Refractive Errors

1. What Is Myopia

A short-sighted eye is longer than normal. Light rays focus in front of the retina rather than on the retina. Myopia often progresses throughout the teenage years, when the body is growing rapidly. The main symptom is difficulty in seeing distant objects clearly.




Causes of Myopia

  • Genetic Factor
  • Environment: Performed the most amount of near work
  • In Asia, especially in Hong Kong, children have a higher amount of myopia (because Asian children have more homework)

2. What Is Hyperopia?

A long-sighted or hyperopic eye is shorter than normal. Light rays focus behind the retina and closed objects look blurred. The main symptom is difficulty in seeing near objects.


Causes of Hyperopia

  • Genetic Factor

3. What Is Astigmatism

Astigmatism is a common and usually minor eye condition that causes blurred vision. It occurs when your eyeball, the cornea or lens isn't a perfectly curved shape. When light goes through the lens, it bends evenly and gives you a very clear view. When your eye is not perfectly round, light gets bent more in one direction than another thus the light gets scattered thus only part of an object is being focused. Objects at a distance may look blurry and unclear.




Causes of Astigmatism

  • Genetic Factor
  • Have had eye injury or eye disease
  • Contact Lens-Related Eye Infections
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