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Study: Overnight contact lens wear may increase corneal sensitivity
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A recent study examining the changes in corneal sensitivity after overnight of wear different types of contact lenses found that the mechanical force exerted by the lenses may influence corneal sensitivity.
In the study, 20 young adult subjects wore a silicone hydrogel, a gas-permeable lens and an orthokeratology (ortho-K) lens each overnight for one night in a randomized order and only in the right eye.
Significant corneal topographic change was observed among the lens types for corneal apical radius, asphericity and corneal refractive power. Significant corneal sensitivity changes were also observed among the lens types. Corneal sensitivity differences from baseline for silicone hydrogels was 0.02 g/mm2, 0.03 g/mm2 for gas-permeables and 0.22 g/mm2 for ortho-k lenses, the last of which was the only significant increase (P = .006).
“Central corneal sensitivity is reduced after a single overnight wear of ortho-K lenses, as measured using the Cochet-Bonnet aesthesiometer,” the study authors concluded.
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