Information of RNFL thickness from previous studies
| Study | Year | OCT | Country | N | Age | RNFL thickness (μm) | ||||
| Average | Temporal | Superior | Nasal | Inferior | ||||||
| Girkin et al 24 | 2010 | Stratus OCT | Africa | 315 | 45.1±13.3 | 103.7±10.7 | 66.5±11.1 | 128.8±17.2 | 84.3±17.2 | 135.1±16.3 |
| Girkin et al 24 | 2010 | Stratus OCT | Europe | 290 | 47.7±15.9 | 100.6±10.9 | 71.5±12.6 | 120.9±17.5 | 80.8±16.3 | 129.2±17.4 |
| Celebi and Mirza25 | 2013 | Cirrus SD-OCT | Turkey | 121 | 38.9±11.2 | 97.0±7.4 | 64.7±6.4 | 119.2±11.2 | 74.8±8.2 | 129.3±11.7 |
| Alasil et al 26 | 2013 | Spectralis OCT | Mixed | 190 | 53.7±16.3 | 97.3±9.6 | 70.6±10.8 | 117.2±16.3 | 75.0±14.0 | 126.0±15.8 |
| Park et al 27 | 2005 | Stratus OCT | Korea | 121 | 43.2±13.9 | 112.7±15.0 | 85.2±17.9 | 137.5±20.0 | 89.5±22.2 | 138.1±20.8 |
| Budenz et al 28 | 2007 | Stratus OCT | America | 328 | 47.4±15.8 | 100.1±11.6 | ||||
| Schuster et al 29 | 2016 | Topcon 3D-OCT | Caucasian | 306 | 38.8±10.9 | 87.0±11.0 | 124.0±13.0 | 93.0±15.4 | 138.0±13.6 | |
| Cheung et al 19 | 2011 | Cirrus HD-OCT | Chinese | 542 | 53.0±6.4 | 97.6±9.1 | 71.6±11.2 | 123.0±15.9 | 69.2±10.8 | 126.8±16.2 |
| Sung et al 30 | 2009 | Stratus OCT | America | 226 | 47.5±15.9 | 100.8±10.5 | ||||
| Leung et al 31 | 2004 | Stratus OCT | China | 107 | 53.0±11.8 | 103.2±10.0 | ||||
| Kanamori et al 32 | 2003 | Humphrey OCT | Japan | 144 | 46.3±18.1 | 123.0±11.6 | 101.0±18.5 | 148.0±18.4 | 96.0±19.2 | 146.0±19.3 |
| Fujiwara et al 9 | 2019 | Topcon 3D-OCT | Japan | 749 | 58.0±10.0 | 102.3±0.9 | ||||
| Zangalli et al 33 | 2018 | Spectralis OCT | Brazil | 220 | 44.0±13.9 | 103.0±10.4 | 67.7±10.6 | 86.0±13.8 | ||
| Perez et al 34 | 2018 | Cirrus OCT | Vietnam | 151 | 60.8±11.1 | 97.9±9.2 | 69.7±10.1 | 119.7±15.1 | 73.4±13.8 | 128.6±15.4 |
| Manassakorn et al 35 | 2008 | Stratus OCT | Thailand | 250 | 44.7±12.2 | 109.3±0.7 | 75.1±0.7 | 136.0±1.0 | 83.6±1.0 | 142.4±1.1 |
| Appukuttan et al 36 | 2014 | Spectralis OCT | India | 150 | 20–75 | 101.4±8.6 | 72.0±7.7 | 125.3±13.7 | 79.7±12.1 | 128.3±14.7 |
| Al-Sa'ad et al 37 | 2018 | RTVue OCT | Jordan | 148 | 60.0±12.0 | 99.0±11.0 | 82.0±20.0 | 114.0±20.0 | 75.0±16.0 | 125.0±20.0 |
| Varma et al 38 | 2003 | OCT 2000 | Latino | 312 | 51.9±9.8 | 132.7±14.4 | 102.5±19.0 | 157.7±17.8 | 109.3±19.1 | 159.8±18.9 |
| Kang et al 39 | 2016 | iVue-100 OCT | China | 1811 | 7.1±0.4 | 102.0±0.2 | 80.2±0.2 | 125.1±0.3 | 75.9±0.3 | 126.8±0.3 |
| Méndez et al 40 | 2017 | Spectralis OCT | France | 427 | 81.6±4.2 | 86.8±13.7 | 67.2±13.4 | 66.2±16.4 | ||
| Kanno et al 41 | 2010 | EG-SCANNER | Japan | 460 | 44.0±14.5 | 111.8±10.0 | ||||
| Gupta et al 42 | 2015 | Cirrus HD-OCT | Singapore | 843 | 66.7±10.4 | 92.9±11.4 | 67.4±11.4 | 116.1±18.4 | 69.7±11.3 | 118.6±19.8 |
| Rougier et al 22 | 2015 | Spectralis OCT | French | 210 | 81.0±3.6 | 91.4±12.6 | 70.1±14.7 | 69.1±16.3 | ||
| Ho et al 43 | 2019 | Cirrus HD-OCT | Chinese | 1371 | 57.4±7.0 | 95.7±9.6 | 71.4±12.2 | 119.9±16.7 | 68.1±10.9 | 123.4±16.7 |
| Ho et al 43 | 2019 | Cirrus HD-OCT | Malay | 1303 | 60.6±8.6 | 94.9±10.6 | 67.8±11.3 | 118.6±17.3 | 71.0±10.9 | 122.4±18.3 |
| Ho et al 43 | 2019 | Cirrus HD-OCT | Indian | 1801 | 60.7±7.8 | 87.3±10.6 | 59.2±10.9 | 108.8±16.5 | 69.1±11.1 | 112.3±17.3 |
| Zhu et al 44 | 2013 | iVue-100 OCT | China | 1955 | 12.3±0.6 | 103.1±9.0 | 83.0±10.6 | 126.2±15.2 | 73.8±13.9 | 129.3±14.9 |
| Wang et al 45 | 2018 | Spectralis OCT | China | 1440 | 11.9±3.5 | 101.3±9.2 | 85.2±14.3 | 61.7±20.4 | ||
| Nousome et al 46 | 2021 | Cirrus HD-OCT | Mixed | 6133 | 60.1±7.4 | 95.1±10.1 | 65.6±12.2 | 118.6±16.5 | 71.2±11.1 | 125.1±17.3 |
| Malik et al 47 | 2012 | Stratus OCT | India | 150 | 42.6±13.6 | 101.1±10.1 | 65.7±12.1 | 125.8±16.5 | 83.6±17.4 | 127.5±15.6 |
| Bendschneider et al 8 | 2010 | Spectralis OCT | America | 170 | 20–78 | 97.2±9.7 | 68.8±11.1 | 118.0±14.5 | 76.4±15.0 | 123.7±16.4 |
| Wang et al 48 | 2013 | iTVue OCT | China | 1654 | 66.2±9.9 | 103.2±12.6 | 79.8±12.2 | 126.1±19.1 | 75.1±12.6 | 131.4±20.6 |
| Hashemi et al 49 | 2017 | Cirrus HD-OCT | Iran | 3084 | 54.3±5.6 | 92.5±0.3 | 65.5±0.4 | 111.2±0.5 | 74.8±0.8 | 118.9±0.6 |
| Thapa et al 50 | 2014 | Spectralis OCT | Nepal | 156 | 38.9±17.0 | 102.6±9.6 | 70.7±15.5 | 129.5±15.1 | 76.6±12.0 | 134.5±17.2 |
| Ismail et al 51 | 2019 | Spectralis OCT | South Africa | 132 | 41.3±12.5 | 108.7±10.7 | 74.8±10.3 | 77.7±14.6 | ||
| Zhao et al 17 | 2014 | Spectralis OCT | China | 2548 | 63.5±9.1 | 102.0±11.0 | 76.0±13.0 | 73.0±15.0 | ||
| Mashige and Oduntan52 | 2016 | iVue-100 OCT | South Africa | 600 | 10–66 | 110.0±7.4 | 73.6±15.7 | 132.0±10.5 | 87.2±13.2 | 135.1±9.7 |
| Budenz et al 53 | 2005 | Stratus OCT | America | 109 | 42.8±14.6 | 104.8±10.7 | 75.1±17.2 | 130.9±18.2 | 79.8±17.2 | 133.4±18.7 |
| Hoffmann et al 21 | 2018 | Spectralis OCT | Germany | 1974 | 40–80 | 96.0±10.3 | 68.8±12.9 | 72.2±15.1 | ||
| Feuer et al 54 | 2011 | Stratus OCT | America | 425 | 46.0±15.0 | 104.7±10.8 | ||||
RNFL, retinal nerve fibre layer; SD-OCT, spectral-domain optical coherence tomography.