No, the size of the human iris is not the same for everybody. The iris is the colored part of the eye that surrounds the pupil, and its size can vary among individuals.
The size of the iris is determined by genetics and can be influenced by factors like age and lighting conditions. In bright light, the iris constricts to reduce the amount of light entering the eye, while in dim light, it dilates to allow more light in.
People with lighter-colored eyes, such as blue or green, often have larger irises, which can make the pupils appear more dilated than in people with darker-colored eyes, such as brown. However, the range of iris sizes can still vary within each eye color group.
Additionally, certain medical conditions or medications may cause abnormal changes in the size of the iris or the pupils. If you notice any significant changes in your eye appearance or function, it's essential to consult with an eye care professional for a proper evaluation.