I need some health questions answered!?!


Question: I need some health questions answered!!?
Can you please answer as many of these questions as you know keeping it truthful and scientific please!. THANKS!


* Why do some people need glasses!? How do glasses improve vision!?
* What causes nearsightedness!? How is it different from farsightedness!?
* How does corrective laser eye surgery work!? How does it improve vision!? What risks are involved!?
* Why are some people colorblind!?
* How do optical illusions work!? How do they
Answers:
Refractive errors occur when the eye is not able to correctly focus images on the retina!. The result is blurred vision, which is sometimes so severe that it creates functional blindness for affected individuals!.

The three most common refractive errors are:

Myopia (nearsightedness)



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