I'm sorry about your son's unfortunate condition. As a parent, I can only imagine what angst you must be going through. The damage to your son's optic nerve (hypoplasia) is an in utero event, meaning that the insult to the optic nerves happened once, while in your uterus, and is not an ongoing scenario. Because of that, I would not expect his vision to worsen from this. It may be that his combination of aging and hearing loss has turned his attentions elsewhere to the point that he is not as interested in the guitar playing as he once may have. In addition, while I would not expect it to make much of a difference, there is a chance that he has developed a refractive error (need for glasses), that may help the vision, if needed, in the event that the baseline vision potential is not overly poor. But I do not expect this to be a progressive vision loss from optic nerve hypoplasia.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.