Laser Safety: Understanding the Risks to Your Eyes
Laser beams pose serious ocular hazards due to their coherence, collimation, and high energy density. Key injury mechanisms include:
- Retinal Burns: Focused laser energy causes thermal damage to the retina, leading to permanent blind spots or central vision loss.
- Corneal Damage: The corneal surface can be ablated or denatured, causing pain, inflammation, and blurred vision; severe injury may cause permanent opacity.
- Cataract Induction: Chronic exposure to certain wavelengths (especially near‑infrared) accelerates lens opacification.
- Glare and Flash Blindness: Intense visible light causes temporary vision impairment, hazardous during driving or machinery operation.
- Indirect Trauma: Periorbital skin burns can cause swelling that compromises vision.
Risk depends on laser power, wavelength, exposure duration, and distance. Lasers are classified (Class 1–4) by hazard potential; appropriate eyewear, engineering controls, and safety protocols are mandatory for Class 3B and 4 lasers.
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