I’m pretty sure they included more than one independent variable.
B. astigmatism is the best answer, it definitely gives distorted images.
Nearsightedness is where you can't see things clearly unless they are really close up to the eyes. Farsightedness is where you can see things better the farther off, but both of those may still leave you seeing blurry. Sclera is just part of they eyeball, the outer white layer.
Answer:
He hasn't hit puberty
Explanation:
When you hit puberty your voice gets deeper and things change
