Sagittal height differences of frequent replacement silicone hydrogel contact lenses

被引:14
作者
van der Worp, Eef [1 ]
Mertz, Cristian [2 ]
机构
[1] Maastricht Univ, NL-6200 MD Maastricht, Netherlands
[2] Microiens Contact Lens Technol, Arnhem, Netherlands
关键词
Soft contact lenses; Silicone hydrogels; Frequent replacement; Lens fitting; Sagittal height; Base curve radius;
D O I
10.1016/j.clae.2015.01.004
中图分类号
R77 [眼科学];
学科分类号
100212 [眼科学];
摘要
Purpose: This study aims to evaluate the sagittal height differences among a selection of commercially available monthly or two weekly replacement silicone hydrogel soft lenses. Methods: The sagittal height (CL-SAG) of four frequent replacement silicone hydrogel lenses (lotrafilcon B, balafilcon A, comfilcon A and senofilcon A) was measured for all base curve radius manufactured in spherical (-3.00 D and +3.00 D) and toric (=C -0.75 x 180 degrees) designs (11 spherical and 8 toric lenses in total). Two different lenses of each lens type were evaluated (the intra CL-SAG) using the SHSOphthalmic omniSpect by Optocraft. Results: The intra CL-SAG difference (the difference between two identical lenses from the same batch) was 11 perpendicular to SD 2 mu m. The CL-SAG of all minus lenses ranged from 3454 to 3765 mu m (an inter CL-SAG difference of 311 mu m), while the plus spherical lenses ranged from 3493 to 3757 mu m (inter CL-SAG difference 264 mu m). In the toric lens group, the range in toric minus lenses was 3495-3953 mu m (inter CL-SAG difference 458 mu m) and 3493-3980 mu m in the plus group (inter CL-SAG difference 487 mu m). The inter CL-SAG difference between the spherical and the toric lenses was statistically significant (p = 0.03). Conclusion: Marked differences in sagittal height among different commercially available frequent replacement silicone hydrogel lenses exist. Different lenses with the same package base curve value had marked differences in CL-SAG, with potential clinical significance on-eye in terms of lens behavior. The inter CL-SAG variance in the spherical lens group was smaller than in the toric lens group. (C) 2015 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:157 / 162
页数:6
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