Understanding the Farnsworth-Munsell 100-Hue Score
Purpose
The Farnsworth-Munsell 100-Hue test reviews hue discrimination. A person arranges colored caps in a smooth order. The score reflects how far each cap sits from its correct neighbors. Lower values usually show better ordering skill. Higher values show more hue confusion.
Scoring Logic
This calculator uses neighbor based scoring. Each cap is compared with the cap placed before it and after it. Perfect neighboring gives zero error. Swaps create local error around the moved caps. Large jumps create larger scores. The total error score adds every cap score.
Tray Review
The four trays divide the hue circle into practical sections. Tray totals help locate where most mistakes occur. One tray may carry most of the load. Another tray may be almost perfect. This pattern can guide retesting and lighting checks.
Advanced Interpretation
The accuracy index normalizes the total error score against a reference maximum. It is not an official medical grade. It is useful for comparison between practice runs, students, workers, or quality checks. Use the same reference value each time.
Quality Checks
Valid data is important. Missing caps, repeated caps, or caps in the wrong tray can distort the result. The calculator lists these warnings after submission. Correct the sequence first, then score again. Consistent lighting and viewing distance also matter.
Practical Use
This page is useful for classrooms, screening notes, occupational checks, and research logs. It can store observer details, cap order, tray totals, severity bands, and export reports. The CSV file helps spreadsheet analysis. The PDF file gives a simple record for review.
Important Note
Color vision results need professional context. Age, eye health, fatigue, glare, lighting, and monitor conditions may affect performance. This tool supports calculation only. It does not diagnose color vision deficiency. For clinical decisions, use a qualified examiner and controlled test materials.