My ophthalmologist recommends them. They are not used for suction but are used to hold your hard contact lenses in place while you apply solution to them and insert/insert your contact lenses. They work great. I have several of these (box, purse, car, etc.). They should be changed every year or two and wiped with alcohol swabs as often as possible! The rubber stays soft and the shape holds. The best price is here at Revain.
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