The normal age-corrected and reaction time-corrected isopter derived by semi-automated kinetic perimetry
Abstract
PURPOSE: To determine the increase in isopter extent, resulting from the measurement of, and correction for, individual reaction time (RT; the latency between stimulus presentation and individual patient response), derived under the standardized conditions of semi-automated kinetic perimetry (SKP), and to model the age- and RT-corrected normative isopter values for SKP applicable to any Goldmann stimulus combination.
DESIGN: Cross-sectional observational study.
PARTICIPANTS: Eighty-three healthy participants aged 10 to 80 years (11-12 participants per decade of age).
METHODS: One eye of each participant underwent SKP using the Octopus 101 perimeter (Haag-Streit, Koeniz, Switzerland). Four Goldmann stimulus combinations, III4e at 25 degrees/second, III4e at 5 degrees/second, I3e at 5 degrees/second, and I2e at 2 degrees/second, were presented centripetally (i.e., in a direction toward the center of the bowl) along the 8 cardinal meridia in random order. The local kinetic threshold (LKT) for each stimulus combination along each meridian was corrected for the angular distance traveled during the individual geometric mean RT and was modeled in terms of the covariables stimulus size, stimulus luminance, meridian, and age, and then presented in terms of a graphical reference plot.
MAIN OUTCOME MEASURES: The variation of the LKT with RT, stimulus combination, meridian, and age.
RESULTS: The median of the individual geometric mean RTs initially decreased and then increased with…
How strong is the evidence?
Evidence Hub reads this as a cross-sectional, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause. Reported size: 12 participants or records.
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