Illinois Vision Certification Practice Test

Which term is used to describe the obscuring of vision in one eye to improve the vision in the other?

1. Binocular vision

2. Occlusion

3. Fusion

4. Visual acuity

The correct answer is: Occlusion

The term that describes the obscuring of vision in one eye to improve the vision in the other is "occlusion." This technique is often used in the treatment of amblyopia, commonly known as "lazy eye," where one eye has weaker vision than the other. By covering or obscuring the stronger eye, the brain is encouraged to rely more on the weaker eye, facilitating improvement in its vision. In contrast, binocular vision refers to the ability of both eyes to work together to create a single, cohesive visual field. Fusion is the process of combining the two different images received from each eye into one perception, which is crucial for depth perception and spatial awareness. Visual acuity, on the other hand, is a measure of the clarity or sharpness of vision. While these terms are related to the overall function of vision, they do not specifically pertain to the practice of occlusion therapy aimed at enhancing vision in one eye.