It really depends on the amount and duration of exposure. Eg lasers that are pulsed won’t warm or irritate tissue as much as continuous radiation. Some energy i

It really depends on the amount and duration of exposure. Eg lasers that are pulsed won’t warm or irritate tissue as much as continuous radiation. Some energy is also absorbed by the eyeball before it reaches the retina. The wavelength also plays a part, with some wavelengths penetrating water (=tissue) better than others. Laser light is more powerful than eg ordinary LED light because the emitted photons act coherent (possible in both the spatial and temporal dimensions), so they are more efficient heating things up, or reacting with chromophores in cells. But if the energy arriving at the retina is low enough, this will be no issue.