Difference Between Human Eye And Camera Pdf

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The human eye is a paired sense organ that reacts to light and allows vision. Rod and cone cells in the retina are photoreceptive cells which are able to detect visible light and convey this information to the brain. Eyes signal information which is used by the brain to elicit the perception of color, shape, depth, movement, and other features. The eye is part of the sensory nervous system. Similar to the eyes of other mammals , the human eye's non-image-forming photosensitive ganglion cells in the retina receive light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin , and entrainment of the circadian rhythm.

Comparison of the Human Eye to a Camera

The structure and operation of the eye is very similar to an electronic camera, and it is natural to discuss them together. Both are based on two major components: a lens assembly, and an imaging sensor. The lens assembly captures a portion of the light emanating from an object, and focus it onto the imaging sensor. The imaging sensor then transforms the pattern of light into a video signal, either electronic or neural. Figure shows the operation of the lens. In this example, the image of an ice skater is focused onto a screen.


Light enters the eye through the cornea, the clear front surface of the eye, which acts like a camera lens. Parts of Human Eye and Their Functions Understanding the different parts of our eye can help you understand how you see and what you can do to help keep the eye functioning properly. It provides most of the refraction of light. Ciliary muscle located on each human eye connects the choroid with the iris. The near point of an eye is also known as the least distance of distinct vision. The near point of a normal human eye is at a distance of 25 centimetres from the eye. The nearest point up to which the eye can see an object clearly without any strain, is called the near point of the eye.

light sensors sensing the image. A key difference between the human eye and the camera is in how the focusing is done. In your own eyes, when you look from​.

Lens Focal Length: Normal, Short, Long, Special Lenses

The lens is a transparent biconvex structure in the eye that, along with the cornea , helps to refract light to be focused on the retina. By changing shape, it functions to change the focal length of the eye so that it can focus on objects at various distances, thus allowing a sharp real image of the object of interest to be formed on the retina. This adjustment of the lens is known as accommodation see also below. Accommodation is similar to the focusing of a photographic camera via movement of its lenses. The lens is more flat on its anterior side than on its posterior side.

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