My opinion mainly a way of sucking more money out of the pocket of patients and insurance companies. Plus once you buy this you have to get patients to use it in order to pay for it. There is a big movement now in optometric and ophthalmology circles to proclaim oneself 'Dry Eyes Center of Excellence" and this supposedly can addd $500K to $1M extra revenue/year. I think it is a racket. A careful history, artificial tears, tear duct pugs, omega 3 use, environmental modification, and if needed Restasis (the new Xiidra is wildly expensive) can handle 99% of the patients. Below is a previous post on dry eyes:
General Information on Dry Eyes-Now known as Tears Dysfunction Syndrome or Ocular Surface Disorder.
a Schirmer test of zero indicates that you have severe dry eyes. I'm assuming from your posting that you have tried both preserved and unpreserved artifical tears, gels or lubricating ointments at bedtime, environmental modification, etc. Don't discount eye drops. There are over a 100 different brands of artificial tears and they can't all be lumped together. Sometimes one will find the perfect drop. Because the problem is so prevalent the pharmaceutical compies are coming out with new products all the time. Some of the newest are Systane preserved and unpreserved drops and Optive drops. Eye drops for dryness are classified as preserved drops (individual vials that must be used within 24 hrs), preserved drops, gels and ointments. The preserved drops are more expensive and usually only help the small percentage of people that are really allergic to preservatives. Gels and ointments are normally used at night since regular tears won’t last all night. There is also an over the counter spray for dry eyes called “Tears Again”. Tears may need to be used as often as 6 times/day.
If you took Restasis you have used the best prescription medication. A "trial" of Restasis is a minimum of 3 to 4 months of therapy using one drop in each eye twice/day. Because of the way Restasis works, it takes two months to "start working". I have found that many patients use it for a few weeks then conclude it won't help. The medication often stings when therapy is begun--it usually gets better by week three or your Ophthalmologist (EyeMD) can prescribe a mild steroid drop for a couple of weeks. If you did not take for 8 weeks you need to restart therapy. Improvement often continues for up to 6 months.
If you have tried tear duct plugs you should have had all for tear duct openings (puncta) plugged with a permanent plus (not a disolving one). Usually just the lower lids are done with mild dry eyes. If your problem is as bad as you say, you and your ophthalmologist should discuss permanent closure of some or all four of the tear duct openings with cautery.
Be sure to try Nature’s Tear’s Eyemist a spray for dry eyes that works for many people. It is available without a prescription. http://www.naturestears.com/
Additional things that can help include a diet rich in fatty fish (eg salmon, sardines, etc). Fish oil taken by mouth usually 2 to 4/day has been show to help some patients. In addition there are non-prescription pills for dry eyes available at most major drug stores or by direct order from the companies. Thera-tears formula for dry eyes is probably the most widely used. You can use any search engine to pull up the websites of the companies that see these.
Ask your ophthalmologist (Eye MD) about Lacriserts. These were unavailable for several years and are now on the market by Aton Pharma. They are very tiny pellets of hydroxypropyl cellulose that are placed between the eye lid and the eye and slowly dissolve over 24 hours coating the eye with a moisturizing coat. They are a prescription medication.
In dry eyes associated with corneal damage, moisture retaining goggles are used for sleeping. Be absolutely certain you do not sleep under a fan, heating outlet or situation where air moves over your face during sleep. Make certain you home is humidified in the winter, put a humidity gage in the bedroom. If you cannot maintain a 50-60% humidity put a room humidifier in the bedroom. Run the A/C or heater of your car through the vents on your feet not in your face. Long car or plane trips put your tears in every couple of hours.
If you are menopausal or post-menopausal be sure you and your gynecologist maintain optimal hormonal balance. (Many women with dry eyes have dry mouth and dry vaginal canal). If you have joint pain have that evaluated to be sure you don't have Sjorgren's syndrome. Many medications eg antihistamines can make dry eye worse. You might review your medications with your ophthalmologist.
If you reach a point of exhausting all the above see an ophthalmologist that specializes in "Cornea and External Disease". This is their special area of expertise. A final new treatment that they can often do is “Autologist Platelete-rich plasma” therapy. This uses eyedrops made out of your blood products. (reference Ocular Surgery News: November 1, 2007 page 46 lead author Jorge Alio MD.
Keep digging and moving forward. I suspect you have not exhausted all the ways you can be helped.