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

NCT07499180 | Recruiting

• 2 other identifiers: WS104822025-A02528-41
• Study Type: interventional
• Target: 69
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Healthy Adults

Outcome Measures

Primary Outcomes (1)

• Quantification of Gaze Lowering using an eye-tracker device

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

  From enrollment to 3 months after enrollment

Secondary Outcomes (6)

• Quantification of Head and body inclination with a motion capture system

  From enrollment to 3 months after enrollment

• Digital device usage distance using motion capture system

  From enrollment to 3 months after enrollment

• Correlation between refraction profile and visual tasks' postural behavior

  From enrollment to 3 months after enrollment

• Correlation between binocular vision profile and visual tasks' postural behavior

  From enrollment to 3 months after enrollment

• Correlation between accommodation profile and visual tasks' postural behavior

  From enrollment to 3 months after enrollment

Study Arms (3)

Young Adults

EXPERIMENTAL

Young adults will test single vision lenses

Device: Eye exam; Other: Body posture and eye movements behaviour of digital device users

Presbyopes between 51 and 65 wearing progressive lenses

EXPERIMENTAL

Presbyopes between 51 and 65 will test single vision and progressive lenses

Device: Eye exam; Other: Body posture and eye movements behaviour of digital device users

Presbyopes between 43 and 50 not wearing progressive lenses

EXPERIMENTAL

Presbyopes between 43 and 50 will test single vision and progressive lenses

Device: Eye exam; Other: Body posture and eye movements behaviour of digital device users

Interventions

Eye exam DEVICE

Participants will get an eye exam

Presbyopes between 43 and 50 not wearing progressive lenses; Presbyopes between 51 and 65 wearing progressive lenses; Young Adults

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

Presbyopes between 43 and 50 not wearing progressive lenses; Presbyopes between 51 and 65 wearing progressive lenses; Young Adults

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• 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

You may not qualify if:

• 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

Sponsors & Collaborators

• Essilor International: lead

Study Sites (1)

Essilor International

Paris, 75012, France

RECRUITING

MeSH Terms

Interventions

Posture

Intervention Hierarchy (Ancestors)

Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena

Study Officials

• Chloé Moger

  Essilor International

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Chloé Moger

CONTACT

+33(0)155964827; mogerc@essilor.fr

Valérie Parmentier

CONTACT

+33(0)155964912; PARMENTV@ESSILOR.fr

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Model Details: 3 groups will follow different interventions. * Young adults (18-35) : will test single vision lenses * Presbyopes not used to wear progressive lenses (43-50) : will test single vision and progressive lenses * Presbyopes used to wear progressive lenses (51-65) : will test single vision and progressive lenses

Study Record Dates

• First Submitted: March 16, 2026
• First Posted: March 30, 2026
• Study Start: April 7, 2026
• Primary Completion (Estimated): October 1, 2026
• Study Completion (Estimated): October 1, 2026
• Last Updated: April 13, 2026

Record last verified: 2026-04

Data Sharing

• IPD Sharing: Will not share

Locations

FR (1)