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

Figure 4

Blink artifacts. In a Cirrus-HD OCT right optic disc scan, two blinks produced two well-demarcated rectangular areas of missing data and red “superpixels” spanning the entire width of the retinal nerve fiber layer (RNFL) thickness map (a) and the RNFL deviation map (b). The upper blink affected the scan circle in two regions, as seen on the circular tomogram by two characteristic vertical black shadows interrupting the retinal profile (c). Note the corresponding RNFL thinning with abnormal classification results in clock hours 2 and 10 (d). The upper blink also affected the accuracy of the superior optic disc and cup margins ((e) arrows), leading to superotemporal scan circle displacement (f).

(a)

(b)

(c)

(d)

(e)

(f)