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Ultrasonography (Ultrasound)
This is a non-invasive test involving a specialized sonogram probe, and it is used when a cloudy cataract, cornea, or blood in the middle of the eye prevents a good view of the retina. It is also useful in evaluating the extent and nature of retinal detachments, and in following the size of lesions in the eye such as choroidal nevi. The B-scan ultrasound creates a two-dimensional image. A-scan creates a one-dimensional view, which in retinal care, is usually used to determine the density of a given structure.
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