Figure 4.

Normal optic nerve (left eye). (A) Normal visual field represented by the grayscale map. Darker areas indicate lower sensitivities, while higher sensitivities are represented by a lighter tone. This graphical representation allows easy interpretation of visual field loss, and is usually used to demonstrate vision changes to the patient; (B) Normal optic disc with a healthy neuroretinal rim; Glaucomatous optic nerve (right eye). (C) Dense glaucomatous arcuate scotoma; (D) Glaucomatous optic disc with evident narrowing of the superotemporal and inferotemporal neuroretinal rim.