Optic nerve, a nerve that carries signals from the retina to the brain, Farsightedness , A vision problem when an object from far away is clear but when it near it’s blurry , Nearsightedness , A vision problem when an object is near its clear but when is far away it’s blurry, Astigmatism , A vision problem when everything is blurry in all distances , Concave lens, a curved piece of transparent material that is thinner in the middle than at the edges, Convex , a curved piece of transparent material that is thicker in the middle than at the edges, Retina, an area at the back of the eye that turns light into electrical signals for the brain to understand.

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