Obstacle Negotiation in Older People With and Without Vision Impairment

"In the walking trials, when an obstacle is present, the obstacle height and obstacle contrast level will be varied across the trial repetitions.~Each participant will be exposed to obstacles of two heights: the first will be 1 centimeter in height, and the second will be approximately 20% of the subject's leg length (ranging in physical height between 15 - 22 centimeters to cover a range of leg lengths in the population).~Obstacles (of both heights) will also be painted such that their measured luminance (or contrast) level against the floor luminance is varied. High contrast obstacles will have ≥80% Michelson contrast and low contrast obstacles will have ≤30% Michelson contrast."