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Keith-Wagener-Barker Classification of Hypertensive Retinopathy
| Grade 1 | Mild generalized retinal arteriolar narrowing |
| Grade 2 | Definite focal narrowing and arteriovenous nipping |
| Grade 3 | Signs of grade 2 retinopathy plus retinal hemorrhages, exudates and cotton wool spots |
| Grade 4 | Severe grade 3 retinopathy plus papilledema |
