One of the earliest texts on the human eye was written in the ninth century by Arab doctor Hunyan ibn Ishaq (809-873 CE). According to him, how did the eye function?

Answer: All individual components of the eye had their own nature, arranged in a way to ensure cosmological harmony. Ishaq argued that this reflected the mind of God.

Source: Theories of Vision from al-Kindi to Kepler by David Lindberg

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