An apparatus for protecting a user s eye from blue light radiation is disclosed. The apparatus includes a radiation detector configured to convert blue light from a light source into a photo voltage having a voltage value a processor coupled to the radiation detector and configured to calculate a cumulative radiation intensity based on the voltage value cumulated over a time interval and to compare the cumulative radiation intensity with a threshold value and a controller coupled to the processor configured to adjustably control blocking of at least a portion of blue light from the user s eye when the cumulative radiation intensity exceeds the threshold value.
