What is the described treatment for phototoxic retinal damage caused by enrofloxacin?

• A. Laser therapy
• B. Steroid eye drops
• C. Oral antioxidants
• D. 'Blackout' treatment for two weeks

Answer: (D)

Phototoxic retinal damage from a light-activated drug happens because the drug in the retina reacts with light to form reactive species that injure photoreceptors and the pigment epithelium. The treatment described—protecting the eyes from light in a blackout for about two weeks—targets the root cause: by minimizing light exposure, you dramatically reduce further activation of the drug, limit ongoing oxidative injury, and give the retina time to recover. This approach is more directly aligned with the mechanism than other options. Laser therapy is aimed at physical retinal abnormalities, not a diffuse drug-induced phototoxic process. Steroid drops address inflammation rather than stopping the photochemical damage, and while antioxidants can be helpful in broader oxidative stress, they don’t stop light-triggered injury. In this scenario, removing the inciting drug and enforcing a period of dark/low-light exposure is the most appropriate management to allow healing.