The eyes are a major organ in Humans similar to every other organism. It has a highly complex structural orientation which produces a sense of vision. It has complex receptors of light that can gather the surroundings and convert them into electrical signals/nerve impulses, which the brain processes and interprets to produce vision. Humans have binocular vision. It is the method by which both eyes can produce a single enlarged and wide image.

GLP is a formal regulation created by the USFDA as these regulations were proposed on November 19, 1976, and designated as a new part of Chapter 21 of the Code of Federal Regulations (CFR) as 21 CFR Part 58 in 1979. In 1981 an organization named OECD (Organization for Economic Cooperation and Development) produced GLP principles that are international standards.

With the advancement of stem cell technology and 3D printing, researchers at the University of Oxford developed a 3D printing method for the purpose of repairing brain injuries. It was initially tested in mouse brain fragments, to this the implant was attached. These implants then got integrated with the mouse brain fragments. This newly developed technology can be used for curing lethal brain injuries.