A-scan ultrasound biometry

A-scan ultrasound biometry, commonly referred to as an A-scan, is routine type of diagnostic test used in ophthalmology. The A-scan provides data on the shape of the eye, which is a major determinant in common sight disorders. Instruments used in this type of test require direct contact with the cornea, however a non-contact instrument has been reported.^{[{{fullurl:Template:FULLPAGENAME}}#endnote_nocontact]} Disposable covers, which come in actual contact with the eye, have also been evaluated.^{[{{fullurl:Template:FULLPAGENAME}}#endnote_dispocover]}

See also

• B-scan ultrasonography
• Ultrasonography

References

1. Santodomingo-Rubido, J.; Mallen, E.A.H.; Gilmartin, B.; and Wolffsohn, J.S. (2002). A new non-contact optical device for ocular biometry.British Journal of Ophthalmology. 86, 458-462.
2. Cass, K.; Thompson, C.M.; Tromans, C.; and Wood, I.C.J. (2002). Evaluation of the validity and reliability of A-scan ultrasound biometry with a single use disposable cover.British Journal of Ophthalmology. 86, 344-349.

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It uses material from the http://en.wikipedia.org/wiki/A-scan+ultrasound+biometry Wikipedia article A-scan ultrasound biometry.