Answer
Damage to the left optical tract will cause loss of complete right field of vision.
Work Step by Step
The light from the left field of vision falls on the medial side of the left eye's retina and lateral side of the right eye's retina. Similarly, light from the right field of vision falls on the medial side of the right eye's retina and the lateral side of the left eye's retina. The axons from the medial side of both eye's retina cross over to the other side at optical chiasma. So the left optical tract contains the entire input of the right field of view, and the right optical tract contains the entire input of the left field of vision. So damage to one side of the optical tract will result in the loss of the entire field of vision of the opposite side.
