Heterochromia iridium refers to a pair of eyes having different colors. For instance, brown and blue, or blue and gray. Heterochromia iridis means that one pupil of an individual’s eye is multi-colored. For example, the same pupil may be brown and blue, or blue and gray. This is a very rare condition. It usually occurs due to an increase or decrease of pigmentation in the iris.
Types of heterochromia
Heterochromia can be broadly categorized into three classifications, depending on the area where the colors are located in the pupil:
Complete heterochromia: This is caused when the color in the iris of one of the eyes varies completely from the color of the iris of the other eye. For instance, one eye may be green, while the other is brown.
Partial or sectoral heterochromia: As suggested by the name, only a part or sector of an iris is differently colored from the rest of it. This can occur to either or both irises. For example, a certain part of the iris may be blue, while the rest is dark brown.
Central heterochromia: Here, the border around the pupil is a different color than the rest of the iris. Spikes of the central color emanate from the pupil towards the middle of the iris. This results in multiple colors in the same eye. For example, a green ring around the pupil and blue in the iris.
Acquired heterochromia: This usually develops in later years of life due to an injury, certain diseases, and medication.