At what classification level do lasers present a risk of eye injury from a reflected beam?

Lasers classified as IIIB present a risk of eye injury from a reflected beam due to their higher power output and potential for causing damage. Class IIIB lasers emit wavelengths that can produce harmful effects if the eye is exposed directly or indirectly to a reflected beam. This category includes lasers that are more powerful than Class II or IIa but do not exceed the limitations set for Class IV lasers, which can cause severe eye or skin damage.

Understanding the classification system helps in identifying the safety precautions necessary when working with different types of lasers. For instance, the lower classification levels, such as I and II, typically pose minimal risks to the eyes under normal use, while Class IIIA may have certain restrictions but still poses a lesser risk compared to Class IIIB lasers. Therefore, specific training and protective measures are vital when dealing with Class IIIB lasers to prevent potential eye injuries.