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The output of laser pointers available to the general public varies by country in order to prevent accidental damage to the retina of human eyes. The US FDA determined that Class IIIa lasers could cause injury to the eye if viewed directly for approximately 0.25 seconds, although it has cited evidence that exposure to visible lasers is "usually" limited by the blink reflex of the eye, which they have timed at just under 0.25 seconds. More recent studies show that the risk to the human eye from accidental exposure to light from commercially available class IIIa laser pointers having powers up to 5 mW seems rather small, typically involving deliberate staring into the beam for 10 or more seconds. Viewing of a laser pointer beam for more than 10 seconds can be harmful, however.

The UK Health Protection Agency warns against the high-power (over 5 milliwatt) typically-green laser pointers available over the Internet, with laser beam powers up to a few hundred milliwatts, since they are "extremely dangerous and not suitable for sale to the public

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