I must respectfully disagree. Although many laser pens are in the range of a few mW (milliwatts),many are available from 500mW (1/2 Watt) up to 5000 mW (5 Watts) and higher.
Devices rated higher than 500 mW are rated Class 4 devices and can cause serious injury with either direct or reflected exposure.I worked for laser companies for 15 years and laser eye safety is no laughing matter.