Evaluating semi-automated kinetic perimetry in persons with idiopathic intracranial hypertension

BackgroundThis study aimed to assess whether semi-automated kinetic perimetry (SKP) enables the quantitation and monitoring of visual field loss in persons with idiopathic intracranial hypertension (PWIIH).MethodsWe conducted a retrospective review of newly diagnosed PWIIH. We recorded baseline clinical data and optic disc modified Frisén grade from fundal photographs. The SKP software calculated the I4e and I2e isopter areas and the I4e target plotted blind spot areas. This was recorded for each eye at baseline and for each study visit for up to 1 year.ResultsBoth the baseline I4e isopter (F = 44.1, <i>p</i> < 0.001) and I2e isopter areas (F = 37.1, <i>p</i> < 0.001) were significantly related to baseline visual acuity. The baseline blind spot area was significantly related to modified Frisén grade (F = 22.0, <i>p</i> < 0.001). There was no significant linear relationship between either the I4e isopter (F = 0.06; <i>p</i> = 0.939) or I2e isopter areas (F = 0.06, <i>p</i> = 0.807) and the time since diagnosis. There was, however a significant linear decrease in mean blind spot area over time (F = 46.6, <i>p</i> < 0.001).ConclusionsThe relationships at baseline between I4e and I2e isopter areas and visual acuity show that SKP provides clinically meaningful results at presentation in PWIIH. Our results suggest that it is less useful for monitoring recovery.