Irregular Corneas Due to Refractive surgery

During laser eye surgery the cornea is reshaped in order to correct the prescription. Very occasionally in some eyes the healing process leaves the corneal surface slightly irregular, leading to a loss of sharpness. In these individuals, contact lenses can restore clarity or reduce the glare and halos that occur due to light being scattered by an irregular cornea.  
Because the shape of the cornea is very different to that which normal contact lenses are designed for, special lenses, known as reverse geometry contact lenses are required. They are rigid gas permeable and they work by masking the irregularities. 
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