If it was a red one then probably not very effective, but if its a green one they can be dangerous, however some things to factor:
IR Filter - if the laser doesn't have an IR filter it can be dangerous.
Wavelength - whats the effective wavelength of the laser.
At the power a laser pen is capable of (I see the photo says 100mw - no chance) and the distance involved, it'd be no different than shining a torch at your eyes from a few feet.
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