Typical Hoya Filter
Impossible to think filters without the name Hoya coming up. With digital camera sensors not being troubled in the least by ultraviolet wavelengths the Lens Protect filter has become an alternative to UV(0) filters being used for protective purposes. Coated with whatever wonder-stuff is used to kill reflections without impeding visible light (or at least only impeding it by minute values only detectable by spectro-photometry!), they make sense to protect vulnerable front elements. I would guess old-boys Hoya know a thing or two about optical coatings. Not guaranteed to help if you drop the lens of course, it's sheer luck if they survive that. Definitely will protect against dirt and dust, and small marks and scratches, which although they will not harm the performance of a lens in any meaningful sense, will decimate it's resale value if or when you want to trade it in for a new one.
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