I am very nearsighted causing distant objects to appear blurry!
So am I!!! Do you wear glasses?
I do.  The underlying cause is believed to be a combination of genetic and environmental facts.  I have 3 siblings who also wear glasses for nearsightedness.
That makes sense.  When was this discovered?
I'm not certain but nearsightedness also increases the risk of retinal detachment, cataracts and glaucoma.