The frequency of the compression of optic nerve by ICA
| Number of patients | Number of eyes | No Compression | Compression (%) | |||
|---|---|---|---|---|---|---|
| Grade 0 (%) | Grade 1 | Grade 2 | ||||
| NTG, normal tension glaucoma. | ||||||
| Control | 52 | 104 | 68 (65.4%) | 36 (34.6%) | 22 (61.1%) | 14 (38.9%) |
| NTG | 54 | 103 | 52 (50.5%) | 51 (49.5%) | 33 (64.7%) | 18 (35.3%) |