Around the age of 77 years old, Joe Biden's eyes suddenly chnaged from very blue to brown.
I've mentioned this to people and they just shrug their shoulders and say "must be eye cintacts."
So all if his 77 years of life he was happy with bright blue eye and as he's approaching 80 he thinks "brown is better." So he buys brown contacts and never skips a day going back to blue.
Have you ever heard of such a thing before?
I've worked in the ophthalmic lens industry on optical quality control of intraocular lenses, having published 3 papers on the subject. I've had to study the optical system of the eye. I would have to see much more than is presented in this venture-investment website advertisement to even think this is feasible. The eye does not focus on images occurring at the surface of the cornea.
It is safe to say that Biden has nothing like this.
Simpler explanation: the brown contact lens is used to cover over Biden's highly dilated eyes, from the use of psychotropic drugs to keep him functional.