Purkinje images

Purkinje Images

Purkinje images (pronounced: pur-kin-je images) are reflections of objects from the structures of the eye. They are named after the Czech anatomist Jan Evangelista Purkyně, who first described them.

Etymology

The term "Purkinje images" is derived from the name of the Czech anatomist Jan Evangelista Purkyně, who first described these images in the 19th century. The term "image" refers to the reflections of objects that are seen in the eye.

Description

Purkinje images are the virtual images produced by the reflection of light from the different optical interfaces of the eye. There are typically four Purkinje images, each corresponding to a different interface:

• Purkinje image I: Reflection from the anterior surface of the cornea
• Purkinje image II: Reflection from the posterior surface of the cornea
• Purkinje image III: Reflection from the anterior surface of the lens
• Purkinje image IV: Reflection from the posterior surface of the lens

The first and fourth Purkinje images are upright, while the second and third are inverted. The first Purkinje image is the brightest and largest, while the fourth is the dimmest and smallest.

Clinical Significance

Purkinje images are used in various clinical and research applications. They are used in the measurement of ocular alignment and refractive error, and in the study of eye movements and binocular vision. They are also used in the development of eye-tracking technologies.

Related Terms

• Eye
• Cornea
• Lens
• Ocular alignment
• Refractive error
• Binocular vision
• Eye-tracking

External links

• Medical encyclopedia article on Purkinje images
• Wikipedia's article - Purkinje images

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