There was one participant with microbial keratitis , five participants with asymptomatic infiltrates , and seven participants with contact lens peripheral ulcers , providing KM survival estimates of 92.8 % ( 95 % CI , 88.6 to 96.9 % ) and 98.1 % ( 95 % CI , 95.8 to 100.0 % ) for remaining free from noninfectious and symptomatic CIEs , respectively .