Changes in the geometry of modern daily disposable soft contact lenses during wear

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.

Evaluation of Celligent® Biomimetic Water Gradient Contact Lens Effects on Ocular Surface and Subjective Symptoms

“…The provided information on tear film kinetics and the resulting interpretations of tear film rupture and coverage cycles, or periods of atmospheric exposure between pre-SCL and precorneal flickers [ 21 , 22 ] can help to collect objective data on changes to lacrimal dynamics or the ocular surface, with or without previous symptoms [ 23 , 24 ]. Additionally, independently evaluating factors, such as evaporation rates, tear film volume, and meibomian expression, or using validated questionnaires, such as the Contact Lens Dry Eye Questionnaire (CLDEQ8) or Standard Patient Evaluation of Eye Dryness (SPEED) [ 25 , 26 ] can be used as a method to anticipate clinical management or to modify factors, such as adjustment, materials, mode of use, care systems, or even the discontinuation of SCL use [ 27 , 28 ]. The significance of the paper lies in evaluating the effectiveness of Lehfilcon A silicone hydrogel contact lenses, which have bacterial and lipid resistance technology, in reducing subjective symptoms of dry eye disease and improving non-invasive tear film analysis results.…”

An Optimal Analysis to the Prominent Iris Detail-Based Discrete Wavelet Transform to Reduce Fake Rejection Ratio

“…Significantly, most contact lenses may impede the iris recognition systems from imaging the natural iris texture. Therefore, Iris' commercial recognition systems must offer clear detection innovations when using contact lenses [5][6][7].…”