ULTRAVIOLET RADIATION AND THE EYE - Environmental UV Radiation: Impact on Ecosystems and Human Health and Predictive Models - page 256

Figure 3. Spectral absorption of UV radiant energy within ocular structures.
integrated radiance limit L B is 20 J/(cm 2 ǜsr) averaged over a right circular cone of 0.011
radian for durations up to 10 4 seconds (2.8 hours); although a larger averaging angle is
generally used for durations of the order of 1000 s or greater where a non-fixation visual
task is involved. Normally the cornea, aqueous, and crystalline lens absorb 99% or more
of the UVE that could enter the eye (as shown in Figure 3). The B(Ȝ) function has a
Figure 4. Action spectra.