Refractive Error

☛ What is refractive error?
A refractive error is a very common eye condition that can cause blurred or reduced vision. It occurs when the eye fails to focus precisely and accurately images from the outside world on to the retina.

☛ What are the different types of refractive errors?

There are different types of refractive errors which are classified broadly as

  • Myopia
    Also known as near sightedness where a person has difficulty in seeing clearly objects at distance



  • Hyperopia
    Also known as farsightedness where a person has difficulty in seeing clearly close objects.



  • Astigmatism
    This is a condition where there is distorted vision resulting from an irregularly curved cornea


  • Presbyopia
    This is not a refractive error. It is due to difficulty in reading or seeing at arm’s length usually starting after 40 years of age due to the loss of the ability of accommodation of the crystalline natural lens


☛ Can refractive errors be prevented?
No, Refractive errors cannot be prevented. They can be diagnosed and corrected with an eye examination.
How are refractive errors treated?

☛ Refrative errors can be treated with

  • Corrective glasses
  • Contact lenses
  • Refractive surgery
  • Surgical procedures like Implantable Collamer Lenses and Clear Lens Extraction in patients with very high refractive errors which may not be correctable by glasses/ contact lenses or refractive surgery