Table 2

Frequency of symptoms reported by patients treated with preserved and preservative free eye drops at the first visit

Preserved eye drops (n=3469)Preservative free eye drops (n=552)
*Preservative free versus preserved comparison: p<0.001 (χ2 test).
Discomfort upon instillation43%17%*
    Foreign body sensation31%14%*
    Stinging or burning sensation40%22%*
    Dry eye sensation23%14%*
    Eyelid itching18%10%*
Presence of symptoms of irritation between instillations61%36%*