A study done by researchers at the University of Pittsburgh found that white women who have light-colored eyes, such as green or blue, can handle pain and distress better than brown- and hazel-eyed women.
One of the proteins the NCX-4 gene controls is related to pain. Additionally, genes related to melanin are also related to pain. Melanin is the pigment that makes eyes darker. This explains why people with darker eyes are more susceptible to pain.
Generally speaking, patients with lighter color irises, such as blue or gray, experience more light sensitivity than someone with brown eyes. The density of pigment in light eyes is less than that of a darker colored iris. When light hits a dark-colored iris, the higher density in pigment blocks the light rays.
This is because blue eyes, especially light blue eyes, have less pigment in the iris, making them more translucent. This can cause blue-eyed people to be more susceptible to glare and sunlight, leading to light sensitivity. Blue eyes may also water more in bright light as they are more sensitive.
Green has traditionally been called the rarest eye color. But new classifications say another color may be even less common—gray. Eye color is an inherited trait with multiple genes affecting the shade.
Brown eyes may have ranked as the least attractive, but they were 1.6 times more likely than blue eyes to be described as trustworthy.
The second-rarest eye color is hazel, a mixture of brown and green with golden flecks. About 18% of Americans have hazel eyes, compared with about 5% of the world's population.
There are plenty of blue-eyed Asians. This probably happens when the traditional blue-eyed allele comes into a family from a (possibly very distant) European ancestor. Blue eyes then resurface in a child generations later if they inherit the allele from both parents.
Lighter colored eyes like blue, hazel and green have less of a pigment called 'melanin' than brown eyes do. Melanin helps protect the retina from UV damage and blue light, putting those with blue eyes at a higher risk of developing UV-related eye damage.
"Many studies have been performed and they all concluded the same thing - a majority of all people consider those with blue eyes to be slightly more attractive on average than people with brown or hazel eyes."
We found that green is the most popular lens colour, with brown coming in a close second, despite it being one of the most common eye colours. Although blue and hazel are seen as the most attractive eye colours for men and women they are surprisingly the least popular.
More light is reflected by bright colors, resulting in excessive stimulation of the eyes. Therefore, yellow is an eye irritant. Some claim that babies cry more in yellow rooms, husbands and wives fight more in yellow kitchens, and opera singers throw more tantrums in yellow dressing rooms.
Unbelievable as it may seem, the answer is yes—natural purple eyes do exist. Purple eyes are also commonly referred to as “violet eyes,” as they are typically a light shade. For most people, this striking eye color can only be achieved with the help of colored contacts.
The piece goes on, Race-based physiological myths have long influenced medical practice, he said. Even today, some doctors believe that African-Americans are more tolerant of pain. One study found that relative to other racial groups, physicians are twice as likely to underestimate black patients' pain.
The pupil can change size with certain emotions, thus changing the iris color dispersion and the eye color. You've probably heard people say your eyes change color when you're angry, and that probably is true. Your eyes can also change color with age. They usually darken somewhat.
While blue eyes are more sensitive to light during the day, people with blue eyes tend to see better at night – unless there are bright lights. In that case, the lack of melanin makes them as sensitive to light at night as they are during the day.
Blue Eyes are More Sensitive to Light
Melanin in the iris of the eye appears to help protect the back of the eye from damage caused by UV radiation and high-energy visible “blue” light from sunlight and artificial sources of these rays.
Light-eyed people (with blue or green eyes) have slightly better night vision because they have less pigment in the iris, which which leaves the iris more translucent and lets more light into the eye.
Blue is the second most common eye color globally, with an estimated 8 to 10 % of people having blue eyes. A majority of these people are of European descent, however, Black people can be born with blue eyes even though it's pretty rare.
Scientists believe that it is possible to trace all blue-eyed people back to a common ancestor, who likely had a genetic mutation that reduced the amount of melanin in the iris. Most people with blue eyes are of European descent.
Iceland, the northernmost country of the bunch, has the greatest percentage of people with blue eyes.
Legendary actress Elizabeth Taylor's eyes were famous for being stunningly beautiful and distinct. Widely known for having the most striking eyes in Hollywood, Taylor had what appeared to be rare natural purple eyes.
Complete heterochromia is definitely rare — fewer than 200,000 Americans have the condition, according to the National Institutes of Health. That's only about six out of every 10,000 people. It's currently unknown how rare central heterochromia is, but we do know that it isn't quite as rare as complete heterochromia.
The rarest skin color in the world is believed to be the white from albinism, a genetic mutation that causes a lack of melanin production in the human body. Albinism affects 1 in every 3,000 to 20,000 people. What is this? People with albinism usually have very pale or colorless skin, hair, and eyes.