Soft and Hard Contact Lenses Worn in Combination

Key Points

• The research aims to evaluate the effects of combining soft and hard contact lenses on corneal swelling and visual acuity.
• Fitted subjects with various combinations of soft and hard contact lenses.
• Monitored corneal edema after a 5-hour wear period.
• Compared visual acuity with the combination system to individual lens types.
• Least corneal edema was observed with ultrathin soft lenses combined with best-fit PMMA or CAB lenses.
• Keratoconus subjects experienced 1.7% and 5.3% corneal swelling after 5 hours.
• Visual acuity improved with combined contact lens systems compared to using soft or hard lenses alone.