Pupil vision refers to the crucial role the pupil plays in the process of sight, specifically how it allows light to enter the eye and reach the retina.
The pupil isn't a lens itself; rather, it's an opening in the iris (the colored part of your eye). Its primary function is to control the amount of light that enters the eye. Think of it like the aperture of a camera.
How Pupil Vision Works
| Step | Description |
|---|---|
| 1. Light Enters | Light from the environment enters the eye. |
| 2. Pupil Adjusts | The pupil dilates (widens) in dim light to allow more light in, and constricts (narrows) in bright light to limit the amount of light entering. |
| 3. Light Passes Through Lens | The light then passes through the lens, which focuses the light. |
| 4. Light Reaches Retina | The lens directs the focused light onto the retina, a light-sensitive layer at the back of the eye. According to the reference, the retina is where the light-sensing cells are located. |
| 5. Image Formation | The retina converts the light into electrical signals that are sent to the brain, where they are interpreted as images. |
Although the pupil is simply an opening, it appears black because any light entering the pupil is absorbed by the retina; therefore, no light is reflected back out. This light absorption is essential for proper vision.
