A-Scan is a shortened term that refers
to an "A-scan ultrasound biometry".
An A-scan (or A-scan ultrasound biometry)
is a routine diagnostic test used in ophthalmology.
It involves examination of the tissues of the eye including the axial
length (of the eye), using a high-frequency ultrasound technique.
This may be compared and contrasted with a B-scan
(in which the eye is examined in cross-section using a high-frequency
ultrasound machine).
This section includes short definitions of clinical and surgical procedures
concerning the eyes and human visual system. For definitions of other
terms in this category, choose from the list to the left.
Other related pages include the diagram
of the eye, and definitions
of parts of the eye, a description
of the human retina, and the section about disorders
of the eye and visual system.
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