Answer:
Macular Degeneration
Step-by-step explanation:
Macular degeneration is a disease that affects the central portion of the retina (macula), responsible for capturing visual details. Its main symptoms are progressive loss of central vision, visual distortion of straight lines and decreased color sharpness. As Thomas's doctor suspects that the blood vessels in the central region of his retina are being progressively damaged, we can predict that Thomas may be suffering from macular degeneration.
Macular degeneration usually occurs in people over 50 and is related to retinal wear. The disease usually affects both eyes, but not at the same time. Often one eye is already at an advanced stage, with significant loss of vision, and the other is at an early stage.