The retina contains a high density of rod cells, which are exceptionally sensitive to low light levels but do not detect color. It enhances the sensitivity of the retina, allowing the eel to perceive contrasts and movements that would be invisible to other creatures.
Underwater Eyes: How Eel Oil Inspires Skincare Innovation
Its primary function is to refract, or bend, light rays that pass through the vitreous humor and onto the retina. However, the true magic lies not in the lens itself, but in the environment surrounding it and the retina at the back of the eye.
The eye is spherical, covered by a tough, transparent cornea, and possesses a single, rounded lens. The oil compensates for this, effectively acting as an internal lens to focus light more efficiently onto the photoreceptor cells, thereby sharpening the image in low-light conditions.
Underwater Eyes: Eel Oil's Role in Sharpening Underwater Vision
Because water and the cornea have similar refractive indices, light bends less dramatically when entering an eel's eye compared to a land animal's eye. An eel can detect the shadow of a potential swimming prey item or the disturbance in the water column long before the prey becomes aware of the threat.
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