A-scan

An A-scan is a type of ultrasound test used primarily in eye care to measure the length of the eye and assess its structures. It works by sending very fast sound waves into the eye, which bounce back when they hit different tissues. A device then measures the time it takes for the echoes to return, helping eye doctors determine measurements critical for making accurate prescriptions for surgeries like cataract removal. Essentially, it’s a precise, quick way to gather detailed information about the eye’s internal dimensions using sound waves.