Structure and Function:
* Pupil Shape: Human pupils are typically round, while pig pupils are elongated vertically, resembling slits. This adaptation helps pigs see better in low-light conditions.
* Color Vision: Both humans and pigs have trichromatic color vision, meaning they can see red, green, and blue. However, pigs are less sensitive to reds and greens compared to humans.
* Field of View: Pigs have a wider field of vision than humans, encompassing roughly 310 degrees. Humans have a narrower field of view, around 180 degrees. This allows pigs to detect predators more readily.
* Sclera: The white part of the eye (sclera) is more prominent in humans than in pigs. Pig scleras are usually a grayish-pink color.
* Tapetum Lucidum: Pigs have a reflective layer called the tapetum lucidum behind the retina. This layer reflects light back through the retina, enhancing night vision. Humans lack this reflective layer.
* Eyelid Structure: Both have eyelids, but pigs have a third eyelid, known as the nictitating membrane, that can cover the eye for protection. Humans have a reduced nictitating membrane, only visible as a small fold in the corner of the eye.
Other Considerations:
* Size and Shape: Pig eyes are generally larger and more oval-shaped than human eyes.
* Evolutionary Adaptations: The differences in eye structure reflect the distinct environments and lifestyles of humans and pigs. Pigs have evolved for foraging in low-light conditions and detecting predators, while humans have evolved for more detailed vision in diverse lighting conditions.
Ethical Considerations:
It's important to note that animal eyes, including pig eyes, are complex and sensitive organs. Any research or handling involving animal eyes should be conducted ethically and with appropriate care.