which Holy Rabbi was already very old, blind in one eye and still refused to go to a certain event for fear of seeing something improper?

You're asking about Rabbi Avigdor Miller, zecher tzaddik livracha. He was already past 90 years old and blind in one eye, yet he still refused to attend a certain event - specifically a celebration that was going to have mixed dancing or inappropriate mingling between men and women. When his student came to him and said, "Rebbe, it's just a wedding, it's my cousin, what's the problem?" Rabbi Avigdor Miller responded firmly: "In that case, you should go see a doctor because obviously you're not feeling well. I'm already past 90 years old and blind in one eye, and I know that such sights would affect me. And you are so sure that it won't affect you?" This is the level of yirat Shamayim and kedusha we're talking about. He understood human nature. There is no such thing as "it's not going to affect me." There is no such reality as achieving holiness without fear of the Almighty, without being afraid of sinning, without aspiring to be the holiest you could possibly be when it comes to issues of tzniut and morality. Even at his advanced age and with his physical limitations, he would not compromise on protecting his eyes and his neshama from anything improper.