• The DORC Vitrectomy Lens System provides the vitreoretinal surgeon with the most versatile and complete solution for visualization in every surgical case. A unique self-retaining silicone ring is the primary fixation method, making the DORC. lens system convenient and efficient. Available in WideView and Disposable styles, with a wide range of visualization geometries. With the option of using a sutured scleral ring for select cases, DORC. lens systems provide complete versatility to surgeons and O.R. staff.