Purpose Clinicians play a key role in prescribing contact lenses that best suited for fitting which materials had an impact on ocular surface parameters. The present study aimed to evaluate the impact on symptomatology, tear film dynamics and ocular surface integrity of a silicone-hydrogel (Somofilcon-A) and a hydrogel (Omafilcon-A) lens before and after wearing for one week in contact lens neophyte participants. Methods A Somofilcon-A and Omafilcon-A were randomly fitted to one or other the eye on an initial group of 28 participants. Subjects were scheduled for three sessions: basal session previous fitting, second session after 4-wear hours, and final session after 7-wear days for up to 10 h. In each session, CLDEQ-8, tear meniscus height and hyperemia with and without lenses, as well as lipid layer thickness and corneal/conjunctival staining without lenses were assessed. Values were compared between lenses and sessions. Results In intrasession comparison, there were no differences in any parameter between materials on any session with or without lenses (all p≥0.176), except on the conjunctival staining where values obtained during Somofilcon-A wear (all p ≤ 0.006). In intersession analysis, CLDEQ-8 score, tear meniscus height and lipid layer thickness showed a statistical difference during both materials wear (all p ≤ 0.009), while conjunctival hyperemia does not (p = 0.237); corneal staining showed differences during Omafilcon-A wear (p = 0.037), contrary to conjunctival staining which showed differences only during Somofilcon-A wear (p < 0.001). Conclusion Contact lenses wear had an impact on ocular parameters that have some specific influences of the material on which lenses were manufactured.
Purpose: To compare the values of central corneal thickness (CCT), the anterior chamber depth (ACD) and the axial length (AL) on measurements performed with and without contact lenses (CL) in healthy subjects. ACD was measured with two different devices (Visionix 120+ and EchoScan US-800) and the values were also compared between them. Material and methods: 20 volunteer participants (6 men and 14 women, 24.8 ± 2.73 years) were recruited. In a single visit, participants underwent autorefraction, biometry, topography and pachymetry with the naked eye (without CL). Then, biometry and pachymetry were repeated twice wearing two different CL (Somofilcon A and Nesofilcon A) of -3.00D lens power fitted in random order. Data were compared using t-tests for related samples. Results: CCT values wearing CL were significantly higher than those obtained with the naked eye (Paired t-test; both p ≤ 0.001). On the other hand, no significant differences were found between the ACD or AL values with the naked eye versus any of the CL studied (Paired t-test, all p ≥ 0.111). The ACD values comparing Visionix120+ to EchoScan US-800 measurements were significantly different with both the naked eye and with any CL (Paired t-test; all p ≤ 0.001). Conclusion: CCT measurements cannot be performed while wearing CL. In contrast, ACD and AL measurements were not affected by the use of any CL. In addition, it was observed that ACD results from both devices are not interchangeable neither when measured with the naked eye nor using any CL.
Purpose: Anaglyphs, Vectograms and Cheiroscopes are visual therapy materials based on red/green, polarized, or black/white targes that used similar but slightly different images for each eye to train fusion and vergence skills. This study aimed to analyse the differences in the results obtained on those devices on participants with low, normal, or high AC/A ratios. Material and methods: three groups of volunteer participants were recruited based on their recent clinical history among patients attending the Optometry Clinic of the centre: 15 participants with low AC/A, 15 participants with normal AC/A and 15 participants with High AC/A ratios. None of them was under any type of medication, have an ocular or systemic disease, or were performing any kind of visual training plan that could affect the study. In two sessions one week apart, following the manufacturer’s instructions, the participants performed in a random order three visual therapy device-based training: one red/green Fixed Demand Anaglyph [FDA], one Variable Demand Polarized Vectogram [VDPV], and one based on the Wheatstone W [WW]. Participants were instructed to indicate the maximum value base-out (BO) where both image fusion and clarity was lost. Results between both sessions were compared with an analysis of differences. Results: There was found higher BO vergences results with the three devices regarding the second to the first session in the Low and Normal AC/A groups (Wilcoxon test, all p ≤ 0.013), but none in the High AC/A group (Wilcoxon test, all p ≥ 0.162). Conclusion: There is an enhancement of BO vergences in Low and normal AC/A participants but not in high AC/A participants by performing visual training with Anaglyphs, Vectograms and Cheiroscopes devices.
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