A-Scan: The Foundation for a Successful Cataract Surgery
A-scan ultrasound is the advanced method we use for ocular biometry, that is, the precise measurement of the eye’s dimensions. It is the most critical preparatory step before any cataract surgery.
What we achieve
Using the ultrasonic biometrics system, we calculate the force with mathematical precision intraocular that will be implanted in your eye.
The Immersion Method
Unlike older contact methods, our clinic uses the immersion technique. With this technique, the ultrasound probe does not press against the cornea, eliminating any possibility of measurement error. This ensures the optimal refractive result postoperatively.
At the same time, the system offers the ability to ultrasound thickness measurement, for the precise measurement of corneal thickness, which is essential for the diagnosis of glaucoma and refractive errors.
Age-related macular degeneration: Identification of lesions and possible neovascular membranes.
Diabetic Retinopathy: Screening for bleeding and exudates in diabetic patients.
Vascular Seals: Detection of retinal vein or artery thrombosis.
Other Diseases: Macropathies, moles and other rarer pathological conditions.
Why is it necessary?;
If you are going to have surgery for cataracts, this is the examination that will determine the lens we put in your eye.
Biometrics: We measure the length of the eye to select the ideal intraocular lens, thereby reducing the need for glasses after surgery.
Pachymetry: We measure the thickness of the cornea, a vital measurement for monitoring intraocular pressure (glaucoma).
We use state-of-the-art technology (immersion method) to ensure that our measurements are 100% reliable and that your vision is restored to the greatest extent possible.
Frequently Asked Questions
Does an abdominal ultrasound hurt?;
No, it’s completely painless. Before the exam, we put anesthetic eye drops in your eye, so you won’t feel any discomfort. You simply look at a small light or straight ahead, while we take the measurements in just a few seconds.
What is the «immersion method,» and why is it better?;
With older methods, the doctor would place the ultrasound probe directly on the eye, applying light pressure. This pressure could slightly alter the shape of the eye and thus the measurement. With the immersion method, we place a small cup of liquid in front of the eye, and the ultrasound «floats» inside it without applying any pressure to your eye. This way, we obtain the most accurate measurement available, ensuring that the intraocular lens we order will be the perfect fit for you.
How long does the test take?;
It's very quick. The measurement process takes about 1–2 minutes for each eye.
Do I need to prepare anything before I come?;
If you wear contact lenses, you may need to stop wearing them for a few days before the exam, as the lenses can temporarily alter the shape of the cornea. Your doctor will give you specific instructions depending on the type of lenses you wear.
Why is skinfold measurement necessary?;
The thickness of the cornea (the front «window» of the eye) is important for many reasons. Most importantly, it helps us accurately assess intraocular pressure. A thin cornea can give us a falsely low pressure reading, while a thick one can give a falsely high reading. By knowing the thickness, the doctor can accurately determine whether there is a risk of glaucoma.