Purpose: To evaluate the short-term visual performance, subjective acceptance, tear film stability, and ocular physiological response after 1 h of wear of a monthly replacement soft contact lens for myopia control with different central optical zone diameters and hydration modalities.Methods: Thirty myopic young adults (21 ± 1 years) were fitted monocularly with three centre-distance multifocal designs: 3.9 mm optical zone with bulk hydration, 3.9 mm with blister hydration, and 3.6 mm with bulk hydration. A no-contact lens condition served as baseline. High-contrast visual acuity (CDVA) and contrast sensitivity function (CSF) under photopic and mesopic conditions, tear film parameters (tear meniscus heigh, non-invasive tear break-up time), and Likert scales (visual quality, comfort, satisfaction) were assessed using a repeated-measures design.Results: Photopic CDVA did not differ significantly across conditions (≤ −0.06 logMAR; p = 0.29), while the 3.9 mm design with blister hydration showed a small reduction in mesopic CDVA (0.02 logMAR) compared with the baseline condition (−0.04 logMAR, p = 0.01). CSF was generally worse with contact lens wear compared to baseline, particularly for the 3.6 mm design, which showed lower sensitivity at low and high spatial frequencies, more evident under mesopic conditions (p ≤ 0.01). Subjective visual quality was also lower for this design (4.5/6 vs 5.2/6, p = 0.003), whereas comfort and satisfaction were high and similar across lenses (≥ 5.7/6 and ≥ 4.0/5, respectively; p ≥ 0.10). Non-invasive tear break-up time decreased with lens wear (p ≤ 0.03), with no differences between designs or hydration modalities (≥ 10.68 s). No clinically relevant adverse events were observed.Conclusions: The evaluated contact lenses showed good short-term performance and tolerance. A smaller central optical zone was associated with modest reductions in contrast sensitivity and perceived visual quality, without clear advantages in other outcomes. Hydration modality did not influence performance.
Purpose: To evaluate the mobile application's effectiveness in enhancing contact lens (CL) wearers' knowledge and improving their lens care practice. Methods: This pretest-posttest study involved neophyte CL wearers in Tehran, Iran, who were randomly assigned to intervention and control groups, matched by sex and lens type. Participants' demographics, knowledge, and practice were assessed using validated questionnaires. The intervention group used a user-centered mobile application ("My Lens") with educational content, interactive features, and reminders for two months. Data were analyzed using chi-square, independent sample t-test, and paired t-test. Results: Sixty neophyte CL wearers participated, with no significant differences in demographic or lens-use characteristics between groups. In the intervention group, mean knowledge scores increased from (27.7 f 5.8) at pre-test to (43.5 f 1.4) at post-test, indicating a statistically significant improvement with a very large effect size (d = 3.77). In the control group, scores also increased from (27.7 f 2.7) to (33.6 f 2.5), with a smaller but significant effect (d = 2.28). Post-intervention practice scores were higher in the intervention group (93.6 f 3.0) compared to the control group (77.8 f 3.6), with a very large effect size (d = 4.19). Overall, the mobile application effectively improved both knowledge and practice compared to routine training. Conclusion: The user-centered mobile application significantly improved both knowledge and practice among CL wearers, confirming the effectiveness of mobile-based educational (m-health) tools. Providing structured, accessible, and user-friendly education, such applications may prevent complications and promote safer CL use.
