What are entoptic phenomena in transient vision loss (TVL)?

Updated: May 21, 2019
  • Author: Andrew J Tatham, MD, MBA, FRCOphth, FEBO, FRCS(Ed); Chief Editor: Andrew G Lee, MD  more...
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Answer

Answer

Entopic phenomena are images produced by the eye’s own structures. These images may occur in the normal eye or may reflect abnormalities of ocular structures. Examples of entopic phenomena include the following:

  • Floaters: These may be due to posterior vitreous detachment, vitreous hemorrhage, or the normal vitreous.
  • Phosphenes: These are luminous sensations that may be induced by mechanical distortion of the retina resulting from eye rubbing or saccadic eye movements. [7]
  • After-images: These are persistent images that remain after an object in the visual field is removed; this is a normal sensation that depends on the intensity and duration of the stimulus.

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