[The two-way syringe. A comparison to modified aspiration methods in cataract surgery, and more recent indications for its use (author's transl)].

After description of construction, indication, and application of the two-way syringe in cataract surgery, this instrument is compared to some of its numerous modfications. The original device has the advantage of simplicity, and enables the surgeon to perform simultaneous irrigation and aspiration under zero pressure conditions without an assistant. More recent indications for the use of the two-way syringe are vitreous prolapse, and retinal detachment. These operations are described in detail.