The incidence of diffuse lamellar keratitis (DLK)[6], also known as the Sands of Sahara syndrome, has been estimated at 2.3%.[21] When diagnosed and appropriately treated, DLK resolves with no lasting vision limitation. The incidence of infection responsive to treatment has been estimated at 0.4%.[21] Infection under the corneal flap is possible. It is also possible that a patient has the genetic condition keratoconus that causes the cornea to thin after surgery. Although this condition is screened in the preoperative exam, it is possible in rare cases (about 1 in 5,000) for the condition to remain dormant until later in life (the mid-40s). If this occurs, the patient may need rigid gas permeable contact lenses, Intrastromal Corneal Ring Segments (Intacs),[22] Corneal Collagen Crosslinking with Riboflavin[23] or a corneal transplant. The incidence of persistent dry eye has been estimated to be as high as 28% in Asian eyes and 5% in Caucasian eyes.[5] Nerve fibers in the cornea are important for stimulating tear production. A year after LASIK, subbasal nerve fiber bundles remain reduced by more than half.[24] Some patients experience reactive tearing, in part to compensate for chronic decreased basal wetting tear production. The incidence of subconjunctival hemorrhage has been estimated at 10.5%.[21]
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The incidence of epithelial ingrowth has been estimated at 0.1%.[21]
Glare is another commonly reported complication of those who have had LASIK.[25]
Halos or starbursts around bright lights at night are caused by the irregularity between the lasered...
Patients are usually given a course of antibiotic and anti-inflammatory eye drops. These are discontinued in the weeks following surgery. Patients are also given a darkened pair of goggles to protect their eyes from bright lights and protective shields...
The incidence of refractive surgery patients having unresolved complications six months after surgery has been estimated from 3%[4] to 6%.[5] The following are some of the more frequently reported complications of LASIK[6][5]:
Surgery induced dry eyes...
Although there have been improvements in LASIK technology[28][29][30] , a large body of conclusive evidence on the chances of long-term complications is not yet established. Also, there is a small chance of complications, such as slipped flap, corneal...
Some complications of PRK include:
Long healing period
Pain
Glare, halos, or starburst Aberrations
Under- or over-correction
Recurrence of myopia
Increased intraocular pressure
Corneal haze
Scarring
Reduced best corrected visual acuity...
The incidence of flap complications has been estimated to be 0.244%.[16] Flap complications (such as displaced flaps or folds in the flaps that necessitate repositioning, diffuse lamellar keratitis, and epithelial ingrowth) are common in lamellar corneal...
Although relatively uncommon, the following are some of the more frequently reported complications of Epi-LASIK [1]:
Over/undercorrection
Visual acuity fluctuation
Halos around light sources
Starbursts around light sources
Decentered ablation...