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Vision is different from touch.

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If you look at something, say a beach ball, the image falls on both sides of our retina

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and will go to both sides of the brain.

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But there is a crossing and it has to do with the fact that our retinas are divided where they send information to the brain.

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Start by imagining that you are looking at the plus sign.

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Anything presented to the right visual field, in this case the banana

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falls on the left half of the retina in both eyes and is passed to the left hemisphere.

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Inversely, anything presented to the left visual field, for example a beach ball

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is passed to the right hemisphere because it falls on the right half of the retina.

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Thus, your left hemisphere “sees” only the right half of the world

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and your right hemisphere “sees” only the left half of the world.