Surgical, medical and veterinary instruments and apparatus, in particular injection apparatus for intraocular lens implants, as well as cartridges and pistons for injection apparatus for intraocular lens implants; intraocular lens implants; injection apparatus for ocular implants, as well as cartridges and pistons for injection apparatus for ocular implants; corneal implants and crystalline lens implants; irrigation and aspiration instruments; cannulas for disintegrating and aspirating the natural crystalline lens of the eye; irrigation and aspiration cannulas, cannulas for introducing instruments into the eye; instruments for the surgical treatment of cataract diseases.