If your optometrist has asked you to have Corneal Topography, you may wonder what it involves. This article is for you!
Firstly, what is your cornea?
The cornea is the transparent tissue on the outer part of the eye. It is situated in front of the iris (the coloured part of the eye) and the pupil.
The cornea plays a vital optical role and acts as a shield in protecting the eyes from dust and foreign particles as well as filtering damaging ultraviolet rays from the sun.
It is the first structure where light enters before it is focused onto the back of the eye. Therefore, any irregularities on the surface of the cornea can lead to significantly poorer vision.
So, what is a corneal topography and what does it do?
The corneal topography captures a 2D colour map of the corneal surface of the eye, and has a 3D perspective. It is performed with a corneal topographer, a unique imaging device available at Martin and Lobb Eyecare.
This allows your optometrist to assess the shape of the cornea which is normally smooth and to detect any irregularities. This test makes it easier to diagnose and monitor for corneal conditions such as astigmatism, keratoconus and pellucid marginal degeneration.
The scans from your corneal topography can also help find what type of contact lens can be worn to improve your vision. They are also used in orthokeratology - a procedure during which a specialty hard contact lens is worn only while sleeping, typically to help control myopia/ short-sightedness in young individuals, for more info refer to our article.
When and where will this test be done?
Thanks to having the equipment at the practice, we are able to perform it here at Martin & Lobb Eyecare. If you and your optometrist have the time, your corneal topography can be done during your consultation. If not, you will need to book a time with our receptionists.
What will happen during this test?
You will be seated facing a large bowl with lighted circles inside it. There is a chin and forehead rest, so your head is kept steady to get the clearest images.
You will be asked to stare at a fixed target in the bowl while the pictures are taken. The scan only takes a few seconds, but it may need to be repeated a few times.
This test is painless and non-invasive. The advanced-technology instrument we are using never touches your eye so there won’t be any discomfort.
After the test concludes, the instrument will provide scans which show the 3D map of the corneal surface of the eye.
The results from your corneal topography will be analysed by your optometrist and your diagnosis will be discussed with you. Most likely your optometrist will show you the 2D maps of the corneal surface of your eye(s).
How much does this test cost?
A consultation with your optometrist is usually around $85 and to this will be added the Corneal Topography cost of $25. Martin & Lobb Eyecare offers payment options such as Afterpay, if you wish to have more information please get in touch with our receptionists.