@ Fazor : basically, any laser over 5 mW, is dangerous enough for retina, mainly cause the reaction time of your eye (the time that it need for "blink" when hit from a high light for reflex) is long enough for let pass enough energy for damage the retina, with these powers (careful, this don't mean that 5 mW pointers are not dangerous, but with 5 or less mW, usually the quantity of light that pass before the "blink", is enough for "flash" temporarily your sight, but not for burn the retina ...... if you intentionally look directly a beam without close the eye, also just a milliwatt, you get some damage also from this)
The question is how you use the laser, and this only you can answer ..... if you use it with care, trying to never point at mirrors or shining objects, and never look into it, you can also not use goggles (anyway, consider that accidents always can happens
) ..... if instead you plan to use it in places where there are reflecting surfaces, at eyes highness, or where there is always a good probability of undesired reflections, and don't have the time for take care about all this, then yes, the goggles are highly recommended.