refers to visual effects that occur within the eye and can include various visual occurrences such as seeing floaters, the blue field phenomenon, or the phosphenes that might be experienced when pressure is applied to the eyes.

Entoptic phenomena are of particular interest because they provide insights into the functioning of the visual system, emanating from internal structures rather than external light sources. This contrasts with perceptions generated from external stimuli, which would not be categorized as entoptic. Thus, understanding entoptic phenomena is crucial for visual perception as they illustrate how our visual system operates beyond just responding to light from the environment.