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RNFL thickness in eyes with progressive NAION. Mean RNFL thickness values of four optic disc quadrants at each stage (T1–T5) of the follow-up period.
RNFL = retinal nerve fibre layer; T1 = onset; T2 = asymptomatic optic disc swelling; T3 = progressive phase; T4 = prednisone treatment; T5 = final testing.
