ok, first of all 你 should learn what ocular albinism is when the eyes lack in pigment often causing them to be blue. it can also impair vision 由 causing someone to be near 或者 far sighted, and/or not be able to focus correctly on something.
hints of ocular albinism in Simon.
Simon shows a lesser pigment in eye coloring (his eyes are blue)
he also has glasses 展示 that he can not focus well on stuff
he may be farsighted because in the 移动 (Alvin and the chipmunks) Dave holds up 2 fingers and asks Simon to count them. he gos to guess 5 times before choosing 6.