Conventional visual field testing requires continuous central fixation, which is often impossible or highly fatiguing for many patients. This preprint introduces the 180° Scanning Grid, a novel manual diagnostic tool that eliminates the need for sustained central fixation. The system employs symmetric 180° coordinates and a single rotation step to produce an accurate map of scotomas or distortions with high patient autonomy, minimal fatigue, and no medical supervision. **Clinical Relevance (2026 context)** In an era of rising age-related macular degeneration prevalence (projected 288 million cases globally by 2040) and growing emphasis on patient self-monitoring, this zero-cost, paper-based tool directly addresses a long-standing limitation of traditional Amsler testing. Full preprint (5 pages) with grid design, method, advantages, and Figure 1 (before/after 180° rotation).
Kevin Bleep (Tue,) studied this question.