First and foremost – an owl can actually see in daylight. Yes, this is one of the interesting facts There is a common misconception that owls are blind during the day. Owls have a sharp vision during both day and night time. But the vision is extremely efficient during the night, spotting their prey even in the pitch of darkness.
Owls have large tubular shaped eyes which prohibits them from rotating the eyes.
The physical characteristics of their eyes influence their vision greatly. The large area of the eyes allows more light to get into eyes.
Consequently, their pupil expands greatly at night contributing to their excellent ability to see at night.
Large eyes let in more light than small eyes. In addition, their pupils can expand greatlyt night, enhancing their ability to see in the dark. Inside of an owl’s eyes, there are a large number of structures called rods. Rods are sensitive to light, so a large number of rods help owls see at night. Humans also have rods, but we have a much smaller number than owls have. As a result, owls see 35 to 100 times better than humans can in dim light.
In fact, they have a greater number of photoreceptor (light-sensitive) cells or rod cells compared to human eyes.
As a result, they have better night vision than us.
Contrastingly during the day, their quality of vision is affected badly due to too much of light that is required for them to see. Another one of the interesting facts is that their pupils do not shrink as ours in broad daylight so they close their eyes halfway to block some sunlight.
When owls close their eyes halfway, they block out the sky and some of the sunlight, but can still see the ground perfectly. They may look sleepy or even half asleep when really they are wide awake and alert.