What does near stereopsis mean without far stereopsis?

Stereoscopic vision loss, visual dysfunction.

1, lack of stereoscopic vision: both near stereoscopic vision and far stereoscopic vision are important components of stereoscopic vision. Only near stereoscopic vision has no far stereoscopic vision, which means that stereoscopic vision is lacking and the stereoscopic depth of distant objects cannot be correctly perceived.

2. Visual dysfunction: near stereoscopic vision without far stereoscopic vision means that lack of stereoscopic vision will lead to visual dysfunction, such as the inability to accurately judge the distance, depth and shape of objects, which will affect the visual perception and judgment ability in daily life and work.