Causes and symptoms of keratoconus after myopia surgery

Any surgery has side effects, and myopia surgery is no exception. Myopia surgery keratoconus is one of them. Myopia surgery Keratoconus is the most common corneal abnormality, which is first manifested by decreased naked eye vision due to hyperopia and hyperopic astigmatism, and the astigmatism is high and often accompanied by irregular astigmatism.

1. Causes of keratoconus after myopia surgery

1. Genetic theory: Many scholars believe that this disease is autosomal recessive

2. Developmental disorder theory: This is caused by the central part of the cornea having a reduced resistance and poor toughness and cannot resist normal intraocular pressure.

3. The endocrine disorder theory believes that hypothyroidism has an important relationship with the occurrence of this disease

4. Metabolic disorder theory: The zinc and nickel levels in the patient's blood are significantly reduced, the titanium, lead and aluminum levels are increased, and the manganese level is normal. Therefore, it is believed that the changes in these trace elements have a certain impact on the occurrence of this disease.

5. Allergy theory: Keratoconus in myopia surgery often occurs simultaneously with allergic diseases such as spring catarrhal keratoconjunctivitis. 86% of patients with this disease have a history of allergic reactions.

2. Symptoms of keratoconus after myopia surgery

Screening for suspected myopia surgery keratoconus Like suspected glaucoma, suspected myopia surgery keratoconus is a general term for those who have a clinical tendency to develop myopia surgery keratoconus, but may not eventually develop into myopia surgery keratoconus syndrome, including the following aspects:

1. There is a family history of keratoconus caused by myopia surgery.

2. One eye has been diagnosed with myopic keratoconus, and corneal topography examination of the fellow eye revealed a slight steepening of one quadrant of the cornea.

3. No clinical symptoms, good visual acuity or corrected visual acuity.

4. Those who have no obvious signs of keratoconus after myopia surgery, but have the following conditions:

1) High corneal astigmatism.

2) Simk＞47.00D.

3) Slight decrease in corneal regularity.

4) When myopia and astigmatism progressively increase, the high corneal astigmatism and corneal curvature are higher than those of normal people.