What corrective method focuses on enhancing the use of one eye by obscuring the other?

The correct choice, which is occlusion, involves a technique that enhances the use of one eye by obscuring or covering the other eye. This method is commonly used in vision therapy to treat various conditions, such as amblyopia (often referred to as "lazy eye"). By occluding one eye, it encourages the brain to rely more on the uncovered eye, thereby strengthening its visual capabilities.

This approach works on the principle that the visual system requires stimulation to develop properly, and by forcing the use of one eye, the therapy aims to improve visual acuity and coordination. The process can also help with issues like strabismus (crossed eyes), where the brain tends to favor one eye over the other due to misalignment.

Other options relate to different concepts in vision correction or evaluation. Fusion refers to the ability of the brain to combine the images from both eyes into a single, coherent one, essential for depth perception but not directly related to the corrective method in question. Optometry is the field focused on eye health and vision care but does not specify a corrective technique. Refraction is the process of measuring how light is bent by the eye to determine the prescription for corrective lenses, not specifically about occluding one eye.