Is his skin almost transparent? Light hair, lashes and almost or no body hair? Read this here.
Blonde fundus is describing the amount of pigment in the fundus. It is common in caucasions. It is on no concern.
This means he will probably need to take good care of his eyes by wearing sun glasses, since he lacks pigmentation in the fundus . The fundus of the eye is the interior surface of the eye, opposite the lens, and includes the retina, optic disc, macula and fovea, and posterior pole.
Blonde fundus can also be cause for poor vision, something that can be remediated.