Optical Coherence Tomography
Optical Coherence Tomography (OCT) is an imaging technique which makes it possible to obtain a 3D view of the tissues. OCT is just like ultrasound testing; the only difference being that, here imaging is done using light in place of sound.
This is a painless test which is performed without touching your eyes. Usually your eyes are required to be dilated with the use of special drops. You will then be asked to sit in front of a special camera which will take pictures of the structures inside your eyes. If you are able to co-operate well, the test can be finished in a few minutes.
Optical Coherence Tomography can be used to detect many eye conditions like:
Retina: The macula (an area near the centre of the retina) can be studied. This is especially useful in the following conditions:
Glaucoma: In Glaucoma, an eye condition where there is vision loss usually due to raised eye pressure, OCT is done for two purposes:
Corneal Thickness: OCT can also be used to measure the thickness of the cornea i.e the outer transparent layer of the eye. This is required to be done in diseases of the cornea like ulcers and swelling or before surgeries like Lasik.