Question

Recently, LASIK (Laser-Assisted in situ Keratomileusis) procedure is begin made popular for vision correction. Which one of the following statements in this context is not correct? 
1. LASIK procedure is used to correct refractive errors of the eye
2. It is a procedure that permanently changes the shapes of the cornea 
3. It reduces a person's dependence on glasses or contact lenses
4. It is a procedure that can be done on the person of any age

Answer 1

Correct Answer - Option 4 : It is a procedure that can be done on the person of any age

The correct answer is It is a procedure that can be done on a person of any age.

• In order to undergo the LASIK procedure, one should be at least 18 years old, as the vision of people younger than 18 usually continues to change.
• LASIK involves cutting of the cornea hence it may lead to a change in the shape of the cornea. Hence option 2 is correct.
• The FDA stipulates the correct minimum age of 18 years for most situations.
• Hence it cant be done at every age. hence option 4 is not correct.
• LASIK is a type of refractive surgery for the correction of myopia, hyperopia, and astigmatism.
• LASIK surgery is performed by an ophthalmologist who uses a laser or microkeratome to reshape the eye's cornea in order to improve visual acuity
• For most people, LASIK provides a long-lasting alternative to eyeglasses or contact lenses Hence Option 3 is correct.

• Defects of Vision:-
• Myopia
  • Myopia is also known as near-sightedness.
  • A person with myopia can see nearby objects clearly but cannot see distant objects distinctly.
  • A person with this defect has the far point nearer than infinity.
  • Such a person may see clearly up to a distance of a few meters.
  • In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself.
• Hypermetropia
  •   Hypermetropia is also known as farsightedness.
  • A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly.
  • The near point, for the person, is farther away from the normal near point (25 cm).
  • Such a person has to keep a reading material much beyond 25 cm from the eye for comfortable reading.
  • This is because the light rays from a close-by object are focused at a point behind the retina.
• Presbyopia
  • The power of accommodation of the eye usually decreases with ageing.
  • For most people, the near point gradually recedes away.
  • They find it difficult to see nearby objects comfortably and distinctly without corrective eyeglasses.
  • This defect is called Presbyopia.
  • It arises due to the gradual weakening of the ciliary muscles and diminishing flexibility of the e  ye lens.