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NCT Number: NCT07499180

A Study on Body Posture and Eye Movements During Screen Usage on Adults Aged 18 to 65 Wearing Various Types of Eyeglasses

The goal of this clinical study is to evaluate how adults aged 18 to 65 move their bodies and eyes when they use screens, with various eyeglasses. The main questions it aims to answer are :

* How the behaviour between young and presbyopes is different while performing visual tasks on digital devices ? * How the behaviour while performing visual tasks changes according to different types of eyeglasses ? Participants will be asked to take part in an eye exam and do simple visual tasks on digital devices.

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Key information

Conditions

Healthy Adults

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Distance refractive error (equivalent sphere) between -3D and +3D
  • Astigmatism inferior or equal to 1D
  • Anisometropia inferior or equal to 1.5D
  • Addition (for presbyopes) between 0.75D and 2.75D
  • Minimum corrected visual acuity : 8/10
  • Stable binocular vision

Exclusion criteria

  • Employee of Essilor, Luxottica, GrandVision and their subsidiaries
  • Aphakia, pseudophakia or ocular surgery
  • Reported systemic pathology that affects vision
  • Medical treatment or taking medications that affect vision
  • Severe ocular pathology declared, involving a loss of visual field as in glaucoma, a loss of acuity
  • Reported neurological deficit, including a history of seizure or sensorimotor coordination disorders, vestibular or cerebellar pathology
  • Binocular vision problems such as amblyopia, strabismus, or double vision
  • Vertebral or cervical troubles
  • Difficulty to move, vertigo, ocular migraine

Treatment and study plan

eye exam

Device

Participants will get an eye exam

Body posture and eye movements behaviour of digital device users

Other

Measurement of the body posture and eye movements behaviour of digital device users while performing simple visual tasks with various types of lenses

Primary outcomes

  1. Quantification of Gaze Lowering using an eye-tracker device

    Time frame: From enrollment to 3 months after enrollment

    Quantitative Assessment of eye movements in degree with an eye-tracker during visual tasks

Secondary outcomes

  1. Quantification of Head and body inclination with a motion capture system

    Time frame: From enrollment to 3 months after enrollment

    Quantitative evaluation of postural behavior in degree with a motion capture system while performing visual tasks

  2. Digital device usage distance using motion capture system

    Time frame: From enrollment to 3 months after enrollment

    Quantitative assessment of digital devices' usage distance during visual tasks

  3. Correlation between refraction profile and visual tasks' postural behavior

    Time frame: From enrollment to 3 months after enrollment

    Statistical analysis of the association between participant's refraction characteristics and their visual tasks' behavioral patterns (Quantification of Gaze Lowering, Quantification of head and body inclination, Digital device usage distance)

  4. Correlation between binocular vision profile and visual tasks' postural behavior

    Time frame: From enrollment to 3 months after enrollment

    Statistical analysis of the association between participant's binocular vision characteristics and their visual tasks' behavioral patterns (Quantification of Gaze Lowering, Quantification of head and body inclination, Digital device usage distance)

  5. Correlation between accommodation profile and visual tasks' postural behavior

    Time frame: From enrollment to 3 months after enrollment

    Statistical analysis of the association between participant's accommodation characteristics and their visual tasks' behavioral patterns (Quantification of Gaze Lowering, Quantification of head and body inclination, Digital device usage distance)

  6. Correlation between head-eye ratio profile and visual tasks' postural behavior

    Time frame: From enrollment to 3 months after enrollment

    Statistical analysis of the association between the head-eye ratio (relative contribution of the head and the eye in a composite movement involving both of them) and the visual tasks' behavioral patterns (Quantification of Gaze Lowering, Quantification of head and body inclination, Digital device usage distance)

Study contacts

Contact information is provided by the study sponsor or research team.

Chloé Moger

CONTACT

[email protected]

+33(0)155964827

Valérie Parmentier

CONTACT

[email protected]

+33(0)155964912

Sponsors and collaborators

Lead sponsor

Essilor International

Industry

Registry information

Official study title

Etude Des Comportements Posturaux et Oculomoteurs Durant l'Utilisation d'Outils Digitaux

Acronym: POEM

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Mar 30, 2026
Registry last updated
Apr 13, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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