IHAD A MINOR ACCIDENT AT HOME , ASTONE OF 5MM SIZE HIT MY LEFT EYE. DR CHECKED AND NO DAMAGE FOUND. AFTER FEW DAYS SOME SORT OF FLASH LIGHTS APPEAR FROM THE SIDE OF MY LEFT EYE, I CHEKED WITH DR AGAIN, HE CHECKED FOR ANY DAMAGE OR TEAR RATINA HE CONFIRMED NO DAMAGE, PLEASE ADVISE WHAT IS THIS PROBLEM OF FLASH LIGHTS APPEARING FREQUENTLY .