Purkinje images

Purkinje images are reflections of objects from the structure of the eye.

The first Purkinje image (P1) is the reflection from the outer 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.

Purkinje–Sanson images are named after Czech anatomist Jan Evangelista Purkyně (1787–1869) and after French physician Louis Joseph Sanson (1790–1841).

[2] The brightness of the Purkinje images can be determined using Fresnel's equation:

The Purkinje images can be used to assess the curvatures and separations of the surfaces in the eye.