I have severe nearsightedness and I know the primary cause is because my eyeball is too long...?

So my question is why is it that my eyeball is long?
does it grow that way because the eyeball adapts to seeing
things up close...?
was I born that way?
is it due to genetics?
or does is grow that way because of some lack of nutrition?
why is it that my eyeball has grown long?

http://health.yahoo.com/ency/healthwise/...

this link will give you a little more information on your condition. I have nearsightedness as well as an astigmatism in both eyes. I'm blind as a bat without my contacts. but remember, there's always lasik surgery. Im hoping to get it in a few years.

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