View clinical trials related to Visual Stress.
Filter by:The goal of this double-masked randomised controlled trial (RCT) is to assess the symptoms of visual stress (VS), reading speed and changes in behaviour / academic performance, when wearing optimal Precision Tinted Lenses compared to sub-optimal Precision Tinted Lenses (PTLs). In participants ages 9-18 years. Participants, parents and researchers will be masked until the end of the trial. Participants will be randomised into two groups A and B. 50% of participants will receive the optimal PTL where the other 50% will receive the sub-optimal PTL. Participants will be asked to wear the PTLs for one month. Followed by one month of no wear. After which, participants will receive the second pair of PTLs to wear for one month. Participants will need to fill out a symptom dairy everyday from the day of recruitment until the end of the trial. A symptom questionnaire will need to be filled out as baseline at recruitment and the end of each month of wear. An academic behaviour survey will also need to be filled out at baseline by parents and teachers at recruitment and the end of each month of wear. At the end of the three months unmasking will occur and participants will be given the PTL that demonstrate the greatest reduction in VS.
This is a double-masked randomized controlled trial which aims to assess the effects of precision tinted spectacle lenses on visual stress symptoms within an undergraduate University student population.
Background and objectives: There is a general agreement that some types of urban environment could be the source of psychological stress as opposed to natural-relaxing environment. A number of aesthetical researches found out that the main cause for stress appearance can be explained by the complexity and order of the environment. There are also some indications that the stressing influence of the open environment can be measured by evaluating eye movements, in particular saccadic movements. The objective of this study is to characterize eye movements - mainly saccades -while presenting visual material of different complexity and order and to evaluate the possible relationship between eye movements and parameters of psychological and physiological stress. Methods: The research is based on systematic gradual experiments on healthy volunteers, who will be tested while viewing series of abstract figures and pictures of natural and urban areas with different level of complexity and order. Each figure or picture will be showed to subjects for 7 seconds. During the whole experimental session the investigators will measure: 1. Saccadic and other eye movements using the magnetic scleral search coil technique. The magnetic scleral search coil technique is the most sensitive and accurate technique used in modern ocular motor research for measuring horizontal, vertical and torsional eye movements. The coils are easy to apply and well tolerated over a wearing period of up to 45 minutes per recording session. 2. Heart rate pulse will be measured using a commercial pulse-meter. 3. Aesthetical evaluation: Following each figure or picture 7 seconds presentation; subjects will rate it in a scale from 1 (very relaxing) to 10 (very stressful). Possible relationship between saccadic eye movements, heart rate and aesthetical rate will be analyzed using WIN 11 SPSS and MATLAB in statistically accepted ways. Population: A total of about 60 healthy subjects aged 18-60 years old will be recruited for the study from students, faculty and staff of Tel Aviv University and of Meir Medical Center. Criteria for inclusion: Healthy subject with normal vision Criteria for exclusion: Eye disease such as corneal or scleral abrasion or disease, glaucoma, refractive errors greater than 2 diopters and concurrent medication with CNS-active agents.