After a follow-up study of 9 people wearing contact lenses and 11 people who did not wear contact lenses, the researchers found that compared with those without contact lenses, the average number of bacteria on the eyeball of people wearing contact lenses increased by an average of two times  There were also differences in the composition of eyeball surface flora between the two groups  Pseudomonas, a bacterium that causes corneal ulcer, is more common in the eyes of people with contact lenses
Since the emergence of soft contact lenses, the prevalence of corneal ulcer has increased significantly
 It can be seen that changing the flora in the eyes with contact lenses is more likely to lead to eye infection