Spots before the eyes

• flashing lights
  • is due to vitreoretinal traction causing mechanical stimulation of the retina
  • these include:
    • photopsias (1)
      • visual images that do not correspond to environmental objects
    • phoshenes (2)
      • sensation of flashing lights from sources other than external light stimulation to retina
• light flashes is a symptom which is associated with many conditions, including:
  • retinal detachment
  • posterior vitreous detachment
  • optic neuritis
  • migraine
  • postural hypotension (2)
  • vasovagal reactions (2)
  • transient ischemic attack (2)
• acute posterior vitreous detachment is the most common cause of sudden-onset flashes and floaters (1)

Reference:

• (1) Margo et al. Posterior vitreous detachment, how to approach sudden-onset floaters and flashing lights. Post Grad Med 2005; 117 (3)
• (2) Gariano RF et al. Evaluation and management of suspected retinal detachment. American Academy of Family Physicians 2004.