Average RNFL thickness indicates a patient’s overall RNFL health. The mean value for RNFL thickness in the general population is 92.9 +/- 9.4 microns. Typically, a normal, nonglaucomatous eye has an RNFL thickness of 80 microns or greater. An eye with an average RNFL thickness of 70 to 79 is suspicious for glaucoma.

Which OCT a parameter has the lowest floor effect in glaucoma?

SD-OCT
Moreover, we found SD-OCT measured ganglion cell-inner plexiform layer thickness was the least likely parameter to reach the floor across the majority of the image area at baseline, suggesting this parameter is the most informative of the parameters investigated for detecting disease-related change in advanced glaucoma …

What is RNFL circular Tomogram?

Right eye circular tomogram showing the retinal nerve fiber layer (RNFL; between red lines). From L to R, quadrants are temporal, superior, inferior, nasal, and temporal, of a healthy control. Source publication.

What is the normal range of cup to disc ratio?

about 1/3
The normal cup to disc ratio (the diameter of the cup divided by the diameter of the whole nerve head or disc) is about 1/3 or 0.3. There is some normal variation here, with some people having almost no cup (thus having 1/10 or 0.1), and others having 4/5ths or 0.8 as a cup to disc ratio.

What is OCT RNFL?

Optical coherence tomography (OCT) is a non-contact optical technique that allows imaging and measurement of the retinal nerve fiber layer (RNFL). Since 1991,1 OCT has undergone rapid evolution for use in detection and monitoring of glaucoma and macular diseases.

What is optic nerve Oct?

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 is an OCT test for the eyes?

Optical Coherence Tomography (OCT) is a non-invasive diagnostic instrument used for imaging the retina. It is the technology for the future because it can enhance patient care. It has the ability to detect problems in the eye prior to any symptoms being present in the patient.

Can RNFL Oct be used to monitor progression in advanced glaucoma?

Once the RNFL thickness reaches the floor, progression can still occur, but it can’t be detected by RNFL OCT. For that reason, the clinician should consider the use of macular OCT (discussed below) and HVF 10-2 to monitor progression in advanced glaucoma.

What is the role of Oct in the workup of glaucoma?

In early glaucoma, OCT of the RNFL and macula may be important for patients with normal or unreliable visual field tests. In moderate glaucoma, the correlation between OCT measurements and VF tests helps to confirm progression.

How to assess for progression with RNFL thickness obtained by Oct?

To assess for progression with RNFL thickness obtained by OCT, we need to be aware of a few factors: thinning due to normal aging; the floor effect of this parameter; thinning suggestive of glaucoma progression, both globally and within a sector; and correlation of RNFL loss with visual field loss.

How is glaucoma progression measured with optical coherence tomography?

Before the introduction of optical coherence tomography, determination of glaucoma progression relied heavily on clinical assessment of the optic nerve, comparison of disc photos over time and visual field analysis.