The high frequency technique is called ultrasound biomicroscopy, or UBM. Several equipment manufacturers offer photos of the images their devices can produce.
Silverman RH, “High-resolution ultrasound imaging of the eye – a review”, Clin Experiment Ophthalmol. 2009 Jan; 37(1): 54-67.
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Linda Fugate is a scientist and writer in Austin, Texas. She has a Ph.D. in Physics and an M.S. in Macromolecular Science and Engineering. Her background includes academic and industrial research in materials science. She currently writes song lyrics and health articles.