Which laser spectrum is considered the "retinal hazard" region?

The correct range identified as the "retinal hazard" region is the portion of the electromagnetic spectrum that poses the highest risk of causing damage to the retina when exposed to laser radiation. This region extends from approximately 400 to 1400 nanometers. Within this spectrum, visible light (400 to about 700 nanometers) can be injurious due to the high sensitivity of photoreceptors in the retina. In addition, near-infrared light (700 to 1400 nanometers) can penetrate deeper, potentially causing thermal damage to the retinal tissues without an individual being aware of the exposure, as infrared light is not visible to the human eye.

Understanding this spectrum is vital for anyone working with lasers, as appropriate safety measures can be designed to protect individuals from potential ocular hazards associated with laser use. By focusing on this range, preventive measures such as protective eyewear, safety training, and controlled access to specific areas can be accurately applied. This helps ensure a safe work environment where the risk of retinal injury is properly managed. The other options do not accurately define the complete range of wavelengths where retinal hazards can occur based on laser exposure.