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Free visual field accessibility calculator. Get effective coverage %, a peripheral load score (0–100), and Good / Caution / Poor level. Pair with screen magnification when users zoom critical UI.
Last updated: May 24, 2026
Need contrast on clustered controls? Contrast ratio calculator
Effective Coverage
65.8%
Peripheral Load Score
50/100
Accessibility Level
Caution
Reduce peripheral spread of key controls and cluster essential elements toward central focus.
Planning aid only. Validate final layout accessibility with real-user testing and assistive-technology sessions.
We can build and embed a custom version of Visual Field Accessibility Calculator for your brand and workflow.
Answers: does critical UI fit in the visual field, peripheral load from wide dashboards, and how UI density raises search effort.
Default 62.5° available vs 95° spread → 65.8% coverage.
Default load 50 — Caution band (35–64).
Actionable recentralization guidance per band.
Default: 70° horizontal · 45° vertical · 95° critical spread · moderate density → available 62.5° · coverage 65.8% · load 50/100 (+16 density) · Caution.
Effective Coverage
65.8%
Peripheral Load
50/100
Level
Caution
| Context | Horizontal | Vertical | Note |
|---|---|---|---|
| Typical full field (approx.) | ~120–140° | ~60–75° | Functional usable field is often smaller |
| Restricted / low vision planning | 50–80° | 30–50° | Use clinician or user-reported functional degrees |
| Calculator default | 70° | 45° | Weighted available = 62.5° |
| Density | Load add-on | Note |
|---|---|---|
| Low | +8 pts | Sparse UI — less visual search clutter |
| Moderate | +16 pts | Default dashboard-style density |
| High | +26 pts | Dense panels, badges, side rails |
| Load score | Level | Meaning |
|---|---|---|
| 0–34 | Good | Critical content likely fits functional field with manageable search |
| 35–64 | Caution | Tighten spread or reduce density before release |
| 65–100 | Poor | Recentralize task-critical UI; expect missed peripheral controls |
Layout-planning heuristic for low vision and restricted field — validate with user testing and assistive technology workflows.
availableField = horizontal°×0.7 + vertical°×0.3coverage% = min(100, availableField ÷ spread × 100)peripheralLoad = round(100 − coverage% + densityPenalty)level = load <35 Good · <65 Caution · else PoorCoverage 65.8% · load 50 · Caution (not 65.3% / 51).
Coverage 60.5% · load 55 · Caution.
Coverage 100% · load 8 · Good.
Coverage 100% · load 8 · Good.
Coverage 36.7% · load 89 · Poor.
Coverage 65.8% · load 60 (+26 vs +16 moderate) · Caution.
Coverage 54.4% · load 62 · Caution.
Share with accessibility designers, low-vision researchers, and product teams auditing dashboard spread.
Suggested hashtags: #Accessibility #LowVision #InclusiveDesign #UX #WCAG