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- What Types of Refractive Errors Cause Poor Vision?


Myopia (Short-sightedness or Near-sightedness)

The myopic eye is longer than normal and distant images are focused in front of the retina instead of on it, causing a blurred image. Someone with myopia will see near objects clearly, but distant objects will be blur.


Hyperopia (Long-sightedness or Far-sightedness)

The hyperopic eye is shorter than normal and images are focused behind the retina, leading to a blurred image. Someone with hyperopia will see distant objects clearly but objects that are nearby will be blur.

Astigmatism

The astigmatic cornea is unevenly curved, resulting in blurred and multiple distorted images. This affects distant and near objects equally. Astigmatism may co-exist with myopia or hyperopia.

Presbyopia (Old-sightedness)

In presbyopia, the eye loses its ability to focus on near objects. It is caused by ageing and usually begins around 40 years of age. With time, presbyopia will progress and worsen, necessitating reading glasses. LASIK cannot prevent or correct presbyopia.


- Dangers of Myopia

- How Do You Correct Poor Vision Due to Refractive Errors?