“Which eye drops are best for a red eye?”

The answer to your question totally depends upon why is your eye red and what is the cause of the red eye? Most commonly, there are several types of red eye/conjunctivitis problems including viral, bacterial, and allergic and they are all treated differently. There are internal eye problems such as iritis which can cause red eyes. Scratched corneas can cause red eyes, ingrown eyelashes can cause red eyes, foreign bodies can cause red eyes, styes and pingueculas can cause red eyes, and a need for a corrective prescription can lead to having red eyes. I would see an eye doctor to have your red eye fully evaluated. Good luck and best wishes.

depends on cause