About this trial
The goal of this observational study is to learn whether different types of eyeglasses prescription and different types of lenses change how close teenagers hold objects when looking at them up close. The study includes adolescents who are non-myopic and adolescents who are myopic and wear either single-vision lenses or lenses slowing down myopia progression.
The main questions it aims to answer are:
Do teenagers in these three groups use different average working distances (eye-to-object distance) during everyday tasks?
Does wearing Essilor® Stellest® lenses change working distance compared with wearing single-vision lenses?
Researchers will compare the three groups to see if their working distances differ.
Participants will:
Complete an initial optometric eye examination.
Come for a second visit where they perform everyday activities while wearing a motion-capture system that measures how they move and how far they hold objects.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
Volunteer adolescent, fluent in French, able to follow protocol and read and write
Aged between 12 and 17 years and 6 months
Adolescent with no history, according to the participant and/or their legal representatives, of any pathology, deficit, or disorder that could interfere with visual or cognitive functions.
If the subject wears glasses, they must have an ophthalmic prescription dated within the last year, certifying that a consultation was carried out during the previous year
Disqualifiers
Age < 12 years
Age > 17 years and 6 months
Pregnant or breastfeeding women (Article L1121-5)
Persons (legal representatives or subjects) deprived of their liberty by a judicial or administrative decision and persons hospitalized without consent pursuant to Articles L. 3212-1 and L. 3213-1 who are not covered by the provisions of Article L. 1121-8 and persons admitted to a health or social care facility for purposes other than research
Trial design
Parallel
Treatments tested in this trial
Ophtalmic measurements
DeviceParticipants will undergo a standard ophthalmic examination during the initial visit. All procedures are non-invasive, non-ionising, and conducted using devices routinely employed in clinical ophthalmic practice.
Visuo-postual measurements
BehavioralThe behavioral part of the study consists of a set of tasks designed to assess eye movements and visual behavior in both controlled and ecological conditions. Participants perform everyday activities while eye movements and body motion are recorded using an eye tracker and motion capture systems.
Treatment groups
Trial outcomes
Primary outcomes
Working distance using motion capture system
Quantitative assessment of working distance in meters during near vision tasks using a motion capture system
Secondary outcomes
Gaze behavior during near vision tasks accessed with an eye-tracking system
Assessment of eye movements (spatial coordinates) during near vision tasks
Posture, eye-head coordination during near-vision tasks (with motion capture system)
Quantitative evaluation of postural behavior (spatial coordinates of body parts) while performing near vision tasks.
Correlation coefficient (R2) between optometric profile and near-vision behavior
Statistical analysis of the association between participants' optometric characteristics and their near vision behavioral patterns.
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