Ocular Coherence Tomography OCT

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What is it?

OCT stands for optical coherence tomography.This is a computerized imaging technique that uses laser light to make a 3D image of the retina. The OCT uses an array of light to rapidly scan theeye.These scans are interpreted and the OCT then presents an image of the tissue layers within the retina..

What is it done for?

OCT provides remarkably detained information about the retina and allow doctors to see abnormalities that are not apparent on regular clinical examination .It is particularly useful in certain diseases of the macula and in glaucoma.

How is it done?

It is a simple test to perform.Usually the pupil must be dilated and then the patient sits infront of a special type of camera and pictures are taken of the structures inside the eye.This test is painless and comfortable.

What are the benefits?

OCT provides remarkably detained information about the retina and allow doctors to see abnormalities that are not apparent on regular clinical examination.It is particularly useful in certain diseases like macular holes,diabetic retinopathy and optic nerve damage.

What are the limitations?

1- Experienced operator required for quantitative data acquisition.
2-Signal strength may impact nerve fiber layer thickness measurement..
3-RNFL detection algorithm may fed.
4-Ability to detect change needs validation.
5-Often requires papillary dilation to achieve optimal image quality.

How much time is taken?

For cooperative patients the test can be completed in a few minutes.

When is to be repeated?

As per doctors advise.

What are other alternative tests.

Retinal nerve fibre layer thickness test.

How much does it cost?

The cost may vary from one hospital to the other.

Author: Dr Sanjay Dhawan, New Delhi, India
Updated on 31 May 2011

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Dr. Sanjay Dhawan, MBBS, MS (Gold Medalist), DO - Additional Director & Head of Department - Ophthalmology. Phone: +91-9810009144
Appointment by phone: +91-9540009144/+91-9910009144OR call Helpline (+91) 9910009144 for any assistance.
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