The pupils react to light. Pupils are what allows light into the eye. When it is very bright out, pupils will be smaller because there is no need to work harder to let light in. In contrast, when it is darker, your pupils will grow in order to let as much light into your vision as possible. There could be different reasons why your pupils are always dilated larger than other people’s.
- Worse-case scenario….poisoning. Poisoning of chemical or biological substances can cause the pupil to dilate. As you have had larger pupils for as long as you can remember, I doubt this is the cause of your larger pupil dilation.
- Are you on prescription medications? Any kind of drug (prescription, over-the-counter, street) can cause pupil dilation. Some children on ADHD medications have enlarged pupils. It is a potential side-effect.
Regardless what the reason, you may want to ask your doctor. Sometimes abnormal pupil dilation can happen because of an underlying ailment. Strokes, brain tumors, or other issues that affect the brain can cause the pupils to dilate in an abnormal way (or even not dilate at all).
You may just be blessed with large pupils :)