Does your son have diabetes mellitus?
Does he have other neurologic symptoms such as focal weakness/numbness in his face or any limb? Bowel or bladder incontinence?
Does his blurry vision get worse when he gets hot (exercises or has a hot shower)?
What other medical problems does your son have?
Central apnea, in and of itself, is not associated with any particular vision or eye problem. Some causes of central apnea can be the cause of bilateral optic nerve swelling (damage to breathing centers in the brain from tumors, stroke or infection), and certain types of brain malformations (Arnold-Chiari).
Diabetes can cause a unilateral optic nerve swelling, but without history of this, it is unlikely.
I'm sorry that I cannot give you a positive association between this condition and your sons optic nerve swelling.
Does that help answer your question, however?
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My opinion is solely informative and does not constitute an informed medical opinion or recommendation. For an informed medical opinion and/or recommendation you must see an eye doctor.