Can Guinea Pigs See Infrared Light?

Infrared light is useful for seeing in the dark with special cameras, but human eyes can’t see it. It is electromagnetic radiation with wavelengths longer than visible red light. However, what about guinea pigs? Can guinea pigs see infrared light? Let’s find out!

Can guinea pigs see infrared light? No. Guinea pig eyes are most sensitive to blue and green light, and research shows their cones peak at about 429 and 529 nanometers. That is well short of infrared, so like us, they can't see it. They can feel the warmth from a strong infrared heat source, though.

Researchers have exposed guinea pigs to infrared light in lab studies. Even though guinea pigs can't see it, intense infrared exposure for long periods can damage the eye.

That is why you shouldn't point a strong infrared heater or lamp at your guinea pig's cage. Low-power infrared LEDs on security cameras and baby monitors are a different matter, but keep any heat source a safe distance from the cage.

Guinea pigs are prey animals. Their eyes sit on the sides of the head, giving them a wide field of view for spotting predators, but the Merck Veterinary Manual notes they may have trouble seeing directly in front of them.

Today, we will talk about guinea pigs and infrared light. I will answer various questions related to our topic. So, if you are ready to learn more about guinea pigs, let us move on!

Why Do Guinea Pigs Can’t See Infrared Light?

Whether an animal can see a type of light depends on the light-sensitive pigments in its eyes. Guinea pigs have rods plus two types of cones, so they have two-color (dichromatic) vision, much like many other mammals.

A 1994 study found guinea pig cones peak at about 429 nm (blue-violet) and 529 nm (green). Infrared starts at around 700 nm, far beyond what those pigments respond to.

Being warm-blooded has nothing to do with it. Mammals, including guinea pigs and humans, simply lack pigments sensitive to infrared.

Some animals can detect infrared in other ways. Pit vipers, pythons and boas sense heat with special pit organs, and mosquitoes home in on body heat. That is heat sensing, not vision.

Do Infrared Light Hurt Guinea Pigs’ Eyes?

Researchers have studied how different types of light, including infrared, affect guinea pig eyes. The effect of infrared depends on its intensity and how long the eye is exposed.

The two examples are experiment 1 and experiment 2. These were controlled lab studies, not everyday home exposure. Still, it is sensible to avoid shining strong infrared lamps or heaters at your guinea pig for long periods.

What Kind Of Light Can Guinea Pigs See?

Guinea pigs see visible light, with the best sensitivity in the blue and green range. They can tell some colors apart, but not the full range that people see.

Guinea pigs are active on and off throughout the day and night. A normal day-night light cycle suits them, with a quiet, dimmer area at night where they can rest.

Avoid leaving bright lights shining on the cage all night. You can give them a hide or partly cover one side of the cage so they have a darker place to rest.

Some guinea pigs prefer to sleep in a hide. Others sleep in the open once they feel safe in their surroundings.

Final Verdict

Guinea pigs make good pets because of their size and gentle nature, though they need daily care. They are delicate animals, so think about their surroundings.

Guinea pigs can't see infrared light, and low-power infrared from cameras and monitors is not a known concern. Just keep heaters and heat lamps well away from the cage, and talk to a vet who treats guinea pigs if you notice any eye problems, such as discharge or cloudiness.

Sources

• Spectral sensitivity, photopigments, and color vision in the guinea pig, Behavioral Neuroscience (via PubMed)
• Description and Physical Characteristics of Guinea Pigs, Merck Veterinary Manual