Is it permissible to drink Zamzam water with the intention of strengthening one's eyesight for a person who suffers from severe vision impairment and can only see from up close?

It is permissible for a Muslim to drink Zamzam water and to wash with it with the intention of healing and bodily health, due to the saying of the Prophet, peace and blessings be upon him: "Zamzam water is for what it is drunk for," and his saying: "Indeed, it is blessed; indeed, it is satisfying food and a cure for illness." Therefore, there is no objection to using it with the intention of healing from weak eyesight and other ailments.