Participants were young, healthy volunteers. Not Applicable
Conditions
Interventions
The study concerns young healthy volunteers, which were asked to wear blue light blocking lenses for the period of four weeks. Their functioning under the condition of blocking the blue light was comp
Sponsors
Narodowe Centrum Nauki
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. Age: 20-35 years old 2. Handedness: right 3. Regular sleep-wake cycle and sleep time between 6 and 9 hours per night 4. Experience in contact lens wearing (especially monthly disposable contact lenses without necessity to remove them for night) 5. Low level of daytime sleepiness, good sleep quality and non-extreme chronotype (on the basis of questionnaires).
Exclusion criteria
Exclusion criteria: 1. Any MR exclusion criteria (metal parts in the body, pacemaker, etc.) 2. Pregnancy 3. Chronic diseases (eg diabetes), neurological and psychiatric conditions. 4. Other than myopia eye conditions.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Measured at baseline and 6-weeks: 1. Brain activations involved in cognitive task - that is performance and neuronal activity for two cognitive tasks measured using fMRI 2. Brain activations involved in emotional task - neuronal activity measured using fMRI during presentation of emotionally positive and negative stimuli 3. Performance in cognitive tasks directed to measure alertness, working memory and visuo-spatial memory. | — |
Secondary
| Measure | Time frame |
|---|---|
| Measured at baseline and 6-weeks: 1. Sleep quality measurement - assessed with subjective sleep quality questionnaires (PSQI - Pittsburgh Sleep Quality Index and ESS - Epworth Sleepiness Scale ) in different experimental conditions; 2. Circadian rhythm measurement - assessed with diurnal salivary cortisol pattern (morning and evening levels) and DLMO (dim light melatonin onset, five samples taken each session); 3. Sleep-wake cycle assessed with the use of actigraphs; 4. Emotional functioning - assessed with mood questionnaires (positive and negative affectivity and hedonic tone). Questionnaires used: PANAS - Positive and Negative Affect Schedule and SHAPS - Snaith-Hamilton Pleasure Scale. | — |
Countries
Poland
Outcome results
None listed