These ferocious aerobatic hunters are renowned for their enormous compound eyes, which give them the optical acuity necessary to seize prey in mid-air over open water. Both dragons and damsels have short antennae, so vision is their primary means of navigating and capturing food.

Dragonflies, however, were found to possess no less than 11 types of opsins, allowing them to see even ultraviolet and polarized light. They also have three small eyes called ocelli that can detect movement faster than their compound eyes.

Their massive globular eyes should have been a clue. It turns out dragonflies have souped-up colour vision that’s better than anything ever seen in the animal world. A study of 12 dragonfly species has found that each one has no fewer than 11, and some a whopping 30, different visual opsins.

Dragonflies (and bees) have the largest compound eyes of any insect; each containing up to 30,000 facets, and the eyes cover most of the insect’s head, resembling a motorcycle helmet.

Monocular Vision Adjustment Takes Time Whitaker said. But studies have shown that adults who lose the sight in one eye have declines in their abilities to accurately track moving objects, to judge distances, and to perceive depth.

The human eye belongs to a general group of eyes found in nature called “camera-type eyes.” Just as a camera lens focuses light onto film, a structure in the eye called the cornea focuses light onto a light-sensitive membrane called the retina.

And around 10%, 5%, and 2% of people have blue, hazel, and green eyes, respectively. Seeing as gray eyes are the most attractive but happen to be one of the rarest eye colors in the world, it seems uniqueness and attractiveness are heavily linked.

Almond Eyes

We use our eyes to communicate our feelings and our interest. When people are aroused, their pupils, the black circle at the center of the eye, become larger. This signal of arousal is found attractive, particularly to men, but also to women, even when we don’t consciously notice it.