title: Scleral canal size and optic nerve head drusen.
abstract: From projected optic disk photographs we measured the size of the scleral canal in two samples of emmetropic patients: one of patients with unilateral pseudopapilledema and drusen and the other of the general normal population. Measurements on the non-drusen-containing optic disk of patients with unilateral drusen were taken to reflect the scleral canal size of the fellow, affected eye. For both trained (t = 6.642) and untrained (t = 4.274) observers, the average diameters of the non-drusen-containing optic disks of patients with unilateral drusen were significantly smaller than those of the optic disks of normal patients (P = .0005, one-tailed independent t-test). The association of a small scleral canal with vascular anomalies, frequently noted in optic disks of patients with drusen, indicates a mesodermal dysgenesis of the optic nerve head.
mesh_terms: D000328:Adult; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D008297:Male; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000473:pathology; D010211:Papilledema / Q000473:pathology; D012031:Refractometry; D012590:Sclera / Q000473:pathology*