Nägemissüsteemi

Nägemissüsteemi, also known as the visual system, is a complex network of structures and processes in the human body that enables sight. It consists of the eyes, the optic nerves, and the visual centers in the brain. The eyes capture light and convert it into electrical signals through a process called photoreception. These signals are then transmitted to the brain via the optic nerves, where they are processed and interpreted as images.

The visual system can be broadly divided into two main pathways: the dorsal (or "where") pathway and the ventral (or "what") pathway. The dorsal pathway is responsible for spatial awareness and the perception of motion, while the ventral pathway is involved in object recognition and color perception.

The visual system is highly adaptable and can adjust to various lighting conditions, a process known as accommodation. It also has the ability to perceive depth, a phenomenon called stereopsis, which is achieved through the slight differences in images received by each eye.

The visual system is crucial for various activities, including navigation, communication, and social interaction. It plays a significant role in our daily lives and is essential for many aspects of human cognition and behavior. However, like any other system in the body, the visual system can be affected by various conditions, such as eye diseases, neurological disorders, and visual impairments.