Is OS junction in OCT?
Optical coherence tomographic (OCT) signs of type 2 MacTel include hyporeflective spaces in the inner and outer retina, and a discontinuity (break) in the line commonly attributed to the junctions of the photoreceptor inner and outer segments (IS/OS line).
What does an OCT scan do?
Optical Coherence Tomography (OCT) is a non-invasive diagnostic instrument used for imaging the retina. The OCT allows for detection of other diseases such as macular holes, hypertensive retinopathy and even optic nerve damage.
What are the different types of OCT scans?
There are currently two distinct OCT technologies commercially available: the older time domain technology and the newer spectral or Fourier domain OCT technology.
What is OS junction?
2) The ellipsoid zone (EZ), which was previously referred as the photoreceptor inner segment/outer segment (IS/OS) junction, is now thought to be formed mainly by mitochondria within the ellipsoid layer of the outer portion of the inner segments of the photoreceptors.
Is OS an ellipsoid?
The ellipsoid zone (EZ), formerly known as the inner/outer segment of photoreceptors (IS/OS), refers to the second hyper-reflective band on an optical coherence tomography (OCT) image (Fig. 1)8,9.
What is OCT of optic nerve?
Optical coherence tomography (OCT) is a non-invasive imaging technique routinely used in ophthalmology to visualize and quantify the layers of the retina. It also provides information on optic nerve head topography, peripapillary retinal nerve fiber layer thickness, and macular volume which correlate with axonal loss.
What does optical coherence tomography ( OCT ) show?
Posterior segment evaluation with optical coherence tomography (OCT) allows visualization of the vitreous, retinal layers, retinal pigment epithelium (RPE) and the choroidal layers. Figure 1: SD-OCT scan of a normal right eye. The vitreous, retinal layers and choroidal layers are visible.
What does an Oct scan show in the right eye?
Fig. 1. This Optovue OCT scan shows thinning of the inferior RNFL (absence of “warmer” greens/yellows, and more “cool” blue inferior to the disc) and the inferior ganglion cell complex (presence of red areas below the horizontal) in the right eye.
What causes poor image quality on Oct scan?
Although SD-OCT technology gives highly reproducible results in optimal patients, the technology can still be confounded by poor signal strength. Common causes include media opacity, ocular surface disease, reduced tear film quality, miotic pupils and image or motion artifacts.
Can a choroid be seen on a SD-OCT scan?
The choroid can be visualize on SD-OCT scans. Utilizing enhanced-depth imaging (EDI) or imaging with longer wave-length OCT the details and thickness can be intensified. Certain conditions that affect the choroid have been found to have an abnormally thicker choroid.