Now, more and more laser pointer and flashlights sold in the market are class IIIB with a power over 5mW. But when the light directly penetrates into the eyes, there may be some damage. Especially to some high power, diffuse light probably damage the eyes, the focus are more likely to ignite flammable materials. The eye is of prime interest for two reasons: Firstly, the eye is the only organ of the body that allows optical radiations, from 400 to 1400 nm, to penetrate deep within it. Secondly, the refractive properties of the cornea and lens result in an increase in irradiance (W/cm2). If sufficient energy falls upon the retina to produce irreversible damage then such damage may occur as a result of one of three primary damage mechanisms. Therefore laser pointers are not a toy, not suitable for kids. When operating powerful light pointer, wear special secure glasses would be safe, especially for the invisible lights.