Science and Education Publishing American Journal of Medical Case Reports 2374-216X 4 6 2016 7 8 Large Non-traumatic Iris Cyst 218 220 EN Gan Yuen Keat Ophthalmology Department, Hospital Queen Elizabeth, Kota Kinabalu, Malaysia Syed Shoeb Ahmad Suresh Subramanian Shuaibah Abdul Ghani Amir Samsudin AJMCR2016469 10.12691/ajmcr-4-6-9 2016 3 7 2016 5 29 2016 7 6 Iris cysts are uncommon ocular pathologies and their surgical excision is often difficult owing to their location and fragile nature. Herein, we report a patient who complained of progressive, painless blurring of vision in the left eye for six months. On examination, a large smooth non-transilluminant iris mass was seen extending from 11 o'clock to 5 o'clock region and touching the corneal endothelium. Surgical excision was performed and the patient's vision improved from HM to 6/48.