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

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

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.

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