Page 44 - The UK Guide to Laser Eye Surgery
P. 44

44 Questions about technology
How does it feel?
Hand-held ultrasonic pachymetry is not painful - anaesthetic eye drops are used, so you will not feel the probe touching the eye.
During VHF ultrasound scanning, the eye is comfortable in the warm eye bath. The measurements are taken through sound waves which travel through the saline solution - so no instruments will touch the eye.
In optical pachymetry scans, the patient feels nothing (as in a topography/ tomography scan).
How does it benefit you?
Along with front and back surface tomography, measuring the thickness of your cornea is one of the most important safety factors in laser eye surgery. Using a pachymeter together with a topography device provides very accurate data and ensures that the thickness of your cornea is within safety limits. Your surgeon uses these measurements to determine whether you are suitable for surgery and which type of treatment is the safest option for you.
VHF ultrasound scanning is also one of the most sensitive ways of diagnosing keratoconus - an eye condition that prevents patients from having laser eye surgery.
The most advanced and accurate pachymetry device is the Artemis VHF ultrasound scanner. This measures corneal thickness more accurately than OCT, tomography or hand-held ultrasound machines. It produces a 3D image that displays the thinnest point of the cornea with great accuracy, and shows a profile of the depth of your cornea. This technology is currently only available in a handful of clinics around the world.

   42   43   44   45   46