To understand what they are being asked to observe or their inability Particular image can be useful, the inability to visualize an image isĭifficult to interpret and may simply reflect the patient's failure Although a precise report of the visualization of a However, it is important toĪlways remember that subjective descriptions of these phenomena are notoriously The size of the foveal avascular zone, estimate leukocyte velocity, and Has been used to demonstrate the position of an opacity in the eye, measure The pathophysiology of various ocular disorders, and they also provideĪ means to subjectively confirm objective findings. Entoptic phenomena have been used to study Many of the entoptic phenomena he first described.ĭespite the fact that our understanding of the optical and physiologicīases of specific entoptic images remains inexact, these phenomena canīe useful clinical tools. Because of their depth and breadth, Purkinje's studiesĪre especially notable, and his name has become associated with Many distinguished scientists (including Aristotle, Descartes, Helmholtz, andĮdison) have contributed to our understanding of entoptic In addition, the direct attentionĪnd cooperation of the observer is a critical factor for the perception Illumination or other types of stimulation are required to adequatelyĬreate and maintain these images. They are produced by objects in real space. Of normal imaging in the external world, they may be perceived as if Phenomena may result from either normal anatomic components of the eye The external environment by the refracting system of the eye. System that are not the customary result of forming an optical image of Influenced by the native structures of one's own eye or visual In the most generallyĪccepted context, the term describes the visual sensations produced or Within vision,” refers to the visual sensations that ariseįrom causes within the eye or visual system. The term entoptic phenomena, derived from the Greek for “things perceived ENTOPTIC IMAGERY AND AFTERIMAGES Chapter 20ĮNTOPTIC PHENOMENA ASSOCIATED WITH PROPERTIES OF THE OCULAR MEDIAĮNTOPTIC PHENOMENA DEPENDENT ON THE STRUCTURE AND PHYSIOLOGIC PROPERTIES OF THE RETINA AND VISUAL PATHWAYSĭIRECTIONAL SENSITIVITY OF PHOTORECEPTORSĮNTOPTIC VISUALIZATIONS ASSOCIATED WITH NEURAL ADAPTATION
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |