Jean-Marie Hanssens

Université de Montréal | UdeM · School of Optometry

Purpose: Many high-income countries like Canada are faced with unmet needs regarding the availability of access to eye care, especially in rural, remote, or northern areas. Teleoptometry has the potential to improve access to primary eye care and help prevent, detect, diagnose and treat uncorrected refractive error and sight-threatening eye disease...

OBJECTIVE: To evaluate the effect of the orthokeratology (OK) lens design, used in the Montreal Experience cohort, on corneal treatment zone characteristics and their relationship to the pupil. METHODS: This retrospective study follows previously published work and refers to the analysis of 4 different OK lenses. Tangential topography maps were obt...

Introduction Proper access to primary eye care is essential in addressing vision impairment, and tele-eye care examinations are a promising solution that could facilitate this access in many rural or remote areas. Even though remote eye exams are becoming increasingly frequent, comprehensive tele-eye care exams are still limited by the lack of publ...

Significance: This study investigates how a new smartphone scanning technology compares with established online and storefront vendors in providing remote measurement and adjustment of prescription eyeglasses. Purpose: To evaluate a new technology for ordering prescription eyeglasses online. Methods: Thirty participants with 2.00 to 2.75 diopt...

Refraction is an important part of a comprehensive eye examination, and when performed remotely through information and communication technology or when its results are transmitted for remote analysis, this procedure is called tele-refraction. Uncorrected refractive errors are the main reason for consultation in primary eye care, and an increasing...

Background: Among technologies targeting mobile eye care, EyeNetra is a smartphone-based subjective refraction system. This study compared the results from this system with those of professional subjective refraction. Participant visual comfort and preference of results were also measured. Methods: Thirty-six optometry-naïve participants (n = 36...

Significance: Pharmaceutical companies recommend discarding ophthalmic drugs 28 days after opening. This study shows that diagnostic eye drops have a low risk of contamination over a 7-month period in a controlled clinical setup. The diagnostic efficiency seems to be preserved over this period. Purpose: The aim of this study was to evaluate the...

Visual stimulation alone is sufficient to produce visually induced postural reactivity (VIPR). While some studies have shown that VIPR increases with the velocity of a moving visual stimulus, others have shown that it decreases with the temporal frequency of an oscillating visual stimulus. These results seem contradictory given that these two varia...

The role of visual input on postural balance remains relatively unknown. As the population ages, it becomes important to determine possible effects of visual distortion induced from ophthalmic lenses used to correct presbyopia on the capacity to interact with the environment. One of the consequences of progressive ophthalmic lenses used for presbyo...

Purpose: Older observers tend to be more visually dependent for posture control. It has been suggested that cognitive load can produce postural instability. Very little is known on the relationship between the cognitive tasks and postural control when posture is strongly influenced by dynamic visual inputs and whether the resulting postural reactiv...

Purpose: The purpose of this study was to determine whether aging could have a significant impact on postural control in presence of dynamic optical distortions. Methods: We used a full immersive virtual environment to simulate dynamic distortions normally produced by ophthalmic lens corrections for myopes and hyperopes. Two young and senior groups...

Background. In most cases, presbyopic vision is corrected using progressive lenses. In spite of the geometric advanced of such products, some progressive lens wearers have difficulty adapting to them because of the distortions perceived in the bottom of the lenses. The purpose of the present study was to evaluate the influence of the visual distort...

Purpose: During upright stance condition, vision is known to have an important role in maintaining posture. Central vision is essential for details and motion perception while peripheral vision is primarily specialized for motion perception. However, little is known about their respective roles for postural control in optical flow conditions. In th...