in floaters, flashing lights, or the sensation of a dark curtain or shadow moving across part of your vision can be a warning sign of a retinal tear or retinal detachment.
This is an eye emergency because rapid treatment may be necessary to protect vision.
Seek urgent eye care if you suddenly develop:
Many new floaters
Repeated flashes of light
A dark shadow in your visual field
A curtain-like loss of vision
Eye Changes Can Be Clues, Not Diagnoses
Your eyes can sometimes provide useful clues about conditions such as
