视觉 (shì jué) literally combines 视 (shì), meaning 'to look' or 'to see', and 觉 (jué), meaning 'perception' or 'sensation'. Together, they refer specifically to the physiological and psychological sense of sight—the ability to detect and interpret visual information from light entering the eyes. It is a formal, scientific term used in medicine, psychology, biology, and design—not typically found in casual speech where people might simply say 看 (kàn) or 眼睛看 (yǎn jing kàn).

This word emphasizes vision as a sensory modality, often contrasted with other senses like 听觉 (tīng jué, hearing) or 触觉 (chù jué, touch). It appears frequently in discussions about human anatomy, visual impairments, optical illusions, accessibility design, and even animal perception—e.g., comparing human visual acuity with that of eagles or bees. Because it’s abstract and technical, it rarely stands alone; it’s usually modified by adjectives (e.g., 正常视觉, 'normal vision') or used in compound terms like 视觉系统 (visual system) or 视觉障碍 (visual impairment).