Refractive Error

What is Refractive Error?

Refractive error is an eye disorder, in which the patient has a distorted eye shape and vision. Technically it means that the eye is not reflecting the light properly, and therefore the patient will suffer from blurred vision. It is a common eye disorder. Initially,the patient will not be able to focus properly,

and if the condition becomes severe, the patient is likely to experience total blindness. This eye disorder is not a preventable condition but is treatable. A simple eye test can help in the diagnosis of this condition, and timely correction will save the patient from any additional medical complexities.


Some of the most probable causes of this disease are:

  • Myopia - Close objects are clear, and distant objects are blurry. It is also known as nearsightedness and often inherited
  • Hyperopia - Close objects are more blurry than distant objects. It is also known as farsightedness, and can also be inherited
  • Presbyopia - Aging of the lens in the eye.
  • Astigmatism - It usually occurs when the front surface of the eye, the cornea, has an asymmetric curvature

Who needs Refractive surgery?

  • Patients may need or want to remove spectacles for various purposes including vocational (army, navy, marine, pilot, etc) and cosmetic issues
  • Patients may not be able to wear contact lens because of contact lens intolerance or vocational issues (like sports).

Types of Surgeries:

  • LASIK - LASIK, or laser in-situ keratomileusis, works for people who are nearsighted, farsighted, or have astigmatism. The doctor makes a flap in the outer layer of the cornea to get to the tissue underneath. He then uses a laser to reshape the tissue underneath your cornea so it can focus light properly
  • PRK - PRK, or photorefractive keratectomy, is used to correct mild to moderate nearsightedness, farsightedness, or astigmatism. Like LASIK, a surgeon uses a laser to reshape your cornea
  • 3. Intraocular lenses are artificial lenses inserted into the eyes to replace natural lenses damaged by conditions such as cataracts
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