Hello Unless it is macular hole,you wont know for sure about retinal hole. Retinal hole in peripheral retina does not have any symptoms.dilated eye examination is necessary

Hi....You can be aware of triggers or symptoms which is flashes, sudden floaters or increase in floaters, curtain like thing in front of eyes or decrease in vision ... Hole is a diagnosis made by doctor after examining you ...patient cannot make it. So just see a doc in case these things happen ..doc will tell u the reason after exam Take care..all the best

In one sentence, the answer would be no one can know with certainty unless it is carefully seen inside the eye by the doctor. Flashes can be there due to many retinal diseases, but with as such there is no particular feature of a flash due to a retinal hole. Whenever you see a flash... You need to get your retina checked.