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Table 3 The nerve/eye index in healthy adults

From: Quantitative relations between the eyeball, the optic nerve, and the optic canal important for intracranial pressure monitoring

ONSD/ETD index Right eye Left eye
Average 0.19 ± 0.01 0.19 ± 0.02
Max 0.26 0.26
Min 0.15 0.15
  1. The index is calculated as ONSD taken from the middle part of the intraorbital path of the optic nerve divided by the transverse diameter of the eyeball (ONSD/ETD).