Today, iris recognition plays a significant role in numerous applications, particularly in person detection. Iris recognition techniques utilize the physiological traits of a person's eye for identification. Most biometric iris detection systems capture the image of the eye and the region of interest, making the ocular image crucial for detection. The human iris is a data-rich biometric identifier that remains constant throughout a person's life and offers a high level of security [1]. These iris images are stored in databases, which are used to retrieve eye images taken under different circumstances. Various types of databases are available on the internet, allowing users to access them for free. This essay aims to examine the properties of the iris and compare multiple iris image databases.