This is personified as 'eyes looking at the truth will give birth to Buddha', and further as 'divinity of the universe to make a person look at the truth to reborn as a Buddha', which were further developed into worship of Buddha's eyes that symbolize the mother of Buddha.
これを「真理を見つめる眼が仏を産む」更に「人に真理を見せて仏として生まれ変わらせる宇宙の神性」という様に擬人化して考え、仏母即ち「仏の母」としての仏眼信仰に発展した。