They brought a relative. Grandfather is 80 years old. Hears badly. He walks with a hearing aid (which, in general, is not news at his age). The device, by the way, Philips, if that. Bought in St. Petersburg ... But now - not about that. Grandfather was brought with terrible glaucoma and cataracts in both eyes. In this regard, it is almost completely blind. That is, on one eye - completely, even the nerve has already died. Vision - 0. And on the second there are still 10%.