| Era: | Islamic golden age |
| Aayon Ibn Aayon | |
| Native Name: | أعين بن أعين |
| Other Names: | Ibn Aayon |
| Native Name Lang: | Arabic |
| Birth Place: | Kairouan |
| Death Date: | December 995 |
| Death Place: | Cairo, Egypt |
| Occupation: | ophthalmologist |
Aayon Ibn Aayon (ar|أعين بن أعين) (died on Dhu al-Qadah 385 AH/December 995 AD), known as Ibn Aayon, was an Arab Muslim kahhal (ophthalmologist) during the period of medieval Islam. He moved from Kairouan to Egypt with Al-Mu'izz li-Din Allah,[1] and he was known in Egypt during the caliphate of Al-Aziz Billah. His most notable work is Of eye diseases and their treatment (ar|في أمراض العين ومداواتها).[2] Ibn Aayon was mentioned on Uyūn ul-Anbāʾ fī Ṭabaqāt al-Aṭibbā (ar|عيون الأنباء في طبقات الأطباء), a book written by Ibn Abi Usaibia.[3]