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I thought, and I may be wrong, that UV/IR wavelengths are at different focus point wrt visible light. If not filtered the sensor sees these wavelengths as energy (regardless of the energy being non-visible) thus your focus can be upset...trying to focus on the wrong wavelengths. However we are talking nano meters here.
UV is higher energy wrt visible and this can cause blooming of the sensor..If the sensor was designed for visible light. Though..that said..I don't know what the design parameters of the CCD were taken into account? ...aka was it designed to accommodate this type of wavelength?
I don't think there is any possibility of damage from UV to the sensor so I am probably talking about my semantics of this.
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