If you are looking for a laser eye clinic in London, then the London Vision Clinic should be on your shortlist.
That may seem like a strong statement, but the London Vision Clinic emphasises that, in expert hands, laser eye surgery can be an extremely safe, life enhancing experience. More than 100,000 laser eye surgery procedures will be done in the UK this year. Read the guide to Laser Eye Surgery to help make the right choice for your eyesight.
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What is it for?
Measuring corneal thickness.
When is this done?
Initial screening and during post-operative appointments.
What actually happens?
Hand held ultrasound probes: A topical anaesthetic drop is placed in each eye. This will temporarily numb the surface of the eye for approximately 15 minutes. The optometrist then sits or stands in front of you and will gently hold open the lids. They will then use a handheld probe which is gently touched onto the surface of the eye to take several readings of the corneal thickness of each eye.
Very high-frequency ultrasound 3D scanning: In Very High Frequency Ultrasound (VHFU), you will have your eyes numbed with anaesthetic drops and have your eye positioned over a water tight rubber eyepiece which is then filled with warm saline solution (like artificial tears). Several arc scans of the entire cornea are made to the thickness profiles of the individual layers within the cornea including the thickness of the corneal flap following LASIK.
Optical pachymetry devices (incorporated in Topographers that map front and back surfaces): There are several optical devices which can measure the thickness of the cornea. They can measure the profile of the total corneal thickness although due to the assumptions made when calculating the thickness from the measurements they can be less accurate than ultrasound in providing the correct thickness values. However, they to provide 3D thickness profile information and this is important for screening for keratoconus.
The gold standard for corneal thickness measurement is ultrasound.
How does it feel?
Hand held ultrasonic pachymetry is not painful because of the use of anaesthetic eye drops, so you will not feel the probe touching the eye.
In VHFU the eye is very comfortable in the warm eye bath; there is no contact with the eye as the sound waves travel through the saline.
Optical Pachymetry – see Topography
What does it do?
Handheld pachymetry is used primarily to measure the central area of the cornea where the cornea is
thinnest. It takes point measurements of the total corneal thickness.
VHFU is the most precise way to measure the thickness of the cornea. In addition it provides 3D thickness profiles of the individual layers of the cornea, allowing improved diagnostic capabilities for both preoperative (candidacy) and postoperative analysis.
How does it benefit you?
Along with front and back surface topography, the thickness of your cornea is one of the most important safety factors in laser eye surgery. Your surgeon uses these measurements to determine if you are suitable for surgery and which type of treatment is your safest option.
VHFU scanning is also one of the most sensitive ways of diagnosing keratoconus, an eye condition which prevents any laser eye surgery.
Get a quote for laser eye treatment
If you are looking for a quote for laser eye surgery, or want more information about treatment in your local area, you can complete the Laser Eye Surgery Enquiry Form. Your enquiry will be forwarded to a maximum of three clinics or providers of laser eye treatment who partner with the Private Healthcare UK web site.