Stratus OCT User Manual PN 2660021134133 A
Analysis Protocols
6-13
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Analyses and Reports
These protocols yield quantitative and visual information that facilitates the detection and
management of retinal diseases.
General Information
Methods to Measure Retinal and RNFL Thickness
The Stratus OCT calculates retinal thickness as the distance between the vitreoretinal
interface (VRI) and the junction between the inner and outer segment of the
photoreceptors, which is just above the retinal pigment epithelium (RPE). It calculates
RNFL thickness as the distance between the VRI and the RNFL posterior boundary. The
retinal and RNFL thickness algorithms use an iterative process, applying various techniques
in a fixed and logical progression, first to obtain rough estimates of the layer boundaries,
and then to refine the estimates. The algorithm calculations operate on reflectivity values
(in decibels) in the individual A-scans. These algorithms take advantage of the Stratus
OCT’s high resolution, resulting in a highly refined objective measurement of retinal or
RNFL thickness. The processed scan image shows the boundaries in white.
Retinal Thickness/Volume
Application: Select Retinal Thickness/Volume to obtain for each eye two circular maps
centered on the macula that depict retinal thickness and volume. This analysis protocol
operates on one OD and/or one OS scan group made with the
Line or (FAST) Macular
Thickness Map protocols.
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