Pupil Dynamics and Color Vision for the Detection of Eye Diseases

Study Overview
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Brief Summary
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The development of new oculometry techniques allows fine and dynamic measurements of pupillary diameter and use in routine clinical practice. The preliminary results obtained with innovative devices on healthy sjuets make it possible to envisage a clinical study on a population of patients suffering from retinal pathologies. This is a proof of concept study, which, if the expected results are confirmed, will make it possible to consider a study on a larger population, as well as the industrial development of a commercial device.

Detailed Description
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This is a single-head study that will take place at the National Ophthalmology Hospital Center (CHNO) and the Vision Institute (Streetlab) and the total duration of the study is 24 months . It is planned to include 60 participants divided into different groups: 15 healthy subjects, called controls. 15 patients with retinitis pigmentosa. 15 patients with Leber's hereditary optic neuropathy. 15 patients with Stargardt's disease. Patients will be pre-selected on files at the CHNO clinical investigation center based on the visual assessment carried out on the day of their arrival, the doctor may suggest that they participate in the study if the inclusion criteria are respected. The control subjects will be recruited thanks to the database of the Vision Institute at Streetlab.

Official Title
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New Methods of Dynamic Pupillometrics in Subjects With Visual and Color Vision Pathologies for the Detection, Functional Diagnosis and Follow-up of These Pathologies

Conditions
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Retinitis Pigmentosa, Leber's Hereditary Optic Neuropathy, Stargardt Disease

Intervention / Treatment
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* Behavioral: Dynamic pupillometry sessions


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: - Patients with an understanding of the French language to ensure a perfect understanding of the instructions during evaluations and documents relating to their involvement in the study. Visually impaired volunteers: Patients must have one of three conditions: Retinitis Pigmentosa, Stargardt disease, Leber optic neuropathy. Healthy volunteers: Visual acuity of both corrected eyes (glasses) should be higher or equal 8/10th and a normal visual field. Patients should not wear contact lenses (which may interfere with the recording of the pupil and eye movements) Exclusion Criteria: Pregnant or lactating women will not be able to participate in this research. Participants should not be unable to personally consent. Subjects should not participate in another clinical trial that may interfere with this research. Inability to personally consent. Subjects should not present with degenerative diseases or any other disease that could interfere with the evaluations planned during this study. The subject follows a drug treatment which can cause visual disturbances, changes in pupillary kinetics or cognitive disturbances. Secondary exclusion criteria (at the end of the inclusion visit): Visually impaired subjects and controls for which calibration is not feasible. Patients and control subjects having difficulty maintaining visual fixation. Patients and subjects wearing corrective lenses making it impossible to record oculomotor activity with an infrared camera oculometer.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Dynamic pupillometry sessions<br>It is planned to include 60 participants divided into different groups: 15 healthy subjects, called controls. 15 patients with retinitis pigmentosa. 15 patients with Leber's hereditary optic neuropathy. 15 patients with Stargardt's disease. | Behavioral: Dynamic pupillometry sessions<br>* The evaluation protocol will include the following steps: Installation of the subject, adaptation of the chin rest for the best comfort of the participant Calibration of the oculometer consisting of ocular fixation of 9 fixation points distributed on the stimulation screen Final validation of the eligibility of the subject in the study according to the success or not of the calibration.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Dynamic pupillometry sessions pupillary reflex measurement | Measurement of the right eye / left eye and binocular monocular pupillary reflex: pupillary response measured for 5 seconds with 3 levels of screen luminance, each stimulation will be separated from the next by a delay of 5 seconds | Week 1 | 
| RAPD measurement | Alternate stimulation of the right and left eye: 10 repetitions, each corresponding to the stimulation of one eye for one second. | Week 1 | 
| Endogenous pupillary oscillation measurement | Pupil oscillation frequency, for each eye and in binocular: during this test the participants observe the stimulation screen (central fixation point) for 45 seconds during which the lumnance of the screen is calculated to be proportional to the size of the pupil in real time. | Week 1 | 
| Measurement of pupillary activity by frequency marking | This test consists of the simultaneous presentation of 5 areas of the screen, each of which is luminance modulated at a specific frequency. | Week 1 | 
| Pupillary measurement of color vision | In this test, 2 background colors alternate at low frequency over time. The physical luminance of one color is fixed while the other is adaptively changed during a test to reduce pupillary response. | Week 1 |