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Br J Ophthalmol 82:43-47 doi:10.1136/bjo.82.1.43
  • Original Article
    • Clinical science

Echographic measurements of the retrobulbar optic nerve in normal and glaucomatous eyes

Table 2

Retrobulbar optic nerve dimensions for control, glaucoma, and ocular hypertensive eyes

Optic nerve measurement Control group (n=90) Glaucoma group (n=49) OHT group (n=17) p Value
Diameter (mm):
mean (SD) 2.98 (0.36) 2.58 (0.50) 3.02 (0.36) Control/Gl: <0.0001
 range 2.21–3.92 1.62–3.74 1.8–3.84 Control/OHT: =0.66
OHT/Gl: =0.01
(n=21) (n=49) (n=17) p Value
Cross sectional area (mm2):
mean (SD) 8.25 (1.67) 6.68 (2.58) 8.86 (2.08) Control/Gl: =0.004
 range 5.7–11.2 2.87–13.43 4.9–12.5 Control/OHT =0.57
OHT/Gl: =0.006

  • OHT = ocular hypertension; Gl = glaucoma.

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