Why should myopia stop wearing contact lenses before operation?

Abstract: stopping wearing contact lenses is one of the scientific procedures for myopia surgery. Experts say, The influence of corneal contact lens (contact lens) on corneal morphology and diopter varies from person to person. Depending on age and other differences, the stopping time may vary, depending on the specific situation.

When you go to the hospital for preoperative examination of myopia surgery, the medical staff will ask whether you have worn contact lenses and how long you have worn them, and then remind friends who wear contact lenses to stop wearing them for a certain period of time before seeing a doctor for examination. Why must we stop wearing contact lenses before myopia surgery? This is the question of many patients.

stopping wearing contact lenses is one of the scientific procedures for myopia surgery that must be observed. Experts say, The influence of corneal contact lens (contact lens) on corneal morphology and diopter varies from person to person. Depending on age and other differences, the stopping time may vary, depending on the specific situation.

purpose of stopping wearing contact lens:

  1. Make the cornea fully restore its original shape, so as not to affect the preoperative diopter examination, so as to affect the accuracy of surgical correction.

  2. Different types of corneal contact lenses (different materials, different radians, matching degree with corneal shape) and corneal contact lenses have different effects on corneal tissue (thickness, elasticity, etc.).

  3. Generally, the easily deformed cornea is also easy to restore the shape before wearing. But this kind of cornea should be paid attention to. Most of them are thin cornea or have the characteristics of keratoconus.

  4. The purpose of stopping wearing contact lenses is to restore the normal corneal epithelial cells, especially the damaged corneal epithelial cells.

  5. If keratitis is caused by contact lenses, it needs systematic treatment. After keratitis is completely controlled, the operation can be carried out only after inspection and confirmation.

therefore, contact lenses should be stopped before the examination and evaluation of laser corneal refractive surgery. According to the current clinical practice experience, soft contact lenses should be stopped for at least 3 days to 2 weeks, with an average of more than one week, according to the types of lenses (daily polishing, weekly polishing, monthly polishing, quarterly polishing and annual polishing) and wearing habits (occasional wearing and frequent wearing) and time. Hard contact lenses (corneal shaping lens or RGP) should be stopped for at least 3 months until the cornea returns to its original shape and the examination results are normal.