Answer
Henri's condition is most likely due to a genetic eye disease called retinitis pigmentosa. Retinotoxic drugs can also cause the damage of the retina present in Henri's eyes. However, the dark pigment spots on the retina indicate a diagnosis of retinitis pigmentosa. People with this congenital disease also experience loss of night vision, as Henri did.
Work Step by Step
Henri's loss of night vision is most likely due to the congenital eye disease known as retinitis pigmentosa. This determination is made on the basis of dark pigment bands on the retina in addition to the loss of night vision.
