I use Lacrilube for my girls...A gel works much better then any of the liquids...Lacrilube is an OTC...I also used cyclosporin ung for Izzy before her enucleation...it was pricey but really helped her be comfortable...I would question $600 for a schirmer test...even with a visit to the ophthalmologists and having full work-ups done I don't pay that much for the wees...