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.