Illinois Vision Certification Practice Test

What is the primary purpose of Occlusion in vision therapy?

1. To improve color perception

2. To obscure the vision of one eye, forcing use of the other

3. To enhance depth perception

4. To prevent glare from light

The correct answer is: To obscure the vision of one eye, forcing use of the other

The primary purpose of occlusion in vision therapy is to obscure the vision of one eye, thereby encouraging the use of the other eye. This technique is particularly beneficial for individuals with amblyopia, commonly known as "lazy eye," where one eye does not develop proper vision. By covering the stronger eye, the therapy effectively stimulates and strengthens the weaker eye by forcing it to work harder. This method can lead to improved vision in the amblyopic eye and promote better overall visual function. Other choices address various aspects of vision but do not align with the specific function of occlusion in therapy. Enhancing color perception or depth perception is more related to different aspects of visual processing rather than the direct goal of occlusion. Preventing glare focuses on improving comfort and visibility in bright conditions, which is unrelated to the therapeutic aim of occlusion. Hence, occlusion specifically targets the imbalance in eye usage, making the selected choice the clear purpose of this therapy.