Publicação
Impact of soft contact lenses for digital devices on visual performance, tear film, accommodative response and dehydration in young adult subjects: a pilot study
| Resumo: | The purpose of this study was to investigate the effect of soft contact lenses (CLs) claimed to be beneficial for use of digital devices on visual performance, accommodative response as well as tear film and dehydration in young adult subjects. Seven young-adult myopes with mean age of 25.71±3.40 years wore two designs of CLs for digital devices - Biofinity Energys (Comfilcon A) and Bausch + Lomb ULTRA (Samfilcon A) - for a week each in a randomised single-masked cross-over study. Visual performance was measured with high and low-contrast visual acuity at distance (ETDRS visual charts), optical quality (aberrometry), light disturbance (LD) measured with a Light Disturbance Analyzer, tear film (dynamic cornal topography), accommodative response (badal optometer coupled with an openfield autorrefractometer), quality of vision (Quality of Vision questionnaire) and comfort were evaluted at lens dispensing visit (LDV) and after one week of wear. CLs dehydration was evaluated in vitro and ex vivo using a gravimetric method. A single vision contact lens was used as control device. The results showed that no significant differences in the level of visual performance achieved with both types of CLs for digital devices in comparison with Control lens (p > 0.05, Friedman test). Concerning optical quality, significant differences were found for coefficients Astig Obli, Horizontal COMA, 4th and 6th order spherical aberration with CLs tested (all p≤0.03). The irregularity parameter of LD showed significant differences in monocular condition between CLs tested (p=0.028). Tear Film Surface Quality (TFSQ) Index and TFSQ Area increase significantly with CLs tested compared to baseline (p<0.05, Friedman test). Auto Tear Break-Up Time (BUT) was significant higher at Baseline than CLs tested (p<0.05, Friedman test). Accommodative response, comfort and QoV did not change significantly (p>0.05, Friedman test). CLs dehydration rates (vitro and ex vivo) did not change significantly (p>0.05, Unpaired T-test and ANOVA). The findings of this study suggest that soft CLs for digital devices offer similar visual quality outcomes and clinical performance compared to the Control lens. Importantly, change in tear film stability, comfort score and QoV were not statistically significant, but were clinically significant. Thesepreliminary outcomes should be confirmed with a larger sample size. |
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| Autores principais: | Mazuze, Avelino Nelson Filipe |
| Assunto: | Accommodative response and tear film instability Contact lenses Digital devices Visual performance Desempenho visual Dispositivos digitais Lentes de contato Resposta acomodativa e instabilidade do filme lacrimal Ciências Naturais::Ciências Físicas |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The purpose of this study was to investigate the effect of soft contact lenses (CLs) claimed to be beneficial for use of digital devices on visual performance, accommodative response as well as tear film and dehydration in young adult subjects. Seven young-adult myopes with mean age of 25.71±3.40 years wore two designs of CLs for digital devices - Biofinity Energys (Comfilcon A) and Bausch + Lomb ULTRA (Samfilcon A) - for a week each in a randomised single-masked cross-over study. Visual performance was measured with high and low-contrast visual acuity at distance (ETDRS visual charts), optical quality (aberrometry), light disturbance (LD) measured with a Light Disturbance Analyzer, tear film (dynamic cornal topography), accommodative response (badal optometer coupled with an openfield autorrefractometer), quality of vision (Quality of Vision questionnaire) and comfort were evaluted at lens dispensing visit (LDV) and after one week of wear. CLs dehydration was evaluated in vitro and ex vivo using a gravimetric method. A single vision contact lens was used as control device. The results showed that no significant differences in the level of visual performance achieved with both types of CLs for digital devices in comparison with Control lens (p > 0.05, Friedman test). Concerning optical quality, significant differences were found for coefficients Astig Obli, Horizontal COMA, 4th and 6th order spherical aberration with CLs tested (all p≤0.03). The irregularity parameter of LD showed significant differences in monocular condition between CLs tested (p=0.028). Tear Film Surface Quality (TFSQ) Index and TFSQ Area increase significantly with CLs tested compared to baseline (p<0.05, Friedman test). Auto Tear Break-Up Time (BUT) was significant higher at Baseline than CLs tested (p<0.05, Friedman test). Accommodative response, comfort and QoV did not change significantly (p>0.05, Friedman test). CLs dehydration rates (vitro and ex vivo) did not change significantly (p>0.05, Unpaired T-test and ANOVA). The findings of this study suggest that soft CLs for digital devices offer similar visual quality outcomes and clinical performance compared to the Control lens. Importantly, change in tear film stability, comfort score and QoV were not statistically significant, but were clinically significant. Thesepreliminary outcomes should be confirmed with a larger sample size. |
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