What visual acuity in an eye qualifies an athlete as functionally one-eyed?

An athlete is considered functionally one-eyed when they have reduced vision in one eye that significantly impacts their ability to participate in certain sports safely. For this classification, visual acuity of 20/40 in one eye is typically the threshold. This level of acuity indicates that the individual’s ability to see detail is diminished, making it difficult for them to judge distances and perceive spatial relationships as effectively as someone with better vision.

In contrast, visual acuities of 20/20, 20/30, and 20/50 either represent normal vision or varying degrees of visual impairment that are not typically classified as functional blindness or significant enough to categorize an athlete as functionally one-eyed. An acuity of 20/30 is still considered relatively good vision, while 20/50 indicates more pronounced visual impairment but does not meet the threshold set for functional one-eyed status. Thus, 20/40 serves as the correct designation for classification in this context.