Question

What is the only human tissue that doesn't require blood?

Answer 1

cornea in human eye is the only human tissue that doesn't require blood

Answer 2

There is no such tissue. But there are some parts of tissue that does not require blood like cornea of eye,nails,hairs,tooth enamel and outer skin layers.
And if you are talking about unvascularised tissue then the answer is epithelial tissue.