Flashes of lights, floaters and darkening of the peripheral vision are symptoms of retinal tears and detachments, two of the most common retinal issues, as reported by WebMD. These symptoms can vary in severity and need an eye doctor's immediate medical attention.
Retinal tears are the precursor to a retinal detachment. When the retina tears, fluid from within the eye can pass through the tear and completely detach the retina from the back of the eye. If this occurs, a patient may need an operation in order to re-attach his retina and fully restore his eyesight, as stated by WebMD.