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For visible-beam consumer lasers, there are four main classes. Each is described in more detail here: Class 2, Class 3R, Class 3B and Class 4. The first two Classes are relatively safe for eye exposure; the last two are hazardous. The chart below shows how the eye injury hazard increases as the laser’s power increases. Click chart for larger ...
- Class 3B
The Nominal Ocular Hazard Distance (NOHD) for a...
- Laser Safety Info
Class 2 or II (up to 1 milliwatt - typical laser pointer in...
- Laser Labels
Laser labels We have provided ready-to-print labels for...
- FAQ
If a Laser Safety Facts label cannot fit onto a laser,...
- QR and DM Codes
For example, “LSF.ME/2” goes to a page describing Class 2...
- Class 3R
A 4.99 mW Class 3R laser beam can temporarily flashblind a...
- About
Laser Safety Facts Helping the public safely use consumer...
- Class 2 Labels
Generic Class 2 Laser Safety Facts labels (diode laser only)...
- Class 3B
There are four main classes for visible-beam lasers: Class 2, Class 3R, Class 3B and Class 4. The first two are relatively safe for eye exposure; the last two are hazardous. The chart below shows that the eye injury hazard increases as the laser’s power increases. Click chart for larger view.
Class 2 laser relies on the blink or aversion response for laser safety. If struck in the eye by a Class 2 laser, one will normally blink or turn away. This response takes less than one quarter of a second, which is adequate time to protect the eye. Since the eye must SEE the light to cause the aversion response, there are no invisible Class 2 ...
• Max allowable level without eye protection • With Class 2 lasers eye blinking helps increase exposure • eg 1 mW HeNe laser, 3 mm beam: Power density =14 mW/cm2 • However in Eye is focused to 1.4 KW/cm2 • MPE levels for that are 0.25 sec at retina • About typical blink response time • Hence brightness causes eye to shut before damage
1 mar 2009 · For lasers emitting wavelengths in the “retinal hazard spectral region,” approximately 400 to 1,400 nm, damage is characteristically confined to the retina. In such cases, radiation is transmitted through the cornea, aqueous humor, lens and vitreous humor and is imaged or focused to a small area on the retina.
Identify a laser’s class by reading the FDA warning label. Most red laser pointers are Class 2 and radiate less than 1mW of power. Class 2 lasers are safe if the beam accidentally enters the eye for a short period. The aversion response (blinking or turning the head) is fast enough (0.25 seconds) to prevent injury from the laser exposure.
25 cze 2019 · Retinal injuries from laser pointers are up in recent years, and the damage is both severe and irreversible. 1 But at least now doctors are figuring out ways to understand and identify the damage this helpful classroom tool (and popular cat toy) can cause.
