Oct 25, 2016 · A feline’s eyes can become red for a number of reasons. Trauma, allergies, obstructions, structural changes of the eye, disease, viral infections, bacterial infections, and irritants can all cause the eye of a cat to become red. The most common causes of red eye in cat include: Trauma. Scratches; Bites; Pokes; Allergens; Pollen; Dust; Bee