How to modify the human eye to see into the ultraviolet and infrared bands?

If I'm writing a sci-fi story and I wanted to include humans with modified eyesight that see into the ultraviolet and infrared bands of the electromagnetic spectrum, what would I have to change about my character's eyes?

If they only see infrared or ultraviolet light, what would things in the visible electromagnetic spectrum look like?

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How to modify the human eye to see into the ultraviolet and infrared bands?

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