Figure 2 Acute UV‐blue¹⁰,¹²,⁷³ and lipofuscin²³,²⁵ phototoxicity rise rapidly in the violet part of the spectrum, where porphyrin²³,⁵⁶ and cytochrome oxidase²³,⁵⁸ phototoxicities peak and macular xanthophyll protection declines.⁷⁵ Conversely, as shown in figure 1, violet light is much less important than blue light for circadian photoentrainment and vision in dim environments.