"A refractive error
However, if your cornea or lens isn't evenly and smoothly curved, light rays aren't refracted properly, and you have a refractive error. Nearsightedness is one type of refractive error. Nearsightedness can occur when your cornea is curved too much or when your eye is longer than normal. Instead of being focused precisely on your retina, light is focused in front of your retina, resulting in a blurry appearance for distant objects."
It doesn't even make sense. How could the cornea and lens be at fault for the eyeball being too long?
Clearly the eyeball being too long is more likely the "cause" than the cornea and lens!
The cornea and lens might be perfectly round but there will be blurry vision if the eyeball is elongated.
Could it be because people would understand that the reason the eyeball is elongated is because of the muscles squeezing it?