Do you use glasses? Do you use contact lenses? Do you know why?

It is most likely due to refractive errors. Refractive errors are not eye diseases though they are called eye disorders.

In order for the eyes to see light rays must be bent by the cornea and the lens so that it can focus on the retina. The retina receives the picture formed by the light rays and send it to the brain through the optic nerve.

Refractive errors occurs when the shape of the eye prevent light from focusing directly on the retina;the length of the eyeball, changes in the shape of the cornea or aging of the lens.


  1. MYOPIA (nearsightedness): light rays focus in front of the retina because the eyeball is longer than normal.
  • Close objects look clear but distant object appear blurred
  • Usually inherited
  • If the myopia is mild, it is known as low myopia but if severe, high myopia
  • High myopia predispose to retinal detachment.images-2


  1. Difficulty reading road signs and distance object clearly.
  2. Eye strain and headache.
  3. Feeling fatigue when driving or playing sports


  1. Prescription of concave (-ve) lenses.
  2. Contact lens
  3. Refractive surgery.
  4. Balance diet rich in vitamin A and protein.
  5. Low vision aids in progressive myopia.



  1. HYPEROPIA (farsightedness): light rays focus behind the retina because the eyeball is shorter than normal
  • Distant object look clear but near object appear blurred
  • Usually inherited
  • Babies and young children tend to be slightly hyperopic. As the eye grows and become longer, hyperopia lessens.
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  • Difficulty concentrating and maintaining a clear focus on near object,
  • Eye strain,
  • Fatigue or headache after close work,
  • Aching or burning eyes and irritability,
  • Or nervousness after sustained concentration.


  1. Prescription of convex (plus) lenses.
  2. Refractive eye surgery
  3. Contact lens

Of course, this topic is far from being over. Have a great week and I wouldn’t mind feedback.