Aug 10, 2022 · A-scan biometry, also referred to as A-scan, utilizes an ultrasound device for diagnostic testing. This device can determine the length of the eye and can be useful in …

A-scan biometry measures the axial length (AL) of the eye prior to cataract surgery in order to assess the refractive power of the intraocular lens that will be implanted.

Sep 27, 2025 · There are two main types of ultrasound used in ophthalmologic practice currently, A-Scan and B-scan. In A-scan, or time-amplitude scan, sound waves are generated at 8 MHz …

Mar 29, 2025 · A-Scan biometry is a specialized ultrasound technique used in ophthalmology to measure the axial length (AL) of the eye. It is essential for determining the power of intraocular …

The A-scan ultrasound projects a single, one-dimensional beam of sound waves through the eye and then measures reflections. A reflection happens at the junction of two different densities. …

Using this advanced A-scan biometry technique, an extra +0.32 mm is added to the displayed axial length to correct for the thickness and different velocities of the lens and cornea.

Biometry is used to determine axial length of the eye and to determine the depth of the anterior chamber, lens and vitreous cavity. The A-scan ultrasound is the most commonly employed, …

Jan 11, 2024 · Compare the different techniques of biometry, including applanation and immersion biometry, to interpret scan quality. Determine the indications and importance of …

IN this video we talk in detail about A scan biometry. Biometry can be divided into two types based on whether sound waves are used (ULTRASOUND BIOMETRY) or light energy is used …

Jan 29, 2011 · In this series of videos, Sandra Frazier Byrne discusses the principles of A-scan ultrasound, demonstrates the applanation and immersion methods, and explains how to …