Eye color is one of the most prominent features that make us unique. The color of our eyes is determined by the amount and distribution of melanin in the iris. Melanin is a pigment that is responsible for the color of our skin, hair, and eyes. The more melanin you have in your iris, the darker your eye color will be. The less melanin you have, the lighter your eye color will be. Generally, there are only a few eye colors, including blue, green, hazel, and brown. But, sometimes, the eye color can change, which is not common, but it can happen.

It is important to note that changes in eye color can be a sign of an underlying medical condition. So, if you notice a change in your eye color, it is important to consult with an ophthalmologist or other medical professional to rule out any underlying medical condition.
With that said, let’s dive into the possible reasons why your brown eyes turned green.
The first possibility is that it is just an optical illusion. The color of our eyes can appear to change depending on the lighting and the colors around us. For example, if you are wearing a green shirt, it can reflect in your eyes and make them appear greener than they actually are. Similarly, if you are in a room with a lot of natural light, your eyes may appear lighter than they do in dimmer lighting.
Another possibility is that you are wearing colored contact lenses. Contact lenses are a popular way to change the color of your eyes temporarily. If you have brown eyes and want to change them to green, you can buy green-colored contact lenses. The contact lenses will cover your brown iris and give the appearance of green eyes. However, it is important to note that contact lenses can be harmful to your eyes if not used properly. So, if you are wearing contact lenses, make sure to follow the instructions carefully and consult with an eye doctor if you have any concerns.
The next possibility is that your eye color is changing naturally. As we age, our bodies go through many changes, and our eye color can be one of them. It is not uncommon for the color of our eyes to change slightly over time. For example, some people may notice that their blue eyes become more grey or green as they get older. However, a dramatic change from brown to green is not common and may be a sign of an underlying medical condition.
One medical condition that can cause a change in eye color is Horner’s syndrome. Horner’s syndrome is a rare condition that affects the nerves that control the pupil and the eyelid. The condition can cause one eye to become smaller than the other, the eyelid to droop, and a change in eye color. The affected eye may appear lighter or darker than the other eye, and the color may change from brown to blue or green. Horner’s syndrome can be caused by a variety of factors, including nerve damage, tumors, and certain medications. If you suspect that you may have Horner’s syndrome, it is important to consult with a medical professional as soon as possible.
Another medical condition that can cause a change in eye color is Fuchs’ heterochromic iridocyclitis. This is a rare condition that causes inflammation in the iris and can lead to a change in eye color. The affected eye may appear lighter or darker than the other eye, and the color may change from brown to blue or green.