What type of hazards are posed by wavelengths that do not pass through fluid or glass?

The types of hazards posed by wavelengths that do not pass through fluid or glass are characterized as corneal hazards. This is due to the fact that specific wavelengths, particularly those in the UV range, are absorbed by the cornea and do not penetrate further into the eye. As a result, these wavelengths can cause damage to the outer structures of the eye, such as the cornea itself, leading to conditions like photokeratitis or more serious injuries.

Understanding the nature of different wavelengths is crucial in the context of laser safety. Certain wavelengths can be harmful depending on their ability to penetrate tissues. Wavelengths that are effectively absorbed by the cornea can result in injury specifically to this part of the eye without reaching the retina or deeper structures.

In contrast, retinal hazards arise from wavelengths that can pass through not only the cornea but also the lens and reach the retina itself, leading to potential damage there. Infrared hazards can also affect deeper tissues but are more related to thermal effects than to the corneal damage concern. UV hazards, while related in some way, typically refer more broadly to the types of radiation but focus on effects from sunlight or artificial sources that can cause skin damage as well. Therefore, the most accurate identification of hazards from wavelengths that