Question

The Human eye in detail in point step by step ?

Answer 1

The eye is made up of a number of parts, including the iris, pupil, cornea, and retina.The eye has six muscles which control the eye movement, all providing different tension and torque.The eye works a lot like a camera, the pupil provides the f-stop, the iris the aperture stop, the cornea resembles a lens. The way that the image is formed is much like the way a convex lens forms an image.

Key Terms

pupil: The hole in the middle of the iris of the eye, through which light passes to be focused on the retina.aperture: The diameter of the aperture that restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens (e.g., a telescope may have a 100 cm aperture).

Answer 2

When surveyed about the five senses — sight, hearing, taste, smell and touch — people consistently report that their eyesight is the mode of perception they value (and fear losing) most.

Despite this, many people don't have a good understanding of the anatomy of the eye, how vision works, and health problems that can affect the eye.

Read on for a basic description and explanation of the structure (anatomy) of your eyes and how they work (function) to help you see clearly and interact with your world.

How The Eye Works

In a number of ways, the human eye works much like a digital camera:

Light is focused primarily by the cornea — the clear front surface of the eye, which acts like a camera lens.

The iris of the eye functions like the diaphragm of a camera, controlling the amount of light reaching the back of the eye by automatically adjusting the size of the pupil (aperture).

The eye's crystalline lens is located directly behind the pupil and further focuses light. Through a process called accommodation, this lens helps the eye automatically focus on near and approaching objects, like an autofocus camera lens.

Light focused by the cornea and crystalline lens (and limited by the iris and pupil) then reaches the retina — the light-sensitive inner lining of the back of the eye. The retina acts like an electronic image sensor of a digital camera, converting optical images into electronic signals. The optic nerve then transmits these signals to the visual cortex — the part of the brain that controls our sense of sight.