Last Updated : 19 Jun, 2023
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Human Eye and a camera have many similarities that allow both to capture daily life moments, though in different ways. While the human eye is a sensitive sense organ, a camera appears to be a robotic eye with a cornea-like lens and retina-like film. Both aim to focus on the image that is real and inverted.
Differences Between the Human Eye and Camera
Differences based on | Human eye | Camera |
| Type | Human eye is a visual organ that consists of living cells. | Camera is a optical equipment used to record the image. |
| Image capture | Human eye uses live cells to detect light and objects. | Camera uses a diaphragm to detect and capture the image. |
| Image visualization | Human eye sees the object in 3 dimensions. | Camera visualizes the object in 2 dimensions. |
| Control of focus | Pupil controls the focus in the human eye. | The lens controls the focus in the camera. |
| Blind spot | The blind spot is present in the human eye. | A blind spot is absent in the human eye. |
| Focusing of object | An object is focused by changing the focal length of the eye lens. | An object is focused by changing the distance between the lens and the film. |
| Recording of image | Image can not be recorded by human eye. | The image can be recorded by the camera. |
| Focal length | The focal length of the convex lens can be changed by the action of the ciliary muscle. | The focal length of the convex lens can be fixed |
Human Eye
The human eye is a spherical ball with a diameter of approximately 2.3 cm. The outer covering of the eye is called the sclera. Light enters the eye through the cornea, which forms a transparent bulge on the front surface of the eyeball. The function of the cornea is to refract the light rays entering the eye and to adjust the focal length. Behind the cornea, there is a muscular diaphragm that controls the size of the pupil, known as the iris. The amount of light entering the eye is regulated by the pupil. The retina consists of a large number of light-sensitive cells that get activated upon illumination and generate electric signals. The optic nerve sends these signals to the brain, which interprets and processes the information so that we perceive the objects the way they are. The eye lens forms the real and inverted image on the retina. Optic nerves are of two types:
- Cones: These cells are more sensitive to bright light. They help in central and color vision.
- Rods: These cells are more sensitive to dim light. They help in peripheral vision.
Camera
A camera is an optical device that is used to capture the image. It is a closed box with a small opening called an aperture through which the light passes. It captures an image on photographic film. The lens focuses the light, and the shutter adjusts the amount of light entering the camera.
FAQs on Human Eye and Camera
Q1: What is the accommodation?
Answer:
Accommodation is the process of changing the shape of the lens by the ciliary muscle to focus on near or distant objects.
Q2: What is a blind spot?
Answer:
It is a small area at the back of each eye, where the optic nerve leaves the eye. It lacks photoreceptor cells, so no image is formed on the retina in this area.
Q3: What are rod and cone cells?
Answer:
Optic nerves are of two types:
- Cones: These cells are more sensitive to bright light. They help in central and color vision.
- Rods: These cells are more sensitive to dim light. They help in peripheral vision.
Q4: What are the common eye defects?
Answer:
There are three common eye defects:
- Myopia or near-sightedness,
- Hypermetropia or far-sightedness,
- Presbyopia
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