Which Purkinje image represents the posterior lens?

The Purkinje images are reflections of light that occur at different interfaces of the eye, and they are numbered based on the layers of the eye they represent. The first Purkinje image (PS1) is the reflection from the anterior surface of the cornea, while the second (PS2) comes from the posterior surface of the cornea. The third Purkinje image (PS3) reflects from the anterior surface of the lens.

The fourth Purkinje image (PS4) represents the reflection from the posterior surface of the lens. Therefore, identifying PS4 as the reflection from the posterior lens aligns with the hierarchy and naming of these images in relation to the various optical surfaces within the eye. Recognizing that the posterior lens has a distinct reflection helps in understanding the optical pathways and the properties of light as it traverses the eye, which is essential for visual perception assessments.