Visual toys for children under 3 years old are designed to develop children's visual cognition and eyesight. Such toys may contain colorful and high-contrast patterns, shapes, colors and lights to attract children's attention and stimulate their visual processing. Examples of visual toys can include mobiles, mirrors, picture books with clear images and colors, and toys with bright colors and lights. Playing with visual toys can help children improve their visual processing and cognition, develop their cognitive skills and enhance their self-confidence. Visual toys can also help support children with visual impairments or other vision problems by helping them improve their eyesight and train their visual cognition. Parents and educators can use visual toys to provide children with a fun and interactive way to enhance their visual cognition and promote their development.