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Sagittal height differences of frequent replacement silicone hydrogel contact lenses
Eef van der Worp1, Cristian Mertz2
1University of Maastricht, Maastricht, The Netherlands.
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 (-3.00D and +3.00D) and toric (=C-0.75×180°) 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±SD 2μm. The CL-SAG of all minus lenses ranged from 3454 to 3765μm (an inter CL-SAG difference of 311μm), while the plus spherical lenses ranged from 3493 to 3757μm (inter CL-SAG difference 264μm). In the toric lens group, the range in toric minus lenses was 3495-3953μm (inter CL-SAG difference 458μm) and 3493-3980μm in the plus group (inter CL-SAG difference 487μm). 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.
