Eye Tracking Basics: Anatomy of the Eye

Developing an eye tracking algorithm that can pinpoint the location of a person’s gaze is not a simple task. To begin to tackle this challenge, an in-depth understanding of the eye’s anatomy is essential. Eye-Com Corporation’s developers have become experts on the physiology of the eye and vision system. It is a complex system of tissues, muscles, and nerve sensors, which function collectively to create the phenomenon of sight. To better understand how eye tracking works, you should know a bit about the biology of this fascinating organ. Entire books are written about the eye and how vision is created, but here is just a brief description of the key parts of the anatomy of the eye:

Sclera: The white portion of the eye, which is a dense tissue containing blood vessels and providing a surface for attaching the external muscles of the eye.

Pupil: The round, black opening in the center of the iris that allows light to pass through the eye and onto the retina.

Iris: The colored part of the outer eye. This thin muscle constricts or dilates to adjust the diameter of the pupil, thus controlling the amount of light that enters the eye.

Cornea: The transparent tissue that covers the front of the eye including the pupil and iris. It refracts light as it enters the eye and is responsible for most of the eye’s focusing abilities.

Lens: After light enters through the pupil, it passes through the lens, which focuses the light and projects it onto the surface of the retina in the back of the eye.

Retina: A light sensitive tissue that lines the inner surface of the back of the eye. It transforms light that enters through the pupil and passes through the lens into nerve signals that are converted into an image by the visual cortex of the brain.

All of these components function simultaneously to allow us to see our surroundings. Being able to pinpoint the final result of this process is what makes eye tracking such a powerful tool with so many applications.

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