. Author manuscript; available in PMC: 2015 May 7.

Published in final edited form as: Am J Ophthalmol. 2014 Jan 30;157(5):953–959. doi: 10.1016/j.ajo.2014.01.014

Table 2.

Percentage of Normal and Glaucoma Eyes that Met the ISNT Rule for Retinal Nerve Fiber Layer Thickness. The ISNT rule holds when the retinal nerve fiber layer (RNFL) is thickest in the inferior quadrant, followed by superior, nasal, and then temporal quadrants. Optical coherence tomography RNFL thickness values are shown.

Quadrant	Normal (n=87)	Glaucoma (n=108)
Quadrant	Mean ± SD [95% CI] (μm)	Mean ± SD [95% CI] (μm)
Inferior	126.5 ± 17.1 [122.9 to 130.1]	67.0 ± 21.9 [62.9 to 71.1]
Superior	117.0 ± 17.1 [113.4 to 120.6]	71.3 ± 23.6 [66.8 to 75.8]
Nasal	75.9 ± 13.8 [73.0 to 78.8]	49.9 ± 19.1 [46.3 to 53.5]
Temporal	69.0 ± 10.4 [66.8 to 71.3]	52.4 ± 15.2 [49.5 to 55.3]
ISNT rule met	42/87 (48.3%)	7/108 (6.5%)

SD, standard deviation; CI, confidence interval.