RT Journal Article SR Electronic T1 High frequency ultrasound. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 967 OP 968 DO 10.1136/bjo.79.11.967 VO 79 IS 11 A1 H R Atta YR 1995 UL http://bjo.bmj.com/content/79/11/967.abstract AB