Define the following terms:
$(i)$ Snow blindness
$(ii)$ Ozone hole

(N/A) $(i)$ Snow blindness: It is a painful condition of the eyes caused by high exposure to ultraviolet-$B$ $(UV-B)$ radiation. The $UV-B$ radiation causes inflammation of the cornea,which leads to temporary blindness.
$(ii)$ Ozone hole: It refers to the significant thinning of the ozone layer in the stratosphere,particularly over the Antarctica region. This depletion is primarily caused by the release of chlorofluorocarbons $(CFCs)$ into the atmosphere,which react with ozone $(O_3)$ and break it down into oxygen $(O_2)$.