Hoton da ke ƙasa yana nuna yadda ido ke aiki. Kamar yadda kuka sani, a saman idanunmu akwai kwayoyin halitta masu siffar mazugi (cone cells) a yankin retina waɗanda ke karɓar haske, sa’an nan su canza hasken zuwa sigina na wutar lantarki sannan su aika zuwa kwakwalwa ta hanyar jijiyar gani (optic nerve). Kwakwalwa tana nazarin waɗannan sigina na wutar lantarki, sannan ta hanyar nazarin bayanan ta yi nasarar ganin abubuwa, watau tana canza sigina na wutar lantarki zuwa hoto.[*]
A cikin Surah Al-An’am (6:103) an rubuta:
Idanu ba za su iya riskarSa ba, amma Shi yana riskar dukan idanu, kuma Shi ne Mai ladabi, Masani.
Kamar yadda kuka gani, Allah Ya yi amfani da kalmar “idraak” (riskawa/fahimta) ga idanu. A bayyane yake cewa abin da kawai yake gani bai isa ba; dole ne a binciki wannan bayanin gani a cikin kwakwalwa ko “a fahimce shi” – ko kuma kamar yadda Alƙur’ani ya yi amfani da kalmar “tudrikuhu”. Yin amfani da wannan kalma ba saboda komai ba ne, domin shekaru 1400 da suka wuce, musamman al’ummar Larabawa na wancan lokacin ba su da ilimin cewa kwakwalwa ce ke nazarin bayanan gani. Idan Alƙur’ani aikin ɗan adam ne na yau da kullum, da an rubuta kawai “idanu ba za su gan Shi ba”. A cikin wannan ayar akwai nuni mai zurfi da gaskiya game da ainihin yadda ido yake aiki.
[*] Yadda Idon Dan Adam Yake Aiki

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