Period prevalence and incidence of optic disc @entity548 in normal tension XXXX and primary @entity1538 .

@entity1 @entity725 @entity1538 @entity548 @entity726
BACKGROUND: To investigate and compare the period prevalences and incidences of optic disc @entity548 in normal tension @entity726 and primary @entity1538 . DESIGN: Hospital-based retrospective study. @entity1 : Four hundred and four @entity1 with normal tension @entity726 and 210 @entity1 with primary @entity1538 that underwent consecutive disc examinations at least quarterly for at least 1 year and stereoscopic optic disc photographs at intervals of 6 to 12 months between 1992 and 2007. METHODS: The period prevalence of disc @entity548 , gender predominance among @entity1 with disc @entity548 , and cumulative incidence of normal tension @entity726 and primary @entity1538 were compared. MAIN OUTCOME MEASURES: Period prevalence, cumulative incidence, and gender predominance of DHs in @entity1 with NTG and @entity725 . RESULTS: Three hundred and eighty-seven @entity1 (387 eyes) of normal tension @entity726 @entity1 and 205 @entity1 (205 eyes) of primary @entity1538 @entity1 were finally enrolled in the study. The period prevalence and incidence rates of the stereoscopic optic disc photograph-confirmed glaucomatous disc @entity548 were 33.3% (129/387), 0.46    0.18 times/year in the normal tension @entity726 group, and 17.6% (36/205), 0.34    0.23 times/year in the primary @entity1538 group, respectively. The absolute values and ratios of primary @entity1538 and normal tension @entity726 in period prevalences and incidence rates in the present study were higher than in previous studies. No significant difference in gender ratios was found between @entity1 that did or did not develop disc @entity548 for both types of @entity1538 (P > 0.05, respectively). CONCLUSIONS: The primary @entity1538 group had higher period prevalences and incidence rates of disc @entity548 than those reported previously. Disc @entity548 were found to develop independent of gender.
