If you are living with homonymous hemianopia, everyday activities that once felt automatic can suddenly require much more attention. You may bump into objects, miss part of a sentence while reading, overlook food on one side of your plate, or fail to notice someone approaching from the affected side.
The frustrating part is that your eyes may still seem to work normally. That is because homonymous hemianopia is usually not caused by damage to the eyes themselves. It results from a problem in the brain or the visual pathways behind the optic chiasm. In adults, stroke is the most common cause.[1]
Although no treatment restores lost vision for everyone, that does not mean improvement stops here. Some vision may return naturally, and rehabilitation can help you read, move around, and manage daily life with greater confidence.
If the visual-field loss is new or sudden, do not wait to see if it improves. Sudden loss of part of your visual field can be a warning sign of stroke and requires urgent medical assessment.
What Is Homonymous Hemianopia?
Homonymous hemianopia means losing the same side of the visual field in both eyes.
For example, in right homonymous hemianopia, the right half of your visual field is missing or markedly reduced in both eyes. In left homonymous hemianopia, the missing field is on the left.
This happens because visual information from both eyes travels through the brain along pathways that include the optic tracts, lateral geniculate nuclei, optic radiations, and visual cortex. Damage behind the optic chiasm—the point where some optic nerve fibers cross—can produce a homonymous visual-field defect.
The location is usually on the side of the brain opposite the missing visual field:
- Right homonymous hemianopia: usually associated with a lesion in the left retrochiasmal visual pathway.
- Left homonymous hemianopia: usually associated with a lesion in the right retrochiasmal visual pathway.
This contralateral relationship is why the phrase contralateral homonymous hemianopia is sometimes used: the visual-field loss is opposite the affected cerebral hemisphere.
However, the precise pattern of a visual-field defect cannot always identify the exact location or cause of a brain lesion, so formal examination and appropriate brain imaging remain important.
What Is Macular Sparing?
Some people retain a small area of central vision even though most of one side of their visual field is lost. This pattern is known as homonymous hemianopia with macular sparing.
It is often associated with lesions affecting the occipital visual cortex. Central fixation may remain relatively preserved, but reading can still be difficult because efficient reading depends on more than central vision alone. Macular sparing can suggest lesion location, but it cannot determine the cause or replace appropriate brain imaging.[2]
What Does Homonymous Hemianopia Feel Like?
Homonymous hemianopia does not necessarily make vision blurry. Central visual acuity can remain relatively good even when a large part of the visual field is missing.
You may notice problems such as:
- Bumping into walls, furniture, or doorframes on one side
- Missing objects or people on the affected side
- Difficulty navigating crowded environments
- Losing your place when reading
- Missing words at the beginning or end of a line
- Taking longer to search for objects
- Feeling uncertain on stairs, sidewalks, or unfamiliar routes
- Needing deliberate eye or head movements to check the missing side
Reading can be especially frustrating because normal reading depends on quick eye movements called saccades. These movements help your eyes find the next word and move between lines.
With right-sided field loss in a language read from left to right, previewing upcoming words may become difficult. With left-sided loss, locating the beginning of the next line can be particularly challenging.
Reading problems can be persistent, but they are not always fixed. A meta-analysis of nine studies found a small improvement in reading performance after rehabilitation, including with reading-specific training.[3]
What Causes Homonymous Hemianopia?
Stroke
Stroke is the most common cause of homonymous hemianopia in adults. Both ischemic strokes, caused by interrupted blood flow, and hemorrhagic strokes, caused by bleeding, can damage the visual pathways.
An occipital stroke is a classic cause because the occipital lobes at the back of the brain contain the primary visual cortex.
Homonymous hemianopia can also occur with larger middle cerebral artery strokes when the optic radiations passing through the temporal or parietal lobes are affected.
Other Causes
Other possible causes include:
- Traumatic brain injury
- Brain tumors
- Neurosurgery or treatment-related brain injury
- Multiple sclerosis and other demyelinating diseases
- Inflammatory or infectious neurological conditions
- Other neurological disorders affecting the posterior visual pathways
Temporary homonymous visual-field loss can occur during migraine aura, seizures, or a transient ischemic attack (TIA). Because stroke can cause a similar sudden deficit, a new episode should not be assumed to be migraine without medical assessment.[4]
How Is Homonymous Hemianopia Diagnosed?
A healthcare professional may initially check your visual fields using a confrontation visual-field test, in which you look straight ahead while identifying fingers or targets presented in different parts of your vision.
Formal visual-field testing, often with automated perimetry, creates a more detailed map of what you can and cannot see. It can detect smaller or incomplete field defects that a simple bedside confrontation test may miss.
Depending on your situation, assessment may also include:
- Visual acuity testing
- Pupil and eye-movement examination
- Eye-health examination
- Neurological examination
- Assessment for visual neglect
- CT or MRI brain imaging
The 2025 European Stroke Organisation guideline supports early vision screening after stroke. Although evidence on the optimal timing is limited, expert consensus favors vision screening within about 3–4 days after stroke onset when feasible, using a validated tool or specialist visual assessment.[5]
Homonymous Hemianopia vs. Visual Neglect
Homonymous hemianopia and visual neglect, also called spatial inattention, can appear similar but involve different neurological problems.
In homonymous hemianopia, the main problem is a visual-field defect: visual information from one side is disrupted because of damage to the visual pathway.
By contrast, visual neglect is mainly an attention disorder. A person may fail to attend adequately to one side of the environment even though parts of the visual pathway can still transmit information.
A homonymous visual-field defect usually respects the vertical midline, whereas neglect often behaves more like a gradient of reduced attention across space. The two conditions can also occur together after stroke, which is why careful visual and neurological assessment matters.[6]
Can Homonymous Hemianopia Improve?
Yes. Improvement is possible, but the amount of recovery varies widely and cannot be predicted precisely for an individual.
A 2025 study found that more than 77% of a selected group with reliable repeat visual-field tests showed some improvement within the first six months after an occipital stroke. Improvement was greater in partial than complete field loss. However, only 73 of 532 initially identified patients had enough reliable repeat testing, so 77% should not be interpreted as the recovery rate for everyone with homonymous hemianopia.[7]
Visual Recovery Is Not the Same as Functional Recovery
Your formal visual-field test can remain abnormal while your ability to function improves.
With rehabilitation and practice, you may learn to:
- Detect objects on the affected side more efficiently
- Navigate rooms and public spaces more confidently
- Organize scanning movements
- Read with fewer interruptions
- Modify your home or workspace
- Develop routines that reduce avoidable hazards
Progress does not always mean that the missing visual field returns. For many people, meaningful recovery also means becoming more efficient, confident, and independent with the vision they still have.
Treatment and Rehabilitation for Homonymous Hemianopia
Treatment begins with identifying and managing the underlying neurological cause. Rehabilitation then focuses primarily on helping you adapt to the visual-field loss.
Visual Scanning Training
Visual scanning training teaches deliberate eye movements toward the affected side so that you search areas your visual field no longer captures automatically.
The European Stroke Organisation supports compensatory visual scanning and visual-search strategies after stroke, although it also notes that the evidence behind these approaches is still limited.
A 2025 multicenter trial involving 161 stroke survivors adds an important qualification. People improved with both visual scanning training and comparison eye-movement exercises, but scanning training was not clearly better.[8]
In practical terms, scanning strategies remain reasonable tools for compensation, but they should not be promoted as a proven way to regenerate damaged visual pathways.
Occupational Therapy and Vision Rehabilitation
Occupational therapy for homonymous hemianopia can turn visual compensation strategies into practical everyday skills.
Your rehabilitation program might address environmental scanning, object-finding, reading and computer use, home safety, stairs and doorways, returning to work or hobbies, and adapting your workspace.
Care may involve an occupational therapist, neurologist or stroke specialist, neuro-ophthalmologist, ophthalmologist, optometrist, orthoptist, or vision rehabilitation professional. The right combination depends on the cause of the field loss and your rehabilitation needs.
Prism Glasses
Peripheral prism glasses can shift images from part of the missing hemifield into the seeing field, which may improve obstacle awareness for some people.
A clinical trial found that peripheral prisms improved self-reported mobility for some people with complete homonymous hemianopia without visual neglect compared with sham prisms. They are not suitable for everyone, however, and adaptation can take time.[9]
Prisms are a compensation tool, not a cure. They do not restore damaged brain tissue.
Practical Ways to Manage Homonymous Hemianopia
Rehabilitation should be individualized, but a few practical changes can make everyday tasks safer and less frustrating.
You may benefit from intentionally checking the affected side before walking through a doorway, stepping off a curb, or reaching for an object. Keeping frequently used belongings in predictable locations can reduce unnecessary searching.
When reading, a ruler, line guide, digital highlighting tool, or other visual anchor may help you keep your place. Increasing spacing or text size can also help some readers.
Choose strategies with your rehabilitation professional based on your specific visual-field pattern rather than relying on generic online exercises.
Can You Drive With Homonymous Hemianopia?
Homonymous hemianopia can significantly affect hazard detection because driving requires awareness across a wide visual field.[10]
Legal visual-field standards differ between U.S. states and between countries. Feeling comfortable behind the wheel does not by itself mean that you meet licensing requirements or that driving is medically appropriate.
Before returning to driving, discuss your visual-field loss with your treating clinician and check the requirements of your state, country, or licensing authority. A specialist driving assessment may also be appropriate in some jurisdictions.
When Is Homonymous Hemianopia an Emergency?
Sudden new visual-field loss should be treated as a medical emergency, especially when the cause has not already been established.
Call emergency services immediately if sudden vision loss occurs with symptoms such as:
- New weakness or numbness of the face, arm, or leg
- Difficulty speaking or understanding speech
- Sudden loss of balance or coordination
- Confusion
- A sudden severe headache
Frequently Asked Questions
It can be permanent, but not always. Recovery varies by cause and severity, and rehabilitation can still improve day-to-day function when the field defect persists.
No. Standard prescription glasses correct optical focusing problems but cannot replace a visual field lost because of brain injury. Special prism systems may help selected people compensate for part of the missing field.
In the United States, ICD-10-CM category H53.46 covers homonymous bilateral field defects. Current codes include H53.461 for the right side, H53.462 for the left side, and H53.469 when the side is unspecified.[11]
No established treatment reliably restores a lost visual field for everyone. Rehabilitation mainly aims to improve compensation, safety, function, and independence.
The Bottom Line
Homonymous hemianopia can affect reading, mobility, work, and everyday safety. Some visual recovery may occur, particularly after stroke, while rehabilitation can improve scanning, navigation, and daily function even when the field defect persists.
The best path is to identify and treat the cause, accurately map the visual-field loss, and build a rehabilitation plan around your daily needs. Even when vision does not fully return, greater safety, confidence, and independence remain realistic goals.
Medical References
Update History
Supporting evidence reviewed for accuracy and currency.
Medically reviewed by Dr. Jubair Islam.
Originally written by Dr. Rahul Kushwaha.
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