• The functional success of a Jones Pyrex tube depends on the accurate positioning of the tube. The modified trephining technique for the insertion of a Jones tube ensures accurate positioning by using a guide wire to maintain the selected position and direction of the tube while a 1.5-mm-diameter trephine cuts a cylindrical track around the guide wire, down which a straight Pyrex tube is threaded. The snug fit between the tube and the trephined track has minimized postoperative extrusion (5%) and migration (7%). This technique has been used to insert 93 tubes in 84 patients aged 7 to 83 years.
Henderson PN. A Modified Trephining Technique for the Insertion of Jones Tube. Arch Ophthalmol. 1985;103(10):1582-1585. doi:10.1001/archopht.1985.01050100158041