ArticlePloS one2020
Which feature influences on-eye power change of soft toric contact lenses: Design or corneal shape?
Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
7 citing papers in PubMed, 12 citations in OpenAlex.
- The Behaviour of Contaflex Soft Contact Lens Material During Hydration.Gels (Basel, Switzerland) · 2025Article
- Unraveling the impact of laser refractive surgery on corneal ectasia: anFrontiers in bioengineering and biotechnology · 2025Article
- Influence of Contact Lens Parameters on Cornea: Biomechanical Analysis.Bioengineering (Basel, Switzerland) · 2024Article
- FEA-Based Stress-Strain Barometers as Forecasters for Corneal Refractive Power Change in Orthokeratology.Bioengineering (Basel, Switzerland) · 2024Article
- Article
- Limitations of Reconstructing Pentacam Rabbit Corneal Tomography by Zernike Polynomials.Bioengineering (Basel, Switzerland) · 2022Article
- Compressive behaviour of soft contact lenses and its effect on refractive power on the eye and handling off the eye.PloS one · 2021Article
Corrections and comments
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Authors and funding
11 authors at 4 institutions in 5 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThis study investigates how both the peripheral zone design and corneal shape affect the behaviour of soft contact lenses on-eye.
methodsIn this study, soft contact lenses of varying nominal cylindrical powers and peripheral zone designs-a single-prism gravity-based stabilised lens (G1P), two-prism blink-based stabilised lens (B2P) and four-prism blink-based stabilised lens (B4P)-were generated as finite element models. The on-eye simulation results were analysed to identify the impact of each peripheral zone design (Each with different volume ratios) on the effective power change (EPC) when worn by a subject. Topographies of three eyes of varying average simulated anterior corneal curvature (flat, average & steep) were used in this study.
resultsThe volume of the lens's peripheral zone as a ratio of the total lens volume (Vp) recorded very weak correlations with the effective power change (EPC) among the three investigated designs when they were fitted to the flat eye (R = -0.19, -0.15 & -0.22 respectively), moderate correlations with the average eye (R = 0.42, 0.43 & 0.43 respectively) and strong correlations with the steep eye (R = 0.91, 0.9 & 0.9 respectively). No significant differences were noticed among the three investigated designs and none of the cylindrical lenses designed with axis 90° recorded EPC values outside the acceptance criteria range (ACR) of ±0.25 D. No significant differences in EPC were recorded among the three designs G1P, B2P and B4P (p>0.6) when they were designed with three axes at 90°, 45° and 0°. Moving the toric lens axis away from 90° dragged the EPC to the negative side and most of the investigated lenses with axes at 45° and 0° recorded EPCs outside the ±0.25D range.
conclusionsIn all cases, the shape of the cornea had a more dominant effect on EPC when compared to the peripheral zone design. Corneal shape influences the soft toric contact lens's on-eye power change more than the lens design.
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