Variation in sag values in daily disposable, reusable and toric soft contact lenses
| Autor: | Benjamin J. Coldrick, Beth T. Kinoshita, Patrick Caroline, Eef van der Worp, Mari J. Fujimoto, Matthew Lampa |
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| Rok vydání: | 2020 |
| Předmět: |
Potential impact
Materials science business.industry Instrumentation Spectral domain General Medicine Contact Lenses Hydrophilic law.invention Lens (optics) Clinical Practice Toric lens 03 medical and health sciences Ophthalmology 0302 clinical medicine Optics law Maximum difference Lens Crystalline 030221 ophthalmology & optometry Humans Daily disposable business 030217 neurology & neurosurgery Optometry |
| Zdroj: | Contact lensanterior eye : the journal of the British Contact Lens Association. 44(6) |
| ISSN: | 1476-5411 |
| Popis: | Purpose While knowledge of the ocular surface sagittal height (OC-SAG) is increasing with newer instrumentation, understanding of soft lens sag values (CL-SAG) in daily clinical practice is limited. This study aimed to report the differences in CL-SAG of a large collection of daily disposable (DD), reusable (2-week and 4-week replacement) and toric lens designs. Methods 12 different spherical DD and 15 reusable lens types were analysed (labelled power −3.00D); 17 different toric lens types analysed (6 DD and 11 reusable) in −3.00D =C 0.75 × 180. Posterior CL-SAG was measured directly using a spectral domain OCT-based instrument (Optimec is830). Results The range in CL-SAG for DDs was 3,398-3,912 microns, for reusable lenses 3,372-4,004 microns and for toric lenses 3,536-4,157 microns. Lens diameter and BC together influence CL-SAG values. For lenses with the same labelled base curve (BC), the maximum difference in the DD group was 264 microns, in the reusable group 418 microns and in the toric group 345 microns. Three lens designs within the DD group and five in the reusable group offer two BCs, with an average variation (±SD) in CL-SAG of 276 ± 39 microns; one toric lens with two BCs showed a 377-micron difference. Conclusions Marked differences in CL-SAG values were found in this study, also between lenses of the same BC. While ECPs should be aware that diameter and BC together influence CL-SAG, this also indicates that lens substitution based on BC alone could result in substantial differences in CL-SAG, with a potential impact on lens fit. Lens designs offering two BCs showed a somewhat narrow band in absolute terms in CL-SAG, and switching from a spherical to a toric lens of the same lens manufacturer could result in a significant change in CL-SAG. |
| Databáze: | OpenAIRE |
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