| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2697285 | Contact Lens and Anterior Eye | 2015 | 6 Pages |
•Three brands of daily disposable silicone hydrogels showed similar average fit.•Lag reduced, but push-up recovery speed increased from 8 to 12 h.•Lens fit was not correlated with comfort, ocular physiology or lens wettability.•The fit of lenses on an individual varied between brands unpredictably.•Consequently, substitution of lens brand without rechecking fit is Q3 unadvisable.
PurposeTo quantify the end-of-day silicone-hydrogel daily disposable contact lens fit and its influence of on ocular comfort, physiology and lens wettability.MethodsThirty-nine subjects (22.1 ± 3.5 years) were randomised to wear each of 3 silicone-hydrogel daily-disposable contact lenses (narafilcon A, delefilcon A and filcon II 3), bilaterally, for one week. Lens fit was assessed objectively using a digital video slit-lamp at 8, 12 and 16 h after lens insertion. Hyperaemia, non-invasive tear break-up time, tear meniscus height and comfort were also evaluated at these timepoints, while corneal and conjunctival staining were assessed on lens removal.ResultsLens fit assessments were not different between brands (P > 0.05), with the exception of the movement at blink where narafilcon A was more mobile. Overall, lag reduced but push-up speed increased from 8 to 12 h (P < 0.05), but remained stable from 12 to 16 h (P > 0.05). Movement-on-blink was unaffected by wear-time (F = 0.403, P = 0.670). A more mobile lens fit with one brand did not indicate that person would have a more mobile fit with another brand (r = −0.06 to 0.63). Lens fit was not correlated with comfort, ocular physiology or lens wettability (P > 0.01).ConclusionsAmong the lenses tested, objective lens fit changed between 8 h and 12 h of lens wear. The weak correlation in individual lens fit between brands indicates that fit is dependent on more than ocular shape. Consequently, substitution of a different lens brand with similar parameters will not necessarily provide comparable lens fit.
