According to the records in Buddhist Scripture, one disciple of Ananda wished to learn Heavenly Vision. Ananda taught him, yet after the disciple mastered Heavenly Vision, he strayed from the Buddhist Path and entered the Demon Path, which had an extremely detrimental impact.
Because of this incident, Buddhist sects almost erased the methods for cultivating Divine Skills from their scriptures; thus, contemporary Buddhist Scriptures contain only Buddhist teachings, with no methods for cultivating Divine Skills.
Hence, regarding the cultivation of eyes, the Buddhist scriptures only provide a simple introduction and lack detailed cultivation techniques.
Among the Five Eyes Divine Power, the Physical Eye refers to a person's ordinary eyes, which can see very limited things and cannot see through all material objects. The visual distance is also very short. Through cultivation, one's vision becomes better than that of an ordinary person, seeing farther and clearer.