- Dizziness may feel variable yet persistent, often accompanied by eye fatigue and blurred vision during visual tasks.
- Ocular-related dizziness, vertigo, and imbalance is typically associated with disturbances in head-eye coordination and eye-tracking movements.
Ocular-Related Vertigo, Dizziness, and Imbalance
Dizziness refers to a sensation of imbalance. Our sense of balance relies on both external sensory input (visual and auditory) and internal sensory input (muscle and tendon feedback, as well as the vestibular system). In everyday life, these systems work together seamlessly and at lightning speed through unconscious processes.
When dizziness occurs, different parts of the balance system may send conflicting signals to the central nervous system, creating a sensory mismatch. This leads to dizziness, where the visual perception of the environment may appear unclear, disturbed, or unstable—especially in situations involving various eye functions.
The eyes are a significant source of sensory information. Therefore, dizziness can stem from functional disorders of the eyes. The most common causes of dizziness related to eye function are disorders of head-eye coordination.
Functions of the Eyes
The primary role of the eyes is to keep stationary or moving objects within the field of vision, allowing them to be seen clearly. The five key functions of the eyes include:
- Focusing the gaze during head movements (head-eye coordination, or vestibular-ocular reflex)
- Stabilising images during object movement (optokinetic reflex)
- Adjusting focus for objects moving closer or farther away
- Tracking an object while the head remains still (slow tracking movements)
- Rapidly shifting gaze from one object to another (saccadic movements)
In daily life, nearly all activities require a combination of these functions. As a result, ocular dizziness and vertigo can manifest in a wide range of situations. For practical purposes, eye functions can be categorised into focusing and movement functions.
Symptoms of Ocular Vertigo
- A constant but fluctuating sensation of dizziness, especially during head and eye movements
- A sense of blurriness or unreality that changes throughout the day
- Symptoms worsened by physical or mental strain
- Blurred vision
- General eye fatigue
- Perception of the eyes jumping, wandering, or bouncing while walking
- Motion sickness or nausea
- Difficulty maintaining focus in a single direction for extended periods
- Uncertainty during movement, particularly when the head is in motion
- Headaches, neck, or shoulder pain or tension
Causes of Prolonged Symptoms
Prolonged symptoms are typically caused by a combination of factors rather than a single issue:
- Neck-related dizziness or recurring inner ear disturbances
- Congenital conditions affecting vision and balance, such as strabismus or motion sensitivity
- Impaired vision or degenerative eye diseases
- Diagnosed strabismus
- Extended periods of computer use
- Psychological factors such as anxiety, depression, or excessive mental strain
- Lifestyle factors, including poor diet, lack of exercise, or inadequate sleep
- Musculoskeletal disorders of the neck affecting movement and function
- Neurological disorders that impair movement control, such as Parkinson’s disease
Treatment and Rehabilitation
Treatment and neurological rehabilitation must be tailored to the individual. It is difficult to offer general advice on ocular dizziness and vertigo, as treatment must address the unique combination of contributing factors for each person. The most common causes of ocular vertigo involve head-eye coordination, which can often be improved through targeted gaze stabilisation exercises. These exercises are also a core component of vestibular rehabilitation.
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