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How Does Parkinson’s Affect Vision?

How Does Parkinson’s Affect Vision?

We often read new articles about Parkinson’s disease (PD) that identify one of many non-motor complications of the disease. Upon first hearing of a Parkinson’s diagnosis you think about tremors, rigidity and difficulties with gait. Recently more information is available about non-motor issues like changes in mood and behavior, sensory problems like the loss of sense of smell, and difficulty hearing. Now more is recognized about vision complications.

Vision issues in Parkinson’s can range from dry eyes and blurry vision to difficulty controlling eye movements, the inability to open eyelids, and increasing likelihood of hallucinations. PD can cause eye or eyelid problems, as can side effects of medications used to treat the disease. Unrelated ocular conditions and progressing age can also lead to eye and eyelid issues.1

Sudden visual changes should be immediately reported to your doctor because, as with other PD symptoms, most related symptoms take time to develop. An illness, change or cessation in medication or other circumstances that come on quickly, can often be resolved just as quickly by seeking medical care.

Why does Parkinson’s affect the eyes?

Parkinson’s is characterized by a loss of dopamine producing cells in the substantia nigra portion of the brain. The reduction of dopamine can affect the visual cortex. So Parkinson’s can impair mobility of the eyes just like the limbs. There are several kinds of visual disturbances that may be experienced by people with Parkinson’s. Many who experience changes in vision or eye mechanics seek out a consultation from a neuro-opthalmologist, someone who specializes in visual problems associated with neurological disease.2

Eye pathology

Changes in the structure of the eye related to PD are limited primarily to effects on the retina, which, like the substantia nigra is similarly affected by dopamine depletion. Color vision, particularly the ability to discern between shades, can be reduced due to the loss of dopaminergic receptors in the retina.3

The use of prescription eyeglasses can address some vision symptoms. Different kinds of corrective lenses can be used for reading and distance vision. Some who experience difficulty focusing their eyes can be fitted for glasses with prisms. Just like holding a glass up to the light can show you rainbow colors by bending the light, prisms added to lenses help to adjust the focal point on the retina. This can help reduce fatigue and double vision.2

Types of eye movements

There are three kinds of eye movements that can change with PD:

  • Saccadic rapid eye movements direct us to gaze at a specific object or to read lines of print.
  • Pursuit eye movements allow us to follow an object as it moves.
  • Vergence eye movements allow us to move our eyes in different directions2

Changes to these eye movements due to Parkinson’s can also result in different kinds of visual difficulties. The inability to control eye movements can lead to involuntary blinking, double vision and other motor issues that can affect visual acuity.

Dry eyes can be treated with drops or ointments, warm wet compresses, but are not generally cured. The blink reflex can be impacted by PD. This manifests as either a slowing of the reflex, appearing as inappropriate staring, dry or burning eyes; and by reduced vision. Blepaharospasm and apraxia are two common eyelid motion issues. Blephararospasms are eyelid spasms that cannot be controlled, cause eyelids to squeeze, and can be relieved with Botox injections. Apraxia is a condition that makes it difficult to open eyes. There are specialized lid crutches and cosmetic tape that can be applied to hold the eyelids open.2

Medication effects

PD medications can affect your eyes as well as controlling motor symptoms associated with the condition. A complete history of the drugs, supplements and vitamins you taken is important in evaluating visual symptoms in people with PD. Specific medications, their dosages and the individual medication cycle may cause visual impairment. Therefore, improvement may also be made due to adjustments in medications.3

Visual hallucinations are generally associated with the psychological factors of PD. Generally attributable to cognitive defects, disease progression over time, and daytime sleepiness; it can also be exacerbated by medications.


People with PD may experience a variety of visual, motor and behavioral symptoms during the course of their disease and no two people are likely to experience them the same way. Visual changes can be mild, experienced as dry eyes and blurry vision, decreased ability to discern color, and slower pupil reactivity. Or they can be more significant affecting ocular movements, slower processing and an inability to control to operation of eye movements. Visual deterioration can impact quality of life by increasing risk of falls and a potential for developing visual hallucinations.

Fortunately, visual problems in PD can generally be treated. A visit to the doctor and ophthalmologist or neuro-opthalmologist can provide clinical insight. An examination can determine if there are physiological defects of the eye, or if medication side effects are the cause of visual disturbances. Changes in medication and prescription glasses or prisms may help resolve some or all visual changes, leading to more comfortable quality of life.

Engage with the community by asking a question, telling your story, or participating in a forum.

  1. Dolhun, R. Vision and Parkinson's Disease Published October 27, 2018 Michael J. Fox Foundation for Parkinson's Research. Accessed online February 20, 2018.
  2. Parkinson's effect on Vision. American Parkinson Disease Association website. Accessed online February 19, 2018.
  3. Armstrong RA. Visual Symptoms in Parkinson's Disease. Parkinsons Dis. 2011; 2011: 908306. Published May 25 2011 Parkinson's Disease. 2011;2011:908306. doi:10.4061/2011/908306. Accessed online February18, 2018.


  • sharonmdiamond
    14 hours ago

    Dear Team, OMG, I’ve finally found an answer!! Ten years ago I was diagnosed with PD and considering that length of time I’m reasonably well. I roll with the punches. In my experience, this disease pretty much doesn’t leave anything alone. Four years ago I started to have double vision in my left eye. When driving I had to close one eye to make a left turn. When I next saw my regular eye doc he was concerned and wrote a note to my PC who sent me to a specialist at the University of Rochester Medical Center. She put me through the ringer and after much ado I finally ended up with prisms in my eyeglasses.
    Long & short of it, not one of my docs has ever answered my question….is this part of PD….with a “yes”. In my heart I knew they were all wrong. PD has tampered with many of my bodily functions, why not my vision?
    Thanks to you I now have confirmation. You haven’t any idea how happy I am to have read your article and I am sincerely grateful.

  • Chris H. moderator
    12 hours ago

    This is really great to hear, @sharonmdiamond. I’m so glad that this article was able to provide an answer for you. Hopefully there will continue to be more awareness on this topic. Thanks for sharing. – Chris, Team

  • Chrystalina
    11 months ago

    I have been forwarded your article by one of my research patients. There are a few scientific publications on eye movement abnormalities and PD and one of the areas we are carrying out research on at present. Saccades are one of the most affected type of eye movements and we have found out that it can be detected even at the very early stages prior to initiating medication.

    Best wishes,

    Professor Chrystalina Antoniades
    Associate Professor of Neuroscience,
    John Radcliffe Hospital, University of Oxford

  • Chris H. moderator
    11 months ago

    Hi Chrystalina – That’s really great to hear that a research patient shared this article with you! Glad to have you join the community. This sounds like fascinating research! Thanks for taking the time to share more about yourself. – Chris, Team

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