I looked into that for VR headset eye tracking, which uses IR lights plus cameras to see the eyes inside the dark headset.
Here someone did some calculations [0].
> The International Commission on Non-Ionizing Radiation Protection's Guidelines of limits of exposure to broad-band incoherent optical radiation (0.38 to 3 µm)[1] states:
> "To avoid thermal injury of the cornea and possible delayed effects on the lens of the eye (cataractogenesis), infrared radiation (780nm < > λ < > 3μm) should be limited to 100 W m⁻² (10 mW cm⁻²) for lengthy exposures (> 1000 s)"
Here someone did some calculations [0].
> The International Commission on Non-Ionizing Radiation Protection's Guidelines of limits of exposure to broad-band incoherent optical radiation (0.38 to 3 µm)[1] states:
> "To avoid thermal injury of the cornea and possible delayed effects on the lens of the eye (cataractogenesis), infrared radiation (780nm < > λ < > 3μm) should be limited to 100 W m⁻² (10 mW cm⁻²) for lengthy exposures (> 1000 s)"
0: https://docs.eyetrackvr.dev/getting_started/led_safety#about...
1 (pdf): https://docs.eyetrackvr.dev/safety/ICNIRP_optical_radiation....