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S. Xu, F. Lu, J. Jiang, X. Mao, W. Jin, J. Qu; Corneal Sensitivity Change After Wearing Contact Lens . Invest. Ophthalmol. Vis. Sci. 2005;46(13):2070.
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Purpose: To evaluate corneal sensitivity variation after wearing different types of contact lens in children and adults. To determine the association of corneal sensation change with contact lens wear period. Methods: A total of 80 subjects (160 eyes) were recruited. Subjects completed an extensive questionnaire regarding age, type of contact lens, wearing periods, daily wearing time, diseases associated with corneal sensitivity change; Corneal sensitivity at central, temporal, nasal, superior and inferior locations was assessed using Cochet and Bonnet aesthesiometer. Contact lens wearer subjects were grouped according to age (≤15y, >15y), wearing duration(≤1y,1–5y), and lens type (soft contact lens (SCL) vs. rigid gas permeable (RGP) lens). Results:1.In children (≤15yrs) wearing RGP lenses we found that (1) Central and inferior corneal sensitivity was significantly decreased in subjects wearing lenses for less than one–year or one–to–five–years (central: ≤1y P=0.000, 1–5y P=0.000; inferior: ≤1y P=0.002, 1–5y P=0.000). No significant difference was found between one year and 1–5 years wear group (central P=0.997, inferior P=0.056); (2)Nasal , temporal and superior corneal sensitivity significantly decreased for 1–5 years wear group(temporal=3.2350±1.53838, P=0.000; nasal= 3.1650±1.5742, P=0.000; superior=3.8625±2.7623, P=0.001) but was not affected in subjects wearing RGP lenses for one year or less (temporal=2.0167± 1.62527, P=0.06; nasal=1.9192±1.62197, P=0.200; superior=2.2583±2.11207, P=0.207). 2.In adults (>15yrs) wearing RGP lenses we found that (1)Central corneal sensitivity significantly decreased in subjects wearing lenses for less than one–year or one–to–five–years(P=0.000).No significant change between these two groups was observed(P=0.921);(2)There was no significant difference in CTT(cornea touch threshold) between high–Dk RGP lens and low–Dk RGP lens for the one–year–wear group(P=0.263);(3)The effect of soft lens on central corneal sensitivity was similar to RGP lens(1y P=0.239,1–5y P=0.366). 3.There was no significant difference between children and adults for central corneal sensitivity change after wearing RGP lens(1y P=0.343,1–5y P=0.105) Conclusions:The loss of sensitivity induced by wearing RGP appears to plateau after the first few months. The effect of wearing RGP lenses on corneal sensitivity loss in children and adults is similar. Both soft contact lens and RGP lens produce a similar type of corneal sensitivity loss.The mechanism for changes in sensitivity resulting from RGP wear is sensory adaptation to mechanical stimulation.
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