Factors Affecting Cirrus-HD OCT Optic Disc Scan Quality: A Review with Case Examples

Figure 2

Floater overlying the scan circle. In a Cirrus HD-OCT right optic disc scan, a floater determined a black area of missing data on the retinal nerve fiber layer (RNFL) thickness map ((a) red arrow) and a cluster of red “superpixels” on the RNFL deviation map overlying the inferotemporal sectors of the scan circle (b). A characteristic vertical black shadow interrupted the retinal profile and the RNFL segmentation lines on the circular tomogram ((c) red arrow). A superonasal RNFL segmentation artifact from other cause is indicated by the yellow arrow. In (d), the inferotemporal clock hours underlying the floater presented RNFL thinning with “outside normal limits” classification results.

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