Measurements of the globe were made at different stages of accommodation with Kretz A-mode ultrasonic equipment. A comparison between the movement of the crystalline lens in two refractive groups appeared to show that the highly myopic lens had to expand more per dioptre of accommodation; in other words, it was less efficient than the near-emmetropic lens. Also the posterior surface of the lens appeared to move more in highly myopic eyes than in near-emmetropic eyes.

SUMMARY Three patients with transient myopia following blunt injury are described with the aid of serial ultrasonography. The cause of refractive change is an increase in the anteroposterior thickness of the crystalline lens, which probably results from oedema of the ciliary body.

Measurements of the globe were made at different stages of accommodation with Kretz A-mode ultrasonic equipment. A comparison between the movement of the crystalline lens in two refractive groups appeared to show that the highly myopic lens had to expand more per dioptre of accommodation; in other words, it was less efficient than the near-emmetropic lens. Also the posterior surface of the lens appeared to move more in highly myopic eyes than in near-emmetropic eyes.