ULtrasonographic measurement of the components of ocular refraction in life: 2. Clinical procedures: Ultrasonographic measurements compared with phakometric measurements in a series of 140 eyes

Abstract (1) Ultrasonography was used for measuring the components of refraction in 140 eyes: the results obtained were controlled by direct visual phakometry in fifty-six eyes and by photographic phakometry in eighty-four eyes. (2) There was close agreement in the results obtained by ultrasonographic and phakometric methods. The mean difference in the values for the anterior chamber was +0.202 mm ± 0.28, for the thickness of the lens +0.099 mm ± 0.20 and for axial length −0.027 mm ± 0.31. (3) The power of the lens referred to the corneal vertex also agreed fairly closely, the mean difference being +0.051 D ± 0.70. (4)Ultrasonography has proved a quick and easy clinical procedure for measuring the major optical components.