What is the meaning of OCT in ophthalmology?

Analysis: optical coherence tomography (OCT) is a diagnostic imaging technique developed in recent years. Advice:In ophthalmology as if the eye's CT, can show the tomographic image of the fundus tissue, giving us a new window, so that we can from a new perspective to re-understand and discover the fundus disease, especially helpful in the diagnosis of macular disease. (1) OCT images clearly show the location and level of the lesion, whereas FFA shows an angiographic image superimposed on the examined tissue. Therefore, OCT is better than FFA in displaying the level of lesions, but it should be noted that tomographic images cannot reach the molecular cell level, so they are not equivalent to tissue sections. (2) High resolution, axial resolution of 10μm, better than B-mode ultrasonography (30~40μm). (3)Measurement of tissues up to the micron level, such as the measurement of macular fissures or macular edema. (4) Near-infrared light is used as a detection light wave, which can pass through the mildly cloudy refractive interstitium. (5) The examination is non-contact, non-invasive and flash-free, and easily accepted by patients. (6) Without dilating the pupil (4mm) can also be examined, but the effect of dilating the pupil examination is better. The most distinctive feature is the ability to clearly present the cross sectional image of the examined area.