Incremental Vestibulo-ocular Reflex Adaptation as a Novel Treatment for Dizziness in People With Multiple Sclerosis

Inclusion Criteria:

* Neurologist-confirmed diagnosis of primary progressive or relapsing and remitting MS per The 2017 Revision of the McDonald Criteria and the Magnetic Resonance Imaging in MS, or a healthy volunteer without a diagnosis of multiple sclerosis or any related neurological conditions
* Fluent in speaking and understanding English
* Subjects with multiple sclerosis have self-reported vestibular symptoms of dizziness, imbalance, and/or a history of at least two falls in the prior 12 months

Exclusion Criteria:

* Clinically isolated syndrome or radiologically isolated syndrome.
* Worsening MS symptoms during the prior 60 days
* Immunotherapy change in the prior 60 days
* Self-reported cognitive impairment that limits independence with basic and instrumental activities of daily living
* Systolic blood pressure \> 180 mmHg and/or diastolic blood pressure \> 90 mmHg at rest
* Static visual acuity with correction of worse than 1.0 logMAR
* Manifest ocular misalignment ≥ 5 diopters (e.g., tropia, lazy eye, strabismus}
* Convergence insufficiency
* Intra-nuclear ophthalmoplegia
* Vestibular Migraine
* Major orthopedic conditions that limit cervical spine range of motion or that alter walking
* Self-reported current or potential for pregnancy during enrollment
* Ongoing participation in vestibular rehabilitation for dizziness