Dr Masselos performs both glaucoma and cataract surgery, and has completed a fellowship in glaucoma at the Manchester Royal Eye Hospital in the United Kingdom. Dr Masselos works in private practice in Sydney and is a staff specialist at Prince of Wales and Sydney Eye Hospitals. She works with the Outback Eye Service to provide eye care to residents of Broken Hill and surrounding regions. Dr Masselos is also a lecturer at the University of New South Wales.