Which Purkinje image is formed by the anterior lens?

The correct choice for which Purkinje image is formed by the anterior lens is PS 1.

To understand this, it's essential to recognize that Purkinje images are the images of a point light source reflected from the various surfaces of the eye. There are four Purkinje images in total, designated as PS 1 through PS 4.

PS 1 specifically corresponds to the reflection from the anterior surface of the cornea, while PS 2 is the reflection from the posterior surface of the cornea. PS 3 is linked to the anterior surface of the lens, and PS 4 reflects light from the posterior surface of the lens.

The anterior lens forms the Purkinje image PS 3. Hence, identifying which Purkinje image is associated with a particular surface is crucial for understanding the optical properties of the eye and how light is reflected off these surfaces. This knowledge is particularly important for visual perception and understanding the complexities of ocular optics.