Pacific University College of Optometry, USA.
Pacific University College of Optometry, USA.
Cont Lens Anterior Eye. 2024 Jun;47(3):102160. doi: 10.1016/j.clae.2024.102160. Epub 2024 Apr 3.
To investigate the differences in contact lens sagittal depth (CL-SAG), base curve (BC), and overall lens diameter (OAD) of daily disposable (DD) SCLs at room temperature (20 °C) and on-eye (34 °C) temperature.
Twelve different spherical daily SCLs were analyzed (labeled power -3.00 D) at 20 °C and 34 °C. The posterior CL-SAG, BC, and OAD were measured directly using a spectral domain OCT-based instrument (Optimec is830).
The CL-SAG range for the daily disposable lenses measured at 20 °C was 3468-4016 µm. At 34 °C, the DD CL-SAG of all lenses individually decreased compared to 20 °C (t = 7.78, p < 0.001), ranging from 3385 to 3913 µm. On average at the higher temperature, the measured overall lens diameter was smaller (t = 8.18, p < 0.001) and the BC was marginally steeper (t = 2.11, p = 0.058).
Soft lens parameters change when equilibrated from room temperature (20 °C) to on-eye temperature (34 °C). All lenses shrink when going to on-eye temperature (both lens diameter and CL-SAG decreases), compared to lenses measured at room temperature by ISO standards. Higher water content materials tend to have greater changes to the lens parameters compared to lower water content material lenses.
研究室温（20°C）和眼部温度（34°C）下日戴型软性隐形眼镜（SCL）的矢高（CL-SAG）、基弧（BC）和总直径（OAD）的差异。
在 20°C 和 34°C 下分析了 12 种不同的球形日戴型 SCL（标记为-3.00 D）。使用基于光谱域 OCT 的仪器（Optimec is830）直接测量后 CL-SAG、BC 和 OAD。
在 20°C 下测量的日戴型隐形眼镜的 CL-SAG 范围为 3468-4016 µm。在 34°C 时，与 20°C 相比，所有镜片的 DD CL-SAG 均单独降低（t=7.78，p<0.001），范围为 3385-3913 µm。平均而言，在较高温度下，测量的总镜片直径较小（t=8.18，p<0.001），BC 略陡峭（t=2.11，p=0.058）。
软性隐形眼镜参数在从室温（20°C）平衡到眼部温度（34°C）时会发生变化。与 ISO 标准在室温下测量的镜片相比，所有镜片在进入眼部温度时都会收缩（镜片直径和 CL-SAG 都会减小）。与低含水量材料的镜片相比，高含水量材料的镜片参数变化更大。
