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- W2790267384 abstract "Purpose To develop a methodology to reliably determine the thickness profile of scleral contact lenses and examine the relationship between the centre and average lens thickness for a range of lens designs and back vertex powers. Methods High-resolution images of 37 scleral trial lenses (Epicon LC, Rose K2 XL and ICD 16.5) were captured using an optical coherence tomographer, and their thickness profiles were generated after correcting for known measurement artefacts. Centre lens thickness values were compared with manual lens gauge measurements, and repeatability was assessed by comparing average thickness values derived from orthogonal meridians of each lens. Results The imaging technique displayed a high level of agreement with a manual lens gauge for centre thickness measurements; mean difference 5 ± 9 μm (95% LoA −14 to +23 μm), and a very high level of repeatability; mean difference between orthogonal meridians 1 ± 3 μm (95% LoA −6 to +8 μm). Lens thickness profiles varied between lens designs, with distance from the lens centre, and with back vertex power. Increasing back vertex powers resulted in a significant over or underestimation (up to 33% for high minus powers) of the average lens thickness based on the centre lens thickness. Conclusions The thickness of scleral contact lenses varies with distance from the lens centre and the back vertex power. The average lens thickness value derived from the entire lens provides a more appropriate representation of the true lens thickness and should be used in the calculation of scleral lens oxygen transmissibility." @default.
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- W2790267384 date "2019-02-01" @default.
- W2790267384 modified "2023-10-16" @default.
- W2790267384 title "Scleral contact lens thickness profiles: The relationship between average and centre lens thickness" @default.
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- W2790267384 doi "https://doi.org/10.1016/j.clae.2018.03.002" @default.
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