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M.D. Asistant Professor, Ahi Evran University Faculty of Medicine, Department of Ophthalmology, Kırsehir/TURKEY The use of single-use material for cataract surgery with the phacoemulsification (PE) method is constantly increasing. The reuse of single-use material following sterilization can cause many problems, including loss of vision. The sterilization of single-use material has been forbidden by the Ministry of Health in our country and relevant notifications have been sent to healthcare providers. We report snail-track deposits at the back surface of the intraocular lens (IOL) that caused visual problems following the sterilization by ethylene oxide and reuse of an IOL cartridge in two cases. We postulate the deposits that caused symptoms of postoperative blurred vision and glare in both cases were residue of the viscoelastic substance that had undergone denaturation. Single-use material should only be used once to avoid such problems. Keywords : Phacoemulsification surgery, ıntraocular lens, cartridge, viscoelastic, disposable material