Refresh Optive Lubricant Eye Drops Single-Use Vials, 60 Count

Q: Can this be used for contact lens?

Yes they can be used with contact lens, I've been using them for years while wearing my contacts. Before I began using them I called the company to confirm that they can be used with contacts. :-)

Q: What are the ingredients?

One of the other reviewers, Sukie D., listed the inactive ingredients. The active ingredients are carboxymethylcellulose sodium .5% and glycerin .9%. Hope this helps.

Q: does this contain castor oil?

I don't think so. I checked the box for the active and inactive ingredients list and didn't find it listed.

Q: Are these reusable. Or can the cap be replaced. I wish the pictures included better pictures of rather actual vials.

The cap can ABSOLUTELY be replaced. If you have some drops left, you can just snap the cap right back on (don't keep an open vial for more than a day, though). I've been doing this for years now and actually carry it in my pocket that way and use it throughout the day. Look closely at the vial in the picture. The lip right under the twist-off cap is there for a reason. That's what the cap snaps on to.