1. 视觉：视阈测量measurement of visual area | 视觉visual sensation | 评定等第rating

2. 视觉感：visual selection == 目测选种 | visual sensation == 视觉感 | visual sense == 视觉=視覚

noun

1. the perceptual experience of seeing

e.g. the runners emerged from the trees into his clear vision
he had a visual sensation of intense light

Synonym: vision