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What is Refractive Errors of the Eye ?
What is Refractive Errors of the Eye, is :
- Myopia or nearsightedness ( - )
The image falls in front of the retina and is out of focus. Vision is clearer at close distance than at far. The lenght of the eye ball may be too long the power of the cornea too high.
- Hypermetropia or farsightedness ( + )
The image falls behind the retina. Vision is cleare at far distances than at near. The lenght of the eye ball may be too short or the power of the cornea too short.
.jpg "Hypermetropia or farsightedness ( + )") |
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This is a structral defect of the eye that prevents light ray from an object from meeting in a single point, so that indistinct images are formed. This occurs of round. Vision can be blurry or shadowy at distance or near.
The crytelline lens of the eye become less resilient and loses its elasticity with age. As a person ages, he loses the ability to focus clearly at the reading distance. The ages at which this occurs varies, but is generally around age 40
.jpg "Myopia or nearsightedness ( - )")
.jpg "Hypermetropia or farsightedness ( + )")
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