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The research team used human embryonic stem cells to grow retinal cells on a thin plastic scaffold and then transplanted the "engineered tissue" into two sufferers of age-related macular degeneration who can now read again, albeit slowly

Scientists Create First 3D-Printed Human Corneas

Newcastle University scientists have created the first 3D-printed human corneas using a combination of human cells, alginate, and collagen, potentially creating an “unlimited supply” of corneas to treat blindness for millions of people.