Iskeleli G, Oral A Y, Celikkol L
Department of Ophthalmology, Cerrahpasa Medical Faculty, University of Istanbul, Turkey.
CLAO J. 1996 Apr;22(2):133-5.
In this study we assessed patients' clinical tolerance to extended wear of Hoya Hard EX contact lenses, which have a Dk of 125, and determined resulting changes in corneal radius and thickness.
Hoya Hard EX rigid gas permeable contact lenses (Dk = 125) were fitted to 57 eyes of 29 patients; all eyes were free of pathology. The average duration of contact lens wear was 5.28 +/- 1.43 days. Changes in the radius and thickness of the cornea were measured after 1,3, and 6 months of lens wear.
At 1 month, keratometer readings indicated significant flattening in both the horizontal (P < 0.01) and vertical meridians (P < 0.001). At 3 and 6 months, the flattening of both meridians had become more significant (P < 0.001). Although there were no statistically significant changes in corneal thickness at 1 month, significant decreases in thickness were observed at 3 and 6 months (P < 0.001). During the study, patients' vision was stable and lens wear caused no serious complications. At the end of the study, all 29 patients continued extended wear of their contact lenses.
High-Dk RGP contact lenses are an alternative to soft lenses for extended wear.
在本研究中，我们评估了患者对Dk值为125的豪雅Hard EX隐形眼镜长期佩戴的临床耐受性，并确定了角膜半径和厚度的相应变化。
为29例患者的57只眼佩戴豪雅Hard EX硬性透气性隐形眼镜（Dk = 125）；所有眼睛均无病变。隐形眼镜的平均佩戴时长为5.28 +/- 1.43天。在佩戴镜片1、3和6个月后测量角膜半径和厚度的变化。
1个月时，角膜曲率计读数显示水平子午线（P < 0.01）和垂直子午线（P < 0.001）均有明显变平。在3个月和6个月时，两条子午线的变平更为显著（P < 0.001）。虽然1个月时角膜厚度无统计学显著变化，但在3个月和6个月时观察到厚度显著下降（P < 0.001）。在研究期间，患者视力稳定，佩戴镜片未引起严重并发症。研究结束时，所有29例患者继续长期佩戴他们的隐形眼镜。
高Dk值的硬性透气性隐形眼镜是长期佩戴软性隐形眼镜的一种替代选择。
