Final answer:
In vision screening, if a dedicated occluder is not available, a paper cup or a plastic spoon can serve as effective substitutes, as long as they cover the eye completely without allowing the student to peek.
Step-by-step explanation:
When performing vision screening, a good substitute for an occluder would be any item that can effectively block vision in one eye without putting pressure on the eyelid. Vision screening typically requires an occluder to cover one eye at a time. If a dedicated occluder is not available, a substitute could be the use of a paper cup or a plastic spoon held over the eye. It’s important to ensure that the eye is completely covered without allowing the student to peek through any gaps. The makeshift occluder should also be sanitized if it will be reused.