So I understand we see things because light is reflecting off an object and that light is hitting our eye. It gets focused by our eye onto our retina. So it makes sense to me how someone can have bad eyesight, where everything goes equally out of focus. But how can a person be near-sighted, where light travelling a shorter distance (ie reflected from a closer object) is in focus but light travelling a farther distance is not in focus? And the reverse for far-sighted? How does the distance the light is traveling affect whether it can be in focus? It seems to me like everything should be able to be equally in focus, or equally out of focus
In: Biology
Your eyes does not get light only through a tiny point but through the entire pupil. The light from an object that hits the left side of your pupil comes inn at a different angle then the light from the same object that hits the right side of your pupil. The difference in angle depends on how far that object is from you. So depending on how far it is you need to adjust your lens differently so that the light that hits either side of your pupil hits the retina in the same spot.
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