I use the See-Green system to insert my scleral lenses. When using the plastic stand (in the more expensive See-Green kit), I can use both hands to hold open my eyelids, the plunger holding the filled lens is stable, and the green light lets me line up my eye with the lens. I bought this kit as a spare. I don't expect the plastic stand to wear out, so I'm glad I could buy just an extra inserter to have on hand in case my original inserter ever dies. I would be lost without it, and wouldn't want to have to wait to ship a new one out. My original See-Green has been working reliably for months now. If you struggle to insert your lenses, this product is the most helpful thing I've found. If this is your first purchase of this device, I'd recommend you get the kit with the stand.