Nau Cherie B, Schornack Muriel M
Division of Optometry, Mayo Clinic, Rochester, MN.
Eye Contact Lens. 2018 Sep;44 Suppl 1:S210-S215. doi: 10.1097/ICL.0000000000000382.
Scleral lenses settle on the eye with time, and the depth of the postlens fluid reservoir decreases. We measured changes in central, superior, inferior, temporal, and nasal clearance beneath a small-diameter scleral lens after 2 hr of lens wear in healthy eyes.
Thirty-one participants (age, mean±SD, 29±7 years) with no history of eye disease or scleral lens wear were fitted with a 15-mm scleral lens in 1 eye. Scheimpflug images were acquired by a camera system within 5 min of lens placement and again after 2 hr of continuous lens wear. The central cornea was located in both horizontal and vertical meridians, and lens clearance was measured at that point. Lens clearance was also measured 2 mm superior, inferior, nasal, and temporal to the center of the cornea.
After 2 hr of lens wear, central clearance was reduced 46% (mean [SD], from 227 [77] to 122 [61] μm; P<0.001). Superior clearance was reduced 48% (from 168 [62] to 87 [61] μm); inferior clearance, 54% (from 241 [82] to 111 [55] μm); temporal clearance, 45% (from 224 [79] to 124 [74] μm); and nasal clearance, 52% (from 166 [73] to 80 [49] μm) (P<0.001 for all). Statistically significant decreases in clearance were noted at all points assessed after 2 hr of lens wear.
Fluid reservoir depth beneath small-diameter scleral lenses decreased nearly 50% after 2 hr of lens wear in normal eyes.
巩膜镜会随着时间推移贴合在眼睛上，且镜片后液体储存池的深度会减小。我们测量了健康眼睛佩戴小直径巩膜镜2小时后，镜片下中央、上方、下方、颞侧和鼻侧间隙的变化。
31名无眼部疾病或巩膜镜佩戴史的参与者（年龄，平均±标准差，29±7岁）单眼佩戴15毫米的巩膜镜。在镜片放置后5分钟内以及连续佩戴镜片2小时后，通过摄像系统获取Scheimpflug图像。在水平和垂直子午线上确定中央角膜的位置，并在该点测量镜片间隙。还在角膜中心上方、下方、鼻侧和颞侧2毫米处测量镜片间隙。
佩戴镜片2小时后，中央间隙减少了46%（平均值[标准差]，从227[77]微米降至122[61]微米；P<0.001）。上方间隙减少了48%（从168[62]微米降至87[61]微米）；下方间隙减少了54%（从241[82]微米降至111[55]微米）；颞侧间隙减少了45%（从224[79]微米降至124[74]微米）；鼻侧间隙减少了52%（从166[73]微米降至80[49]微米）（所有P<0.001）。佩戴镜片2小时后，在所有评估点均观察到间隙有统计学意义的减少。
正常眼睛佩戴小直径巩膜镜2小时后，镜片下液体储存池深度减少了近50%。
