Pupillometry Dynamic Measures in Patients Without Ocular or Neurological Disease (PCT)

Fondation Ophtalmologique Adolphe de Rothschild

Status: Completed

Conditions: Optic Neuritis

Treatments: Device: pupillary light reflex

Study type: Observational

Funder types: NETWORK

Identifiers

NCT02894281

CLL_2016_2

Details and patient eligibility

About

Retrobulbar optic neuritis (NORB) is the damage to the optic nerve caused by inflammation. It causes a rapidly progressive and painful visual loss, often among young subjects. Diagnosis confirmation is important to start proper treatment, because a NORB is often the first symptom of multiple sclerosis. This diagnosis, based on a set of arguments, is difficult to define by a non-expert ophthalmologist.

The pupillary light reflex is a way to test the visual afferent pathways. If it is subject to a large inter-individual variability, the dynamics of the pupillary light reflex and its latency are more reproducible. An easy way to study the dynamics of the pupillary light reflex is to study the pupillary cycle time (PCT). In the case of NORB, elongation of the conduction in the visual afferent pathways related to demyelination plate increases the latency of the pupillary light reflex and decreases the frequency of the PCT.

Our hypothesis is that PCT dynamics measures would be a reliable indicator and easy to evaluate some pathologies affecting the integrity of the nerve. The validation of a decrease in the frequency of the PCT in NORB, compared to the frequency observed in subjects ophthalmological or neurological disease, could help developing methods to study the conduction of the visual pathways with portable devices used during the standard ophthalmologic consultation and quickly orientate patients to specialized centers.

Enrollment: 22 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• age > 18 years old
• Subject without known ocular or neurological disease
• Ametropia inferior to 3 diopters for spherical correction and inferior to 1.50 diopter for astigmatism correction
• Matched for age and sex with one of the 22 subjects of the patients' unilateral NORB database

Exclusion criteria

• history of disease affecting pupillary motility
• anisocoria
• patient under legal protection
• pregnant or breast feeding patient
• patient's refusal to participate in the study
• no medical insurance coverage

Trial design

22 participants in 2 patient groups

Measure of pupillary light reflex

Description:

patients without optic neuritis

Treatment:

Device: pupillary light reflex

patients with optic neuritis

Description:

clinical database of 22 patients (measurement of pupillary light reflex already performed for the same purpose, in a former study)

Treatment:

Device: pupillary light reflex