"The diameter of the pupil in normal conditions varies within the limits of 2.7-4.8 mm in the dark (22.5-40% of iris diameter), an average of 3.5 mm (approximat

"The diameter of the pupil in normal conditions varies within the limits of 2.7-4.8 mm in the dark (22.5-40% of iris diameter), an average of 3.5 mm (approximately 29% of iris diameter). In newborns, pupils are physiologically narrowed (2.32±0.05 mm, that is 19-20% of iris diameter). From the second month, the pupils increase in size gradually an average of 64% up to the sixth month, and more by 8.6 % to the first year of age. This process takes place within the tenth to the eleventh years for a child. Between 10 to 14 years of age, the opposite dynamics are observed, which can be subdivided into three periods. During the first period (15 to 24 years), pupil dimensions are decreased considerably by 17-19%. In the course of the second period (25 to 50 years), narrowing is going less intensively (on average by 6-9% every five years). During the third period (50 to 80 years), the pupils are relatively narrow (2.63±0.06 mm – approximately 22 % of iris diameter) undergoing a smaller decrease in diameter, which is 3-4% every ten years.": Source: https://pupilanalysis.com/pupillary-dimensions/ https://pupilanalysis.com/pupillary-dimensions/