Why is an ozone hole formed over Antarctica? How will enhanced ultraviolet radiation affect us?

(N/A) The depletion of the ozone layer in a restricted area is known as an ozone hole. It was first discovered over Antarctica. The air over Antarctica is isolated from the rest of the world by a phenomenon called the polar vortex. $CFCs$ released into the atmosphere gradually reach the stratosphere,and winds transport them toward the polar regions. The atmospheric conditions prevailing in Antarctica during winter months facilitate the formation of the ozone hole. The lack of sunlight and extremely low temperatures during winter lead to the formation of ice clouds,which provide a catalytic surface for chlorine reactions. $UV-B$ radiation is highly harmful. The cornea of the human eye absorbs $UV-B$ radiation,and a high dose of this radiation causes inflammation of the cornea,a condition called 'snow blindness' or cataract,which can lead to permanent damage to the cornea. $UV-B$ radiation also damages skin cells and causes skin cancer.