<p style='text-align: justify;'>Passage from ʿAlī ibn ʿĪsā, Taḏkirat al-kaḥḥālīn (‘Memorandum for opticians’), first discourse, chapter 11 on meninges and on the formation of the choroid of the eye; beginning of chapter 12 on the sclera of the eye (ed. Hyderabad 1964, pp. 22-24).</p>