where does the eye for an eye come from
Eye for an eye First referenced in the Code of Hammurabi, (which predates the Hebrew bible.) In the Hebrew Law, the "eye for eye" was to restrict compensation to the value of the loss. Thus, it might be better read 'only one eye for one eye'.[3] The biblical phrase "an eye for an eye" in Exodus and Leviticus (עין תחת עין‬, ayin tachat ayin) literally means 'an eye in place of an eye' while a slightly different phrase (עַיִן בְּעַיִן שֵׁן בְּשֵׁן, literally "eye for an eye; tooth for a tooth") is used in another passage (in Deuteronomy) of the Hebrew Bible, specifically, in the first of its three subdivisions, the Torah.[9][10][11] For example, a passage in Leviticus states, "And a man who injures his countryman – as he has done, so it shall be done to him [namely,] fracture for fracture, eye for eye, tooth for tooth. Just as he has injured a person, so it shall be done to him." (Lev. 24:19–21)[9]
Cornea The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power.[1][2] In humans, the refractive power of the cornea is approximately 43 dioptres.[3] While the cornea contributes most of the eye's focusing power, its focus is fixed. The curvature of the lens, on the other hand, can be adjusted to "tune" the focus depending upon the object's distance. Medical terms related to the cornea often start with the prefix "kerat-" from the Greek word κέρας, horn.