What is a swept source OCT?

Swept-source OCT (SS-OCT; DRI-OCT, Topcon Japan) is the latest milestone in retinal and choroidal imaging. Simultaneous high-quality visualization of the vitreous, retina, and choroid is possible. Choroidal layers that are hardly distinguishable in conventional SD-OCT become visible.

How is glaucoma diagnosed with October?

OCT scans of the macula involve a strategy of six intersecting lines that intersect at the foveal center. Assessment of the macular region in glaucoma is necessary because over 50% of retinal ganglion cells lie in the macular region and hence it is the ideal region to detect early cell loss.

What is an OCT macula test?

Optical coherence tomography (OCT) is a non-invasive imaging test. OCT uses light waves to take cross-section pictures of your retina. With OCT, your ophthalmologist can see each of the retina’s distinctive layers. This allows your ophthalmologist to map and measure their thickness.

What is swept source technology?

optical coher- ence tomography (SS-OCT), “swept source” refers to the type of laser incorporated into the device. Instead of the superluminescent diode laser typical of conventional spectral domain OCT (SD-OCT), SS-OCT uses a short-cavity swept laser.

How is SD-OCT used to diagnose glaucoma?

The advent of SD-OCT made it possible to broadly sweep the entire posterior pole to map losses caused by glaucoma. Those losses are detectable by pattern recognition, specifically an arcuate shaped loss of thickness of the retina, Dr. Asrani explained.

How are OCT devices for glaucoma compare?

The RNFL and ONH scan on our patient confirmed our suspicions and agreed nicely with our clinical findings showing a thickness in the superotemporal region found in <1% of the normative database. Fig. 5. The Garway-Heath sectors from the Hood report, as determined by the Spectralis. Click image to enlarge.

How is optical coherence tomography used to monitor glaucoma progression?

Then along came optical coherence tomography (OCT). Although both are used to monitor glaucomatous progression, automated perimetry tests show functional change, while OCT reveals structural changes. Now evidence is accumulating that functional change lags behind structural change, sometimes by years.

Which is more sensitive for detecting glaucoma progression?

“OCT has greater sensitivity for detecting progression in early and moderate glaucoma.” Dr. Asrani: OCT is difficult to interpret in high myopes (greater than –8 or –9 D) because the structures of the retina do not conform to the normative database.