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Understanding Eye Color

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Eye color is a hereditary trait that depends on the genes of both parents, as well as a little bit of mystery. The color of the eye is based on the pigments in the iris, which is a colored ring of muscle located at the center of the eye (around the pupil) that helps to control the amount of light that comes into your eye. Eye color falls on a spectrum of color that can range from dark brown, to gray, to green, to blue, with a whole lot of variation in between. 

Genetics

The genetics of eye color are anything but straightforward. In fact children are often born with a different eye color than either of their parents. For some time the belief was that two blue-eyed parents could not have a brown-eyed child, however, while it’s not common, this combination can and does occur. Genetic research in regards to eye color is an ongoing pursuit and while they have identified certain genes that play a role, researchers still do not know exactly how many genes are involved and to what extent each gene affects the final eye color.

The Iris

Looking at it simply, the color of the eye is based on the amount of the pigment melanin located in the iris. Large amounts of melanin result in brown eyes, while blue eyes result from smaller amounts of the pigment. This is why babies that are born with blue eyes (who often have smaller amounts of melanin until they are about a year old) often experience a darkening of their eye color as they grow and develop more melanin in the iris. In adults across the globe, the most common eye color worldwide is brown, while lighter colors such as blue, green and hazel are found predominantly in the Caucasian population. 

Abnormal Eye Color

Sometimes the color of a person’s eyes are not normal. Here are some interesting causes of this phenomenon.

Heterochromia, for example, is a condition in which the two eyes are different colors, or part of one eye is a different color. This can be caused by genetic inconsistencies, issues that occur during the development of the eye, or acquired later in life due to an injury or disease. 

Ocular albinism is a condition in which the eye is a very light color due to low levels of pigmentation in the iris, which is the result of a genetic mutation. It is usually accompanied by serious vision problems. Oculocutaneous albinism is a similar mutation in the body’s ability to produce and store melanin that affects skin and hair color in addition to the eyes.

Eye color can also be affected by certain medications. For example, a certain glaucoma eye drop is known to darken light irises to brown, as well as lengthen and darken eyelashes.

Eye Color - It's More Than Meets the Eye

It is known that light eyes are more sensitive to light, which is why it might be hard for someone with blue or green eyes to go out into the sun without sunglasses. Light eyes have also shown to be a risk factor for certain conditions including age-related macular degeneration (AMD).  

Color Contact Lenses

While we can’t pick our eye color, we can always play around with different looks using colored contact lenses. Just be sure that you get a proper prescription for any contact lenses, including cosmetic colored lenses, from an eye doctor! Wearing contact lenses that were obtained without a prescription could be dangerous to your eyes and your vision.  

 

 

 

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Dear Northwood Vision patient,

Here is what we are asking you to do to make a smaller exposure footprint:

  1. If you have any symptoms of loss of taste or smell, upset stomach/diarrhea coughing, fever, difficulty breathing, running nose please reschedule your appointment in 30 days or more.
  2. Wash your hands or use sanitizer immediately upon entering.
  3. Try not to touch any surfaces in the office you do not have to touch (you can push our door open with your foot! Try not to touch your face!)
  4. If you are trying on glasses, we will collect them from you for proper cleaning.
  5. Contact lenses can be shipped to you at no cost with an active rx (minimum 2 boxes)
  6. We will ask that if possible you come alone to the appointment. Guests can wait outside or in the car unless they need to be with you..
  7. If you have been exposed please wear a mask or reschedule in case you are an asymptomatic carrier, masks are encouraged to be worn by each patient if you have one.
  8. We will extend Contact lens prescriptions up to 6 months if recently expired and can direct ship an order to you if you see clearly and your eyes are feeling healthy.
  9. For a fee, we can ship your glasses to you if desired and you can have them adjusted after the shelter in place order is lifted.

Thank you for your patience and understanding during this stressful and trying time. May God bless each of you and keep you well.

Dr. Christopher K. Keats, OD

What is an Eye Emergency? Read more

Routine Care: “I see pretty well in my glasses or contact lenses. I just want to update my frame and / or get some new lenses to optimize my vision. I don’t have any pain or headaches and my eyes feel good and look normal in the mirror to me. I have never been told I have a disease in my eye that needs to be managed. I should definitely wait to come in until the “Shelter at Home” mandate is over. If I am a contact lens wearer, I understand Dr. Keats will allow me to get 3-6 months of contact lenses mailed to me even if my contact lenses are recently expired or close to expiring.”

Emergent Care: “I see poorly and am having difficulty functioning to drive, read, or see my computer. It is affecting my work. Waiting to be seen in 2 months would be very difficult for me to conduct my life.” Another form of emergent care… “I have other symptoms like headaches, red eyes, discharge, or I might have a disease that threatens my sight like diabetes, macular degeneration, glaucoma, a recent onset of flashes and floaters in my vision and so on.” A final type of emergent care would be a patient who realizes, “I am a patient who has a previously scheduled appointment for a medical condition Dr. Keats is managing to protect my sight, so I should plan on coming in for my visit. However, if my overall health is poor and the benefit to risk ratio says I should push this appointment off until the “Shelter at Home” mandate is lifted, it may be wise for me to reschedule for a later date.” In summary, emergent care means it is important that you be seen quickly for the protection of your visual health and current discomfort, or medical health, so you can function to do your work efficiently now and in the future.