Objective: Understand relationship between vision and comfort in contact lens (CL) wear.
Methods: Retrospective analysis of five trials using similar protocols with nonpresbyopic (NP) myopes or presbyopic participants (Px) wearing various simultaneous-image designs (SM) and single-vision (SV) CL (NP only). Questionnaires (vision satisfaction, vision clarity: distance/intermediate/near, comfort) on 1 to 10 scale were administered 1 week after fitting. Vision/comfort relationship was analyzed using linear mixed model and presented as regression coefficient with 95% confidence intervals (CIs).
Results: Vision ratings correlated with comfort ratings, although this varied depending on type of vision rating and Px category. Vision satisfaction influenced comfort for the NP-SV group (slope: 0.8; 95% CI: 0.58-1.01, P≤0.001), but was significantly lower in the presbyopic group (slope: 0.38; 95% CI: 0.33-0.42; P≤0.001). Controlling for lens material obtained similar results. In the reverse relationship, comfort had a significant impact on vision satisfaction, although again at varying levels for each Px group. NP-SV demonstrated the weakest relationship (slope: 0.47; 95% CI: 0.35-0.59, P≤0.001) in comparison to NP-SM and P-SM groups.
Conclusion: Vision and comfort in CL wear are inter-related. Consideration of Px characteristics, visual stimulus, and CL comfort needs to be accounted for when assessing overall CL experience.
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