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.
According to some studies, there is a slight difference in vision capabilities based on eye color. 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.
Those with darker colored eyes experience less visual discomfort in bright, sunny conditions. Also, darker irises reflect less light within the eye, reducing susceptibility to glare and improving contrast discernment—so people with darker eyes may have better vision in high-glare situations, such as driving at night.
Of all eye colors, brown seems to be the only one that could be called “advantageous” from a survival perspective. While more research is needed, darker irises are linked to a number of health benefits, including these: Reduced risk of macular degeneration.
It is generally not harder for brown-eyed people to see in the dark compared to other eye colors. In fact, there is no scientific evidence to suggest that the color of one's eyes impacts their ability to see in the dark.
Brown eyes are more resistant to problems because they have more melanin. It also helps to repair DNA damage and to keep the eyes moist. People with brown eyes are also less likely to develop certain types of eye diseases, such as age-related macular degeneration.
Some wavelengths are easier for the human eye to recognize. And some others are not. In daylight, green is the most visible color from a distance for human eyes. In the darkness, however, yellow is the easiest color to recognize.
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.
Where in the world are the most green eyes? The highest concentration of people with green eyes is found in Ireland, Scotland, and northern Europe. In fact, in Ireland and Scotland, more than three-fourths of the population has blue or green eyes – 86 percent!
People who had deep brown eyes during their youth and adulthood may experience a lightening of their eye pigment as they enter middle age, giving them hazel eyes. Conversely, someone born with hazel eyes might see their irises get darker as they grow older.
People with brown eyes are said to be independent, determined and self-confident. Yet, you never fail to remain humble. When people look at you, they get a sense of security and stability – you are known to be trustworthy. While you may want to act tough, your brown eyes portray how kind and sensitive you truly are.
Blue Eyes Are More Sensitive to the Sun than Brown Eyes–But Everyone Should Wear Sunglasses. Even though light eyes are more sensitive to sunlight than dark eyes, everyone benefits from wearing high-quality sunglasses.
Exposure to white light during the day can have positive effects, including boosting alertness and mood. Red light has no effect on the circadian clock, so you can use a dim red light at night. Yellow and orange light have little effect on the clock so you can use a very dim yellow or orange light at night.
The cones are the colour receptors sensitive across the range of colours but need quite a bit of light to work, the rods are better at night - low light - but are less sensitive to the red end.
Possible Causes
Glaucoma medications that work by constricting the pupil. Cataracts. Retinitis pigmentosa. Vitamin A deficiency, especially in individuals who have undergone intestinal bypass surgery.
There's a little genetic tweak that makes the combination of red hair and blue eyes the rarest of them all. The same Nature study mentioned above found that another gene variant, HERC2, interacts with both the MC1R gene and the OCA2 gene—and it can shut off the redhead gene while expressing blue eyes and blonde hair.
Green is considered by some to be the actual rarest eye color in the world, though others would say it's been dethroned by red, violet, and grey eyes. Green eyes don't possess a lot of melanin, which creates a Rayleigh scattering effect: Light gets reflected and scattered by the eyes instead of absorbed by pigment.
Mantis shrimps probably have the most sophisticated vision in the animal kingdom. Their compound eyes move independently and they have 12 to 16 visual pigments compared to our three. They are the only animals known to be able to see circular polarised light.
Blue eyes also represent innocence and carefree. Brown eyes are a more mature eye color and represent stability, security and strength.
Which color is the worst offender? Some say yellow. Pure, bright lemon yellow generally is considered the most fatiguing color. The reason is that since more light is reflected by bright colors, the result is excessive stimulation of the eyes, hence, eye irritation.
Hazel is the most attractive eye colour in females
Blue and brown, the most popular for men, trended towards the bottom middle of the list, with brown eyes - the most common in the world - receiving only 13% of all matches.
Disadvantages of Brown Eyes
Brown eyes seem to put people at a higher risk for developing cataracts. According to the American Academy of Ophthalmology, one Australian study showed that the risk of cataracts may be twice as high for people with brown eyes compared to people with different eye colors.
Intelligence was the number one trait associated with brown, the most common eye color in the U.S., by 34 percent of respondents.
According to the AAO, melanin may also protect the eye from some health conditions- but not others. For example, individuals with brown eyes supposedly carry a lower risk of eye cancer, diabetic retinopathy and macular degeneration but a higher risk of cataracts, as opposed to people with lighter eyes.