From: The Effect of Age on Optic Nerve Axon Counts, SDOCT Scan Quality, and Peripapillary Retinal Nerve Fiber Layer Thickness Measurements in Rhesus Monkeys Trans. Vis. Sci. Tech.. 2014;3(3):2. doi:10.1167/tvst.3.3.2 Figure Legend: (A) Peripapillary RNFL thickness plotted versus age for the right eyes (blue circles) and left eyes (green triangles) of N = 78 monkeys. The blue line shows the best-fitting linear model for the group of right eyes: RNFLT(μm) = −0.39 × age(years) + 104.4 μm (R 2 = 0.09, P = 0.006) and the green line shows the best-fitting linear model for the group of left eyes: RNFLT(μm) = −0.41 × age(years) + 104.6 μm (R 2 = 0.10, P = 0.005). (B) Optic nerve axon count plotted versus age for healthy control eyes (N = 46). The line shows the best fitting linear model: axon count = −1364 × age(years) + 1,210,284 (R 2 < 0.01, P = 0.74). (C) Average SDOCT scan quality score (SQS) plotted versus age for N = 78 monkeys. The line shows the best-fitting linear model: SQS(dB) = −0.27 × age(years) + 33.6 dB (R 2 = 0.42, P < 0.0001). (D) Average RNFLT plotted versus signal-to-noise ratio (SNR, i.e., linearized SQS) for N = 78 monkeys. The line shows the best-fitting linear model: RNFLT(μm) = 0.005 × SNR + 92.8 (R 2 = 0.25, P < 0.0001). Date of download: 10/21/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.