[necovek]

It seems to me they've brought up myopia only to make it more approachable to people how blurry something is, implying they believe models work with a blurry image just like a nearsighted person sees blurry images at a distance.

While myopia is common, it's not the best choice of analogy and "blurry vision" is probably clear enough.

Still, I'd only see it as a bad choice of analogy — I can't imagine anyone mistaking optical focus problems for static image processing problems — so in the usual HN recommendation, I'd treat their example in the most favourable sense.