![StudyXing Medicine on X: "Cup:Disc ratio < 0.4 = non-glaucomatous nerve; C/D ratio 0.4 - 0.8 is NL disc (physiologic cupping), glaucoma suspect or early to mod glaucoma; C/D ratio 0.8 or StudyXing Medicine on X: "Cup:Disc ratio < 0.4 = non-glaucomatous nerve; C/D ratio 0.4 - 0.8 is NL disc (physiologic cupping), glaucoma suspect or early to mod glaucoma; C/D ratio 0.8 or](https://pbs.twimg.com/media/FoX4VeOaUAAoEgw.jpg:large)
StudyXing Medicine on X: "Cup:Disc ratio < 0.4 = non-glaucomatous nerve; C/D ratio 0.4 - 0.8 is NL disc (physiologic cupping), glaucoma suspect or early to mod glaucoma; C/D ratio 0.8 or
![Normal optic disc (a) vs glaucomatous cupping (b) [Images adapted with... | Download Scientific Diagram Normal optic disc (a) vs glaucomatous cupping (b) [Images adapted with... | Download Scientific Diagram](https://www.researchgate.net/publication/316990409/figure/fig1/AS:670002239778827@1536752390679/Normal-optic-disc-a-vs-glaucomatous-cupping-b-Images-adapted-with-permission-from.jpg)
Normal optic disc (a) vs glaucomatous cupping (b) [Images adapted with... | Download Scientific Diagram
![Color-coded serial optic disc images showing cupping (top) in an eye... | Download Scientific Diagram Color-coded serial optic disc images showing cupping (top) in an eye... | Download Scientific Diagram](https://www.researchgate.net/publication/11185137/figure/fig3/AS:601623634128913@1520449660566/Color-coded-serial-optic-disc-images-showing-cupping-top-in-an-eye-with-peak-IOP-of.png)