Frequent redness that starts in one eye and then spreads to the other is usually due to conjunctivitis (often viral or allergic), rather than acidity. It can also be caused by allergic conjunctivitis, especially if there is itching or watering. Maintain eye hygiene, avoid touching or rubbing your eyes, wash hands frequently, and use clean towels. You can use lubricating eye drops for relief, but if redness keeps recurring, has discharge, or causes pain/vision issues, consult an eye doctor for proper treatment.