Maybe I am having paranoid, but I still wish to have a logical solution to my concern.
I almost always keep my eyes looking at the ground whenever there is lightning and thunder, I don’t know how strong the flash is.
I’d like to know, if I look up to the sky while there is a lightning flash, is the intensity of flash bad enough to cause any permanent or accumulated adverse effect to our eyes?
In contrary, I am not too worried about lightning strike because I am living in a densely populated city where are too many tall buildings. I am more concerned about my eye health.