Meadville Tribune

Community News Network

March 26, 2013

Slate: Your laser pointer is probably illegal

For all the whining everyone's always doing about jetpacks and other tech of the future, you'd think we'd be more impressed with the teeming abundance and affordability of lasers. In fact, we're so over Light Amplification by Stimulated Emission of Radiation, we've relegated the technology to kitschy beach-shop key chains and board games for nerds.

And yet a new study shows a majority of the dinky laser pointers on the market exceed the power level limits set by the Code of Federal Regulations, which means a whole lot of twerps out there wield far more retina-burning power than they should.

That laser pointers are potentially dangerous shouldn't come as any big surprise. However, ubiquity has a way of breeding a lack of respect. And lack of respect leads people to point electromagnetic radiation at the eye holes of rival soccer clubs or helicopter and airplane pilots.

"The human eye is a fantastic optical instrument capable of concentrating light a 100,000 times onto the retina," explains Joshua Hadler, physicist and laser safety officer for the National Institute of Standards and Technology Laser Radiometry Project. "More than a few milliwatts at the cornea can be focused to a spot so small that the power density on the retina can become greater than that generated when staring into the sun."

Power limits put in place by the CFR cap laser pointers at 5 milliwatts. Anything more powerful than that is technically not a "laser pointer" — that is, a handheld laser intended to trick an audience into thinking your PowerPoint slides are even vaguely interesting. Which is why it's concerning that Hadler and his co-authors Marla Dowell and Edna Tobares found some of the laser pointers they tested to be well above the 5 milliwatt output advertised on the labels. One showoff laser pointer clocked in at an absurd 66.5 milliwatts.

Text Only
Community News Network
  • Affirmative action ruling challenges colleges seeking diversity

    The U.S. Supreme Court's support of Michigan's ban on race-based affirmative action in university admissions may spur colleges to find new ways to achieve diversity without using racial preferences.

    April 23, 2014

  • A 'wearable robot' helps her walk again

    Science is about facts, numbers, laws and formulas. To be really good at it, you need to spend a lot of time in school. But science is also about something more: dreaming big and helping people.

    April 23, 2014

  • Cuba is running out of condoms

    The newest item on Cuba's list of dwindling commodities is condoms, which are now reportedly in short supply. In response, the Cuban government has approved the sale of expired condoms.

    April 23, 2014

  • The waffle taco's biggest enemy isn't McDonald's. It's consumer habits.

    Gesturing to Taco Bell, Thompson said McDonald's had "not seen an impact relative to the most recent competitor that entered the [breakfast] space," and that new competition would only make McDonald's pursue breakfast more aggressively.

    April 23, 2014

  • Screen Shot 2014-04-22 at 4.42.47 PM.png VIDEO: Leopard attacks crowd in India

    A leopard caused panic in the city of Chandrapur when it sprung from the roof of a house and charged at rescue workers.

    April 22, 2014 1 Photo

  • The top 12 government programs ever

    Which federal programs and policies succeed in being cost-effective and targeting those who need them most? These two tests are obvious: After all, why would we spend taxpayers' money on a program that isn't worth what it costs or helps those who do not need help?

    April 22, 2014

  • In cuffs... 'Warlock' in West Virginia accused of sexual assault

    Police in West Virginia say a man claiming to be a “warlock” used promises of magical spells to lure children into committing sexual acts with him.

    April 22, 2014 1 Photo

  • Cats outsmart the researchers

    I knew a lot had been written about dogs, and I assumed there must be at least a handful of studies on cats. But after weeks of scouring the scientific world for someone - anyone - who studied how cats think, all I was left with was this statement, laughed over the phone to me by one of the world's top animal cognition experts, a Hungarian scientist named Ádám Miklósi.

    April 22, 2014

  • McCain 1 House Republicans are more active on Twitter than Democrats

    Your representative in the House is almost certainly on Twitter. Your senator definitely is. But how are they using the social network? Are Democrats more active than Republicans, or vice versa? Who has the most followers on the Hill?

    April 22, 2014 1 Photo

  • Do your genes make you procrastinate?

    Procrastinators, in my experience, like nothing better than explaining away their procrastination: General busyness, fear of failure, and simple laziness are just a handful of the excuses and theories often tossed around. Now researchers from the University of Colorado Boulder have added another option to the list: genetics.

    April 21, 2014

Business Marquee
AP Video
SKorea Ferry Toll Hits 156, Search Gets Tougher Video Shows Possible Syrian Gas Attack Cubs Superfans Celebrate Wrigley's 100th Raw: Cattle Truck Overturns in Texas Admirers Flock to Dole During Kansas Homecoming Raw: Erupting Volcanoes in Guatemala and Peru Alibaba IPO Could Be Largest Ever for Tech Firm FBI Joining Probe of Suburban NY 'Swatting' Call U.S. Paratroopers in Poland, Amid Ukraine Crisis US Reviews Clemency for Certain Inmates Raw: Violence Erupts in Rio Near Olympic Venue Raw: Deadly Bombing in Egypt Raw: What's Inside a Commercial Jet Wheel Well Raw: Obama Arrives in Japan for State Visit Raw: Anti-Obama Activists Fight Manila Police Motels Near Disney Fighting Homeless Problem Michigan Man Sees Thanks to 'bionic Eye' S.C. Man Apologizes for Naked Walk in Wal-Mart Chief Mate: Crew Told to Escape After Passengers
Hyperlocal Search
Premier Guide
Find a business

Walking Fingers
Maps, Menus, Store hours, Coupons, and more...
Premier Guide
Stocks