what causes people to have lazy eyes?!

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Wow, the other person gave you a really technical answer!(:

I have amblyopia (lazy eye) and myopia (essentially nearsighted) and I can't see out of that eye (left). Basically what causes it is something in the brain that just doesn't click, literally. It's like turned off the nerve senses in my brain that are linked to my eye. They just... don't work. It's not *that* bad, actually. I like having it... (:

Anything that interferes with clear vision in either eye during the critical period (birth to 6 years of age) can cause amblyopia. The most common causes of amblyopia are constant strabismus (constant turn of one eye), anisometropia (different vision/prescriptions in each eye), and/or blockage of an eye due to cataract, trauma, lid droop, etc.

Amblyopia is a neurologically active process. In other words, the loss of vision takes place in the brain. If one eye sees clearly and the other sees a blur, the brain can inhibit (block, ignore, suppress) the eye with the blur. The brain can also suppress one eye to avoid double vision. The inhibition process (suppression) can result in a permanent decrease in the vision in the blurry eye that can not be corrected with glasses, lenses, or lasik surgery.

http://www.lazyeye.org/#causes