Hybrid perimetry: a blend of static and kinetic techniques

A new hybrid perimetry technique is proposed that combines elements of kinetic and static methods. The stimulus is presented in stationary flashes, as in static perimetry, but successive flashes are moved progressively across the retina to map isopters, as in kinetic perimetry. Tests with a Tübingen perimeter show that the three methods provide similar estimates of sensitivity and variability for normal subjects. The hybrid method requires about the same time to determine an isopter point as the static method requires to determine a threshold. However, the hybrid method tests a larger retinal area in that time than the static method while providing an isopter measurement that is free of the reaction time artifacts characteristic of the kinetic method. Comparisons of photopic and scotopic hybrid fields show that one well-chosen scotopic isopter can provide as much information as three photopic isopters.