Abstract
The geometry of contact lenses can be altered by wear but determining the changes that occur in soft contact lenses (SCLs) is challenging. This study aimed to investigate the shape alterations of daily disposable SCLs after wear using swept-source optical coherence tomography (SS-OCT). Forty-five eyes with myopia of − 3.00 diopters (D) were enrolled. The participants wore three types of SCLs: hydrogel lens (nesofilcon A) and silicone hydrogel lenses (delefilcon A and stenfilcon A). The SCLs were scanned 3–6 min after lens removal. We found a significant decrease in the SCL anterior curvature: 0.24 ± 0.17 mm for nesofilcon A, 0.44 ± 0.21 mm for delefilcon A, and 0.53 ± 0.29 mm for stenfilcon A. The changes in the anterior curvature of SCLs correlated moderately with the mean corneal keratometry; Pearson’s correlation coefficients for nesofilcon A and delefilcon A were 0.57 and 0.52, respectively (P < 0.001). A statistically significant change in the total diameter was observed in SCL made of stenfilcon A (0.39 mm, P < 0.001). To conclude, the central radii of curvature decreased after a wearing period for all three types of daily disposable SCLs to imitate the anterior corneal surface, however, the changes in other geometrical parameters measured with SS-OCT were lens-specific.
Highlights
The geometry of contact lenses can be altered by wear but determining the changes that occur in soft contact lenses (SCLs) is challenging
This knowledge might be useful in the development of new designs and materials for daily disposable SCLs, which are supposed to be the type of lenses most frequently used in the future, especially considering the revolutionary projects of SCLs containing electronic c omponents[11,12,13]
This study aims to evaluate the changes in geometric parameters of three types of daily disposable SCLs for low myopia after a whole day of wear using swept-source optical coherence tomography (SS-Optical coherence tomography (OCT))
Summary
The geometry of contact lenses can be altered by wear but determining the changes that occur in soft contact lenses (SCLs) is challenging. The central radii of curvature decreased after a wearing period for all three types of daily disposable SCLs to imitate the anterior corneal surface, the changes in other geometrical parameters measured with SS-OCT were lens-specific. Geometrical interactions between SCLs and the surface of the eye have a significant impact on the lens performance in terms of comfort and vision q uality[8,9,10] This knowledge might be useful in the development of new designs and materials for daily disposable SCLs, which are supposed to be the type of lenses most frequently used in the future, especially considering the revolutionary projects of SCLs containing electronic c omponents[11,12,13]. As shown, measuring all important geometrical parameters of SCLs requires the use of several devices with different specificities
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