1. Binkhorst RD (1981) The accuracy of ultrasonic measurement of the axial length of the eye. Ophthalmic Surg 12: 363–5
2. Schachar RA, Levy NS, Bonney RC (1980) Accuracy of intraocular lens powers calculated from A-scan biometry with the Echo-Oculometer. Ophthalmic Surg 11: 856–8
3. Olsen T (1989) The accuracy of ultrasonic determination of axial length in pseudophakic eyes. Acta Ophthalmol (Copenh) 67: 141–4
4. Bamber J, Trstam M (1988) Diagnostic ultrasound. In: Webb S (ed) The physics of medical imaging. Bristol and Philadelphia: Adam Hilger, pp. 319–388
5. Learning DV (1998) Practice styles and preferences of ASCRS members-1997 survey. J Cataract Refract Surg 24: 552–61