What information does A-scan echography provide?

A-scan echography is a form of ultrasound imaging used in ophthalmology that provides precise measurements of the eye's dimension and helps in evaluating various characteristics of intraocular structures. It is particularly adept at determining the character and size of lesions within the eye, such as tumors or other abnormalities, by reflecting sound waves off different tissue densities.

The principle behind A-scan echography involves sending ultrasonic waves into the eye; these waves reflect off surfaces and structures inside the eye, and by measuring the time taken for the echoes to return, the machine can calculate distances and sizes. This makes it an essential tool in assessing lesions, as it can provide quantitative data that can help in diagnosis and treatment planning.

While A-scan does not provide information about the topographic mapping of the retina, blood flow velocity, or surface texture of the lens, it excels in providing quantitative assessments of the lesions' properties, helping clinicians make informed decisions regarding management and follow-up.