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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. Disposable covers, which come in actual contact with the eye, have also been evaluated.

[edit] References

• 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.
• 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.

[edit] See also

• B-scan ultrasonography
• Ultrasonography