![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Diagram_of_four_Purkinje_images.svg/640px-Diagram_of_four_Purkinje_images.svg.png&w=640&q=50)
Purkinje images
Reflections of objects from the structure of the eye / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Purkinje images?
Summarize this article for a 10 year old
Purkinje images are reflections of objects from the structure of the eye. They are also known as Purkinje reflexes and as Purkinje–Sanson images. At least four Purkinje images are usually visible in the normal eye. The first Purkinje image (P1) is the reflection from the outer surface of the cornea. The second Purkinje image (P2) is the reflection from the inner surface of the cornea. The third Purkinje image (P3) is the reflection from the outer (anterior) surface of the lens. The fourth Purkinje image (P4) is the reflection from the inner (posterior) surface of the lens. Unlike the others, P4 is an inverted image.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Diagram_of_four_Purkinje_images.svg/320px-Diagram_of_four_Purkinje_images.svg.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/030608_Pupil.jpg/640px-030608_Pupil.jpg)
Purkinje–Sanson images are named after Czech anatomist Jan Evangelista Purkyně (1787–1869) and after French physician Louis Joseph Sanson (1790–1841).
The third and fourth Purkinje images can be visible from within the eye itself. Light reflected away from the surfaces of the lens can in turn reflect back into the eye from the rear surface of the cornea.
The first and fourth Purkinje images are used by some eye trackers, devices to measure the position of an eye. The cornea reflection (P1 image) used in this measurement is generally known as glint.[2]