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Main content start

Eyecare course

 

Home | Introduction | Eye and Vision | Common eye problems in students | Common eye problems related to the use of digital screen devices | Management and prevention of Computer Vision Syndrome

 

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Eye and Vision

 

 2.1 Objective: To explain the generation of vision in human eyes   
 

 

By completing this chapter, you will learn the following list of topics:

  • The formation of visual images in our brain
  • Anatomy of a normal eye
  • Accommodation of eye
  • Comparison between a camera and an eye
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   2.2 How do we see while using Digital Screen Devices?
The human eye is an organ that gives us a sense of sight, allowing us to observe and learn about the surrounding world. Light enters the eye, and the cornea and lens focus it onto the retina. It is then processed by the photoreceptors within the retina, and transformed into electrical impulses. These impulses are in turn transmitted via the optic nerve to the visual cortex, the part of the brain that interprets and form an image for you to see.   #  

 

 Anatomy of a normal eye Video
 

Anatomy of a normal eye

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 2.3 How do we maintain clear and single vision while using digital screen devices? 
 

Like a camera, our eyes must be able to change focus in order to see clearly at near, such as at times when we read or use digital screen devices. This process is called accommodation, which acts like a reflex, using muscles within our eyes to change the shape and optical power of the lens, thereby maintaining clear near vision.

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Accommodation Video 

 

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 2.4 Summary

Congratulation! You have completed Chapter 2. You should now be able to understand the following topics

 

  • The formation of visual images in our brain
  • Anatomy of a normal eye
  • Accommodation an eye
  • Comparison between a camera and an eye