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.
An A-scan may be compared and contrasted with a B-scan , in which the eye is examined in cross-section using a high-frequency ultrasound machine.
More about Ophthalmology:
This section includes short definitions
of many diseases, disorders, and conditions of the eyes and visual system.
For definitions of other terms in this category, choose from the list to the left (but note that this is not a complete/exhaustive list).
Other related pages include
- A diagram of the eye
- Definitions and descriptions of the parts of the eye
- A concise description of the human retina
- Definitions of parts of the retina
- Diseases and disorders of the human eye and the human visual system
For further information see also our pages of books about ophthalmology.