Table 2

Abnormality of nerve fibre layer circumpapillary clock hours on optical coherence tomography, by glaucoma diagnosis

Clinician diagnosisNumber of eyesAbnormal superiorAbnormal inferiorAbnormal either superior or inferior
2 hours1 hour2 hours1 hour2 hours1 hourTotal 2+1 hour
Definite GON, n (%)1271143 (11)397 (31)497 (39)381 (30)555 (44)470 (37)1025 (81)
Probable GON, n (%)5166 (1)92 (18)24 (5)115 (22)30 (6)165 (32)195 (38)
Not GON, n (%)5893 (1)28 (5)1 (0)34 (6)4 (1)54 (9)58 (10)
  • Total 2+1 hour=number of eyes with either 1 or 2 clock hours abnormal either superior or inferior. Clock hour data not available for some imaging devices.

  • GON, glaucomatous optic neuropathy.