Final answer:
The retina is the structure that can become detached due to a blunt force to the eye, which can severely impair vision. It is treated with laser surgery that creates scar tissue to hold the retina in place.
Step-by-step explanation:
The structure at the back of the eye that can tear and become detached due to a blunt force is called the retina. It is within the neural tunic of the eye and contains layers of cells, including ones that respond to light. If the retina becomes detached, it can lead to significant vision impairment. Treatment often involves laser surgery, where a focused laser burns a small spot on the retina and the resulting scar tissue helps to hold it in place. The lens of the eye plays a crucial role in focusing light onto the retina during this procedure.