Dislocation of Lens-Diagnosis by Ultrasonography

To the Editor:—  The first diagnostic uses of ultrasonography in ophthalmology were described by Mundt and Hughes in 1956¹ and Oksala in 1957.² Ultrasound has since been shown to be useful, diagnostically, in determining the axial length of the globe, localizing intraocular foreign bodies, and in identifying various intraocular and retrobulbar lesions.The history, theory, and techniques of ocular ultrasonography have been reviewed.³ Oksala first showed the value of ultrasound in the diagnosis of a posteriorly luxated lens⁴ and explored the effects of the lens on the ultrasound field; these included dispersion, higher absorption, and higher velocity than the surrounding ocular structures.⁵ He also demonstrated that multiple echoes may arise from a cataractous lens.⁶However, the ultrasonic diagnosis of anterior lens dislocation has not previously been reported. This may be of use when a cloudy cornea or anterior chamber make visual diagnosis difficult. This