Which parts of the eye are most important when it comes to focusing light so we can see a perfect image?

The parts of the eye that are most important when it comes to focusing light so we can see a perfect image would be the cornea and the retina. The retina forms the entire curved inside of the eyeball and is lined with two types of light-sensitive cells, the rods which are sensitive to light of low intensity but not to colors, and the cones which are sensitive to colors. Hope this answer helps.

Endurance would be my answer