What characterizes wavelengths that do not cause retinal harm?

Wavelengths that do not cause retinal harm are characterized by being outside of specific hazardous wavelengths. The human eye is sensitive to certain wavelengths, particularly those in the ultraviolet and blue light spectrum, which can be harmful to retinal cells. By identifying wavelengths that fall outside of these hazardous ranges, we can ensure they are safe for exposure. This means that wavelengths in the infrared range and those in the visible spectrum, as long as they are not overly intense or within harmful bands, would be included in this category of non-harmful wavelengths. The focus is on understanding that specific wavelengths are designated as hazardous based on their potential to cause damage, allowing for a clear distinction between safe and unsafe exposure levels.