Analysis of Retinal Nerve Fiber Layer Thickness of Superior Segmental Optic Hypoplasia and Normal-Tension Glaucoma

PURPOSE: To analyze the peripapillary retinal nerve fiber layer (RNFL) in superior segmental optic hypoplasia (SSOH) patients and normal tension glaucoma (NTG) patients with inferior visual field defects using optical coherence tomography (OCT). METHODS: Ten eyes of 10 patients with SSOH and 10 eyes of 10 patients with NTG were evaluated. The peripapillary RNFL thickness measured by OCT was compared between the 2 groups. RESULTS: The mean RNFL thickness was not significantly different between SSOH patients (79.60 +/- 12.54 micrometer) and NTG patients (77.10 +/- 8.52 micrometer) (p = 0.089). Among the quadrant parameters, there were no significant differences between the 2 groups (p > 0.05). In a clock-hour analysis, the peripapillary RNFL thickness of the NTG group was significantly thicker than the SSOH group in 12, 1, and 2 o'clock (p = 0.029, 0.007, 0.043, respectively). In contrast, the peripapillary RNFL thickness of the SSOH group was significantly thicker than the SSOH group in 6, and 7 o'clock (p = 0.029, 0.007, respectively). CONCLUSIONS: Peripapillary RNFL thickness in patients with SSOH was thinner than in those with NTG in the superonasal region, but thicker in the inferotemporal region indicating a different retinal nerve fiber defect pattern between the 2 diseases.

Analysis of Retinal Nerve Fiber Layer Thickness in Patients With Superior Segmental Optic Hypoplasia

PURPOSE: To analyze the thickness of the peripapillary retinal nerve fiber layer (RNFL) in patients with superior segmental optic hypoplasia (SSOH) using optical coherence tomography (OCT). METHODS: Ten eyes of 10 patients with SSOH and 20 eyes of 20 subjects as normal control were evaluated. The peripapillary RNFL thickness measured by Stratus OCT was compared between the two groups. RESULTS: The mean RNFL thickness was significantly different between SSOH patients (72.35+/-14.77 micrometer) and normal subjects (111.61+/-6.62 micrometer) (p<0.001). The extent to which the RNFL thickness was below 5 percentile of normal subjects on the TSNIT graph was from the 41.7+/-15.53 to 110.1+/-7.47 scan number, which corresponded mainly with the superior nasal region. Moreover, in a clock-hour analysis, the peripapillary RNFL thic kness of the SSOH patients decreased significantly from 10 o'clock to 6 o'clock compared to normal subjects (p<0.01). CONCLUSIONS: Peripapillary RNFL thickness in patients with SSOH was reduced in the superior, nasal, and inferior regions. Further studies involving larger populations of patients should be performed to verify these findings.