Finally, we have the question of wavelength. The eye cannot see many of the wavelengths used in the optical fiber since the eye is sensitive to light in the visible regions of blue to red of the spectrum, while the optical fiber system works in the infrared. The liquid in the eye, which is mostly water, absorbs the infrared light in large quantities. The light from most fiber optic sources will be absorbed by this liquid, so any potential damage will likely remain in the lens or cornea, not in the retina.
While the light beam of the fiber optic that propagates makes it less dangerous to see it directly, using a microscope for fiber optic inspection can be a problem. The microscope will focus virtually all of the light inside the eye. That is why many microscopes used in fiber optics have filters to absorb any infrared light that could be harmful. Be careful with cheap microscopes, as they may not have infrared light blocking filters.
To be sure that the fibers are safe to be inspected or to work with, always check the fibers of a functioning network with a fiber optic power meter to make sure there is no light before inspecting a connector with a microscope.
While the light beam of the fiber optic that propagates makes it less dangerous to see it directly, using a microscope for fiber optic inspection can be a problem. The microscope will focus virtually all of the light inside the eye. That is why many microscopes used in fiber optics have filters to absorb any infrared light that could be harmful. Be careful with cheap microscopes, as they may not have infrared light blocking filters.
To be sure that the fibers are safe to be inspected or to work with, always check the fibers of a functioning network with a fiber optic power meter to make sure there is no light before inspecting a connector with a microscope.
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