<p style='text-align: justify;'>Passage from ʿAlī ibn ʿĪsā, Taḏkirat al-kaḥḥālīn (‘Memorandum for opticians’), including the end of chapter 5 and the beginning of chapter 6, on the anatomy of the different layers of the eye (ed. Hyderabad 1964, pp. 13-14).</p>