Diurnal Variations in Myopia After the Wearing of Contact Lenses∗

Key Points

• To investigate how myopia changes with the duration of contact lens wear throughout the day.
• Tested eight habitual contact lens wearers at baseline and after 4, 8, and 16 hours of lens wear.
• Measured myopia after removing the lenses at each time point.
• Analyzed changes in refraction over the wearing period.
• Myopia increased from baseline to 8 hours of lens wear.
• Myopia slightly decreased from 8 to 16 hours.
• Mean changes in diopters (D) were 0.82 D at 4 hours, 0.97 D at 8 hours, and 0.85 D at 16 hours.