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Table 1 Sunglasses category limits, adapted from ISO 12312-1:2013

From: Are sunglasses appropriate for driving? Investigation and prototype for public testing

Filter category Visible spectral range
Range of luminous transmittance \(\tau_{\mathsf{v}}\) 380–780 nm
0 \(\tau_{\mathsf{v}}\) > 80%
1 43% < \(\tau_{\mathsf{v}}\) ≤ 80%
2 18% < \(\tau_{\mathsf{v}}\) ≤ 43%
3 8% < \(\tau_{\mathsf{v}}\) ≤ 18%
4 3% < \(\tau_{\mathsf{v}}\) ≤ 8%