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Ulfah Rimayanti, Yoshiaki Kiuchi, Shohei Uemura, Joji Takenaka, Hideki Mochizuki, Makoto Kaneko; Ocular surface displacement with and without contact lenses during non-contact tonometry. Invest. Ophthalmol. Vis. Sci. 2014;55(13):2465.
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To evaluate the displacement of the central ocular surface during non-contact tonometry with and without soft contact lenses and determine the factors associated with the displacement of the central ocular surface and intraocular pressure (IOP) reading changes caused by wearing soft contact lenses (CLs).
One eye each in 21 subjects was studied. The cornea was photographed by a high speed camera at 5000 frames/sec during non-contact tonometry without contact lenses (NCL), with -5.0 diopters (D), -0.5 D and +5.0 D CL. The displacement of the ocular surface during the early phase (10-14.8 ms after an air puff application), the IOP readings phase (15-19.2 ms), the maximum displacement phase (19.4-23.6 ms) were averaged, and the factors affecting displacement were evaluated.
The IOP readings while wearing +5 D CL were significantly higher than those obtained while wearing -5 D CL. The ocular surface displacement between -5 D CL and +5 D CL, NCL and + 5 D CL during the early phase was significantly different. The average ocular surface displacements in the +5 D CL group during the IOP reading and maximum displacement phases were significantly different from that observed in the other groups. Significant positive correlation was found between the ocular surface displacement of subjects at the IOP reading time and the IOP obtained with non-contact tonometry. The radius of curvature of the ocular surface affected the displacement during the IOP reading and maximum displacement phases.
Our results indicate that soft contact lens use changes IOP readings and the ocular surface displacement during non-contact tonometry. The radius of curvature of the eye affects the extent of displacement and IOP readings in those with and without contact lenses.
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