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A-Scan Ultrasound
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Dr. Aditya Raut M.B.B.S D.O.MS
Updated on Mar 25  •  2 mins read

Table of contents

What is A-Scan Ultrasound
When to do A-Scan Ultrasound
Diseases in which A-Scan Ultrasound is done
Symptoms that require A-Scan Ultrasound
How A-Scan Ultrasound is done
How long will A-Scan Ultrasound take
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What is A-Scan Ultrasound

A-Scan Ultrasound is a type of diagnostic imaging technology used to measure the length and shape of the eye.It works by using sound waves to create a detailed image of the eye's internal structures.

This includes the lens, cornea, and other structures in the eye like the vitreous humor.The information collected by the A-Scan is used to diagnose and treat various eye conditions, such as glaucoma and cataracts.

It is also used to measure the intraocular pressure of the eye, which helps to diagnose and treat many other ocular conditions.The procedure is relatively painless and non-invasive, with no side effects.

It can be used to evaluate the eye before and after surgery, as well as to monitor the progress of the treatment.

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When to do A-Scan Ultrasound

  1. A-Scan Ultrasound is typically used to measure the length of the eye and can be used to diagnose various eye conditions, such as cataracts, glaucoma, and macular degeneration. It can also be used to monitor the progression of an existing condition, or to determine the best type of corrective surgery to be done.
  2. A-Scan Ultrasound should be done for any patient who is suspected of having any of the above-mentioned eye conditions, as well as for anyone who is considering corrective eye surgery. It is also typically recommended for patients who have progressive vision loss, a change in the shape or size of the eye, and/or a change in the appearance of the pupil.
  3. In terms of when a patient should consult a doctor urgently for A-Scan Ultrasound, this is generally recommended if they are experiencing sudden, severe vision loss, eye pain, or changes in their vision that cannot be explained. If a patient is experiencing any of these symptoms, it is important for them to seek medical attention as soon as possible in order to ensure the best possible outcome.
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Diseases in which A-Scan Ultrasound is done

  1. Glaucoma: A-Scan Ultrasound can measure the thickness of the eye wall, which helps diagnose glaucoma as increased thickness could be indicative of increased intraocular pressure.
  2. Cataract: A-Scan Ultrasound can measure the length of the eye and the size of the cataract, helping to determine the degree of cataract present and the best way to treat it.
  3. Retinal Detachment: A-Scan Ultrasound can identify retinal detachment by measuring the thickness of the retina and the presence of any shadows or detachment.
  4. Macular Degeneration: A-Scan Ultrasound can measure the thickness of the macula, which can help determine the extent of macular degeneration.
  5. Diabetic Retinopathy: A-Scan Ultrasound can measure the thickness of the retina and identify any signs of diabetic retinopathy such as retinal hemorrhage.
  6. Optic Neuritis: A-Scan Ultrasound can measure the size of the optic nerve and the thickness of the retina, which can help diagnose optic neuritis.
  7. Uveitis: A-Scan Ultrasound can measure the thickness of the eye wall and identify any signs of inflammation, which can be indicative of uveitis.
  8. Lens Subluxation: A-Scan Ultrasound can measure the length of the eye and the position of the lens, which can help diagnose lens subluxation.
  9. Dry Eye Syndrome: A-Scan Ultrasound can measure the thickness of the eye wall and the presence of any tears, which can help diagnose dry eye syndrome.
  10. Keratoconus: A-Scan Ultrasound can measure the thickness of the cornea and identify any signs of corneal thinning, which can be indicative of keratoconus.
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Symptoms that require A-Scan Ultrasound

  1. Unusually high intraocular pressure: A-Scan Ultrasound is indicated if you are experiencing unusually high pressure in the eye, which can cause headaches or aching eyes.
  2. Retinal detachment: A-Scan Ultrasound is indicated if you are experiencing a sudden floaters or flashes of light in your vision, or a shadow or curtain covering part of your vision.
  3. Glaucoma: A-Scan Ultrasound is indicated if you are experiencing a gradual decrease in your peripheral vision, or if you are having difficulty seeing at night.
  4. Vitreous hemorrhage: A-Scan Ultrasound is indicated if you are experiencing sudden vision loss or a dark spot in the center of your vision.
  5. Cataracts: A-Scan Ultrasound is indicated if you are experiencing blurry or cloudy vision, or difficulty seeing at night.
  6. Macular degeneration: A-Scan Ultrasound is indicated if you are experiencing a gradual decrease in vision, or if you are having difficulty seeing fine details.
  7. Diabetic retinopathy: A-Scan Ultrasound is indicated if you are experiencing new floaters in your vision, or if your vision appears wavy or distorted.
  8. Foreign body: A-Scan Ultrasound is indicated if you are experiencing pain, redness, or tearing in your eye, or if you feel like something is stuck in your eye.
  9. Uveitis: A-Scan Ultrasound is indicated if you are experiencing redness, pain, or blurred vision in one or both eyes.
  10. Optic neuritis: A-Scan Ultrasound is indicated if you are experiencing sudden vision loss, or if you have difficulty seeing colors or shapes.
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How A-Scan Ultrasound is done

  1. A-scan ultrasound is an imaging test used to measure the length of your eye. It is a safe, painless procedure that uses sound waves to measure the length of your eye from front to back. During the test, a probe is placed in your eye and an ultrasound image is created. The probe sends sound waves into the eye, which are reflected back to the machine and are converted into an image.
  2. The A-scan ultrasound will be performed using automated equipment, so it should be a quick procedure. The automated equipment will measure the length of your eye and provide a visual image of your eye. This image will be used to help your doctor diagnose any eye issues you may have. The automated equipment also allows for faster and more accurate results.
  3. If you have any questions before or during the A-scan ultrasound, please don't hesitate to ask your doctor or technician.
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How long will A-Scan Ultrasound take

  1. .
  2. The test will typically take about 15 minutes to perform and the report is usually available within 24 hours. Depending on the complexity of the case, it may take longer. I will provide you with the report as soon as it is available.
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Reviewed By

Dr.Aditya Raut, MBBS, DOMS, Cataract and Refractive Surgeon, with experience of over 3000 cataract surgeries.
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Article Reviewed by Dr. Aditya Raut M.B.B.S D.O.MS Cataract Lasik and refractive surgeon
Specialist in number reduction surgery, Refractive Lens exchange and ICL surgery.
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