Later Last Evening I Experienced Flashes Of Light In An

later last evening I experienced flashes of light in an arch shape around the top outer side of my right eye. Today after waking, I seemed to notice darker spots (floaters?) in the same eye but until it started to get darker outside or until I walked into a darker area of my home and then noticed the flashing again. My left eye seems fine but earlier today it felt different. No flashing or new floaters in the left eye. My right eye feels somewhat strained. Can you tell me what this is from please?