These rewetting eye drops are something more than regular eye drops - they are considered to be eye rinsing solution, which means that you can rinse your whole eye with them when it feels irritated or you've got some dust in it. Hydrabak eye drops are great in situations of emergency like that, but they also serve well as refreshing eye drops preparing your eyes for contact lenses and then soothing them afterwards. Thanks to a specially designed bottle, they have a long lifespan, which means you can use them occasionally and still use the whole bottle.
This is a medical device.
Use it according to the instructions for use or the label.