Fortunately it was just a minor injury.
On July 22nd, according to SM Entertainment, Sunny got hit by a car door in her left eye on July 20th. She was later transferred to a hospital and received treatment. Thought she wasn't seriously injured, but because her eye became bloodshot she was advised to wear an eye patch.
SM Entertainment also consoled the fans by saying that the injury won't interfere with her schedules and daily activities, in particular she is currently recording for MBC's 'Wishing Star' as planned today.
We wish you a speedy recovery Sunny!