What could happen if a person looks directly into a black light?

Looking directly into a black light can indeed cloud a person's vision temporarily. Black lights emit ultraviolet (UV) light, which is not harmful in low doses but can cause temporary visual disturbances such as glare or afterimages, making it difficult to see clearly for a short period. This can occur because the eye's photoreceptors react to the brightness of the UV light, which can overwhelm the visual system momentarily.

While the other options suggest effects such as permanent damage or improved vision, the most immediate and commonly experienced effect is the temporary clouding of vision. It's important to consider that while prolonged exposure to UV lights can lead to greater risks, such as eye damage over time, a single momentary glance would primarily result in a temporary impact on vision rather than lasting harm.