Detailed Information on A and B Eye Scanning

According to reports, millions of people have visual problems. In many ways, contact lenses can make vision clear again. Let’s explore this topic in more detail.

Are you worried about your visual deterioration? In the age of digital technology, the human eye is subjected to several times the load of the previous, it is influenced by a huge number of factors. From regular book reading to constant work behind digital devices radiating the blue spectrum.

In order to understand exactly what cause of vision loss ophthalmologists use various tests using an ultrasonic scanner. Marano Eye Care in New Jersey uses two tests – A-scan and B-scan. Next we will understand how these tests work, what is their essence and what is required for their use.

Scan A

Amplitude scanning, or in contraction scanning A, is a kind of ultrasonic biometrics capable of displaying eye length information. For many common eye diseases (such as short-sightedness or long-sightedness), the definition of eye length plays a significant role. In most cases, such tests accurately determine the nature of the problem, excluding surgery.

Scan B

B-scan is a brightness scan. It is used in ophthalmology to obtain a two-dimensional cross section of the eye and its eye socket. This type of scan is used when the basic inspection does not provide enough information.

How ultrasonic works on the eye

Any ultrasonic is based on sound physics. The radiation goes in a parallel longitudinal direction that moves vertically. When a sound hits an object, it bounces back. At this time, the sound wave returns to the ultrasonic apparatus, converting into an electrical signal. This signal is displayed on the monitor as an image.

It is because of this ability to penetrate solid surfaces that ultrasonic is used in a variety of activities, including construction, archaeology, and of course, medicine.

To change the depth of the image, the frequency of the sound wave changes, but since the eye does not have a large depth, high frequencies from 10 MHz to 50 MHz are used. To show how much this is, compare – the minimum frequency of ultrasonic can be 20,000 Hz, or 20 KHz.

A-scan and B-scan step by step

All A-scans and B-scans are performed in our Marano Eye Care departments.

When scanning A

1. Use of anesthetic drops;
2. Placing a person in a chair, in the future the collection is fixed, and the look is directed directly;
3. Position of the ultrasonic device on the front surface of the eye.

When scanning B

Before using the ultrasonic apparatus, gel is applied to the closed eyelids, just as a person will need to move his eyes in several directions.

What exactly can be diagnosed by A-scan or B-scan?

The A-scan functions are particularly used in determining the length of the eye with subsequent replacement of the lens, and there is also the possibility of detecting some types of tumors.

B-scan measures the structure and the eye socket, such a method yields details about different states of the eye, including: hemorrhage, retinal cancer, as well as detection of damaged tissues or trauma to the eye; any foreign bodies in the eye; swelling; retinal detachment.

Scanning speed and possible risks

Due to minimal resource consumption, the test is performed quickly, as is the detection of the results. A-scan should not cause any discomfort, but after anesthesia drops for a while the effect remains. Therefore, it is necessary to carefully touch the eyes before the effect is stopped. Contact with the eyes, with the action of anesthetic effect can inadvertently lead to scratches of the cornea.