It's a difficult taste to sacrifice just that one valuable thing you have. It takes a lot of effort checking the pros and cons.Just imagine an old woman bending or holding onto one thing and the other to move, then suddenly going blind.
The things you can easily get done will be difficult, like bathing yourself, going to the toilet, and making a call. I'm just imagining my 85 year old auntie, who I take care of, going blind. The workload will be too much; she is now dependent on people for those few things she can easily do for herself.
Remember, someone is taking care of her; how do you think the other person will feel? It is a busy world where everyone will like to make the most out of life and enjoy life as much as they can without any restrictions. Just imagine staying with an old blind woman for a whole week.
It's not a day job, and not everyone will be willing to do that kind of job. It's surely going to be a difficult task for whoever is helping her out, and she might have to consider it before she sacrifices her eyes for a baby.
Furthermore, old age might be full of regret, or it might be full of peace. You wished you might have done something different, changed some decisions, and all. Old age is purely a time of loneliness, with no friends or occasionally visiting friends; family gets busy, and you might actually feel abandoned, and then imagine having to get blind and not being able to see your grandchildren and great-grandchildren.
Old people always want to have company around, someone staying around them, laughing with them, joking with them, but it's not everyone who has the time to do that on their free will unless they have been paid for it. It's truly a difficult decision to make, but then there are so many reasons to say no. I don't even know this child in question.
For me, I would be selfish not to give out my eyes for this baby; I can't tell what life is in store for me. What if my children want to take me on a vacation to see beautiful places? What if my granddaughter wants to get married? How will I be able to see her in her beautiful wedding dress? How will I be able to see the beautiful places? The sunrise. The person taking care of me.