optic flow
光流感，指观察者（或观察点）与环境发生相对运动时，视网膜上呈现的视觉运动模式。在 HCI/UX 设计中常被用作传达速度、方向或运动状态的感知线索。
English Definition
"The pattern of visual motion across the retina caused by relative movement between an observer and the environment, used in HCI/UX as a perceptual cue to communicate speed, direction, or motion."
用法说明 · 针对中文母语者
在 VR、自动驾驶、晕动症研究中经常出现。注意区分 'natural optic flow'（自然光流）与通过界面/显示人为制造的 'simulated optic flow'。
真实用例 · 3 条
"providing the rear seat passenger with a visual pattern providing lateral optic flow to indicate instantaneous actual vehicle speed"
"the pattern was representative of the optic flow pattern that would be perceived from the outside environment if the door card would be transparent"
"The direction of the LED lights was programmed to simulate the natural optic flow, i.e. forward motion of the vehicle corresponded to movement of the visual pattern from front to rear of the vehicle."