"block vision" is a correct and usable phrase in written English.
It can be used to describe something that is preventing someone from seeing clearly or obstructing someone's view. Example: The tall building blocks the vision of the mountains from the city skyline. In this sentence, "blocks the vision" is used to describe how the building is obstructing the view of the mountains.
*Wear slip-resistant shoes and make sure hats or scarves do not block vision.
The physical correlate is the proportion of views covered by physical features which block vision or motion.
In all of these, space is defined by ground or floor surfaces below, obstacles that block vision horizontally or terminate it at the horizon, and sky overhead.
In the first set, the multiple correlation between Station Point and Abstract estimates of proportion of views covered by features which block vision or motion was R=0.92.
To block vision of the reflected upper arm and the body, two black curtains hung from rods on each side of the mirror box.
In his experiments, he imposes sensory deficits on test subjects, using goggles to block vision at selected times during the manipulation to interfere with the subjects' abilities to learn and execute grasping tasks.
With it, the vessels bleed, and scar tissue is formed, blocking vision.
For example, if a patient experienced an internal eye bleed, or hemorrhage, which totally blocks vision, clinicians tried surgery, the customary way to resolve a hemorrhage.
Second, an active blanking-off process, known as saccadic suppression, occurs, and this blocks vision for the first part of each saccade.
The opening section, describing his life and crimes in London at the end of the 18th century, is all blocked vision, "the alleyways no more than a stride across, and dimmed even on the brightest day".
Ericsson's technology builds upon the Asulab's invention of multiple displays where one is superimposed on another, blocking vision of the second display.
