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Most eye drop solutions are nothing more than saline solution. Buy an eye dropper and fill it with saline solution (that costs 99 cents a pint on sale) and use that when your eyes are dry. Much better than paying $3-$5 for 1 ounce of eye drops!
That same saline solution can also be used for nose drops to clear a stuffy nose. It's even safe to use on newborns, an age you wouldn't be able to use most over-the-counter decongestants.
You need to be extremely careful with putting anything in your eyes that is not sterile. An eye infection is not worth it.
Putting anything homemade in your eyes can be dangerous. If it isn't absolutely sterile you could get an infection.
Visine has a powerful astringent called 'tetrahydrozoline' which is why it is so effective. It also contains anti-microbial agents to maintain sterility. Saline solution is just a wash and has no medicinal effect and can easily become contaminated. It may flush out pollen and other irritants but it won't provide any other effect.
John and Sharon must be insiders to the eyecare industry. Indoctrinated! "Gotta buy our industry's drops and solutions--it's the ONLY way!"