This study checks if a balance exercise called *incremental vestibulo-ocular reflex adaptation* (IVA) is safe and helpful for adults with vision problems, with or without inner-ear balance issues. The vestibular system is part of the inner ear that helps with balance. The study wants to see if IVA causes only mild, temporary symptoms and if it helps with eye movement, balance, and walking.

Participants will rate their symptoms, undergo tests for balance reflexes (like VOR gain, which measures how well your eyes move with your head), and complete balance and walking assessments. Two groups will be compared: those with only vision issues and those with both vision and vestibular problems.

• The study includes two visits, separated by a break.
• Participants are adults aged 18 to 60.
• Participants will undergo a non-invasive, 15-minute IVA training session.

Eligibility requires specific vision or balance impairments. People with changing vestibular conditions or serious neurological, psychiatric, or substance issues are excluded. The research aims to improve balance and eye movement therapies for those with vision and vestibular challenges.