A study found that although numerous demographic and contact lens-related factors affect frequency of contact lens wear, overall wear may be trending to lower frequency with the increasing popularity of daily disposables, the authors speculated.
Data on 74,510 soft lens fits and 9,014 gas-permeable (GP) lens fits were collected from contact lens fitters and practitioners in about 40 countries between January and March for 5 consecutive years.
The mean frequency of wear was found to be 5.9 days per week. Considering soft and GP lenses separate from each other, GP lens wear gravitated toward full-time, 7 days per week, while soft daily disposables tended to have small and large peaks at 2 and 7 days.
Significant variation in frequency of wear was found among the different nations data were drawn from, ranging from 6.8 days per week on average in Greece to 5.1days in Kuwait (P< .0001).
Frequency of wear for soft contact lenses increased among younger patients. The study also found that females wore lenses more frequently than males (6.0 days per week vs. 5.8 days per week; P= .0002) and that frequency of wear was greater among presbyopes (6.1 days) than among those wearing spherical and toric designs (both 5.9 days; P< .0001).
Also, use of hydrogel peroxide systems was greater than multipurpose systems (6.4 days per week vs. 6.2 days per week; P< .0001).