Visual Acuity Calculator
Free online visual acuity calculator. Enter your values and get instant results with the formula, step-by-step working, a worked example and FAQs — everything runs locally in your browser on Calcton, no signup required.
中文版：视力换算计算器
常用节点对照
5.0（1.0，20/20）标准 · 4.9（0.8）轻度下降 · 4.8（0.6）需验光 · 4.7（0.5，20/40）美国驾驶标准线 · 4.3（0.2）明显下降 · 4.0（0.1，20/200）重度
视力 ≠ 度数：裸眼视力与屈光度非线性关系，度数必须验光确定。矫正后仍 < 4.9 需排查弱视与眼底病变。
How to use the Visual Acuity Calculator
- Fill in the inputs with your own numbers — every field shows what it expects.
- The result updates instantly as you type; no "Calculate" click needed.
- Read the result card for the main figure, the step-by-step formula, and practical notes.
Frequently asked questions
Is the Visual Acuity Calculator free?
Yes — all health calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.
Is there a Chinese version of this tool?
Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.
References
Formulas and benchmarks used by this calculator follow these published sources.
KevinContent LeadCalcton Editorial Team · Last updated 2026-06-06
Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.
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