As far as I know they do. See here https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon Bu

As far as I know they do. See here https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon But I see it everywhere and probably far more pronounced than what is described in the article.