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Abstract
Optical coherence tomography (OCT) is a new technique in the diagnosis of macular diseases uses a lower coherence interferometry to by giving optical sections in ocular tissues. The principle of OCT by using infrared Diode laser, is based on analysis the time of light delay from optical signals that have been reflected from ocular tissues such as the retina.
It has the advantage of being non invasive, non contact, comfortable and well tolerated by the patient. It does not require dye injection or radiation exposure.
OCT is better tolerated by patient than either fluorscein angiography or slit lamp biomicroscopy.
It is analogous to ultrasound except that optical rather than acoustic reflectivity is measured, it needs no direct contact with cornea or immersion of the eye in liquid.
The retinal reflectivity is translated into a false colour scale where bright colours such as red and white represent regions of high optical reflectivity and dim colours such as blue and black represent areas of low reflectivity.
The aim of this study is to evaluate the efficacy of OCT in diagnosis of the common macular diseases.