Just my observation regarding a recent hmm what should I call it? I know, lets say spectacle. About 70% of persons over 60 years old can have what is known as “dry eye syndrome” (not that I know from personal opinion. I am what is called a distant 40 at best. Shut up!). A person living with this can also find that it worsens in bright light (lets say the sun or perhaps stage lighting), causing rapid blinking. But in the case of bright stage lighting, constant sniffing, thirst, arrogance, ignorance or narcissistic tendencies never have been known to occur.