Some people do not have enough tears on the surface of their eye to lubricate the eye and keep it comfortable; this is known as dry eye syndrome.
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Risks associated with vitrectomy are retinal detachment, bleeding, iatrogenic (medically caused) cataracts, and endophthalmitis (inflammation of the eyeball).

CASE PRESENTATION: A 52-year-old male underwent bilateral RK in 1997 for -6.50 D of myopia. He developed a progressive hyperopic drift in his left eye and subsequently underwent LASIK in that eye with a Hansatome microkeratome (Bausch & Lomb, Rochester, NY) and the Visx Star S4 excimer laser (Advanced Medical Optics, Inc., Santa Ana, CA) in October 2007.

An overseas Vietnamese has asked the Saigon Eye Hospital to compensate him with US$85,000 for a cataract operation that has cost him his cornea. But the Saigon Eye Hospital has refused the demand, saying the demand was unreasonable since they had done nothing wrong, the local newswire Vnexpress reported.