"Scene description" applications that describe visual content in a photo are useful daily tools for blind and low vision (BLV) people. Researchers have studied their use, but they have only explored those that leverage remote sighted assistants; little is known about applications that use AI to generate their descriptions. Thus, to investigate their use cases, we conducted a two-week diary study where 16 BLV participants used an AI-powered scene description application we designed. Through their diary entries and follow-up interviews, users shared their information goals and assessments of the visual descriptions they received. We analyzed the entries and found frequent use cases, such as identifying visual features of known objects, and surprising ones, such as avoiding contact with dangerous objects. We also found users scored the descriptions relatively low on average, 2.76 out of 5 (SD=1.49) for satisfaction and 2.43 out of 4 (SD=1.16) for trust, showing that descriptions still need significant improvements to deliver satisfying and trustworthy experiences. We discuss future opportunities for AI as it becomes a more powerful accessibility tool for BLV users.

翻译：能够描述照片中视觉内容的"场景描述"应用是盲人与低视力（BLV）人群的日常实用工具。现有研究已对其使用情况展开调查，但仅关注了依赖远程视力协助者的应用；对于采用人工智能生成描述的应用，人们知之甚少。为此，我们通过为期两周的日志研究，邀请16位BLV参与者使用我们设计的AI场景描述应用，以探究其使用场景。通过日志记录与后续访谈，用户分享了其信息需求以及对所获视觉描述的评价。分析发现存在高频使用场景（如识别已知物体的视觉特征）与意外使用场景（如规避危险物体接触）。用户对描述质量的评分普遍偏低：满意度平均分2.76（标准差1.49，满分5分），信任度平均分2.43（标准差1.16，满分4分），表明现有描述仍需显著改进才能提供令人满意且可靠的使用体验。随着AI逐渐成为更强大的无障碍辅助工具，本文进一步探讨了其未来发展方向。