A-scan ultrasound biometry, commonly referred to as an A-scan, is diagnostic test used in optometry or ophthalmology. It provides data on the eye length for calculation of intraocular lens power.
Why is a scan needed before cataract surgery?
When cataract surgery is performed, the natural lens in the eye is removed and replaced with a man-made intraocular lens implant (IOL). Regardless of the type of lens implant used, standard or Premium, measurements of the eye are needed before surgery. These measurements are highly precise, and combined with special computerized calculations, allow the surgeon to choose the lens implant power that is appropriate for each eye. Because each eye has a different size and shape, the power in the lens implant needed is different depending upon the many measurements of that eye. For this reason, an A Scan is always required prior to cataract surgery.
Will I feel anything during the a scan is going on?
No. The eye is numbed which lasts for 4 to 5 minutes andpatient is asked to look straight at the eye level. A scan probe is just touched the front part of the eye that is cornea and quickly readings are recorded.
The entire procedure takes not more than 10 minutes.
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