Glaucoma
- Stephanie Soto
- Aug 6
- 3 min read
Glaucoma is an eye condition that damages the optic nerve. It tends to affect people as they age. Did you know there is an association with Parkinson's? Let's dive in.
What Is Glaucoma?
Glaucoma is a group of eye diseases that damage the optic nerve, the structure responsible for carrying visual information from the eye to the brain. In many cases, this damage is linked to increased pressure inside the eye.
The eye naturally produces a clear fluid that nourishes its internal structures. Under normal circumstances, this fluid drains at the same rate it is produced, keeping eye pressure stable. When drainage slows or becomes blocked, pressure can rise and gradually injure the optic nerve.
One challenge with glaucoma is that it often develops without noticeable symptoms. Early vision loss usually affects peripheral (side) vision, making routine eye examinations essential for detecting the condition before significant damage occurs.
Understanding the Two Main Types
The most common form of glaucoma is open-angle glaucoma. It develops gradually over time and is often managed successfully with prescription eye drops that reduce eye pressure.
A much less common but more urgent condition is closed-angle glaucoma. In this type, the eye's drainage pathway becomes suddenly blocked, causing a rapid increase in eye pressure. Because vision can be threatened within hours, closed-angle glaucoma requires immediate medical treatment and often laser or surgical intervention.
Parkinson's Medications and Glaucoma
Many people diagnosed with both Parkinson's disease and glaucoma wonder whether levodopa-based medications, such as carbidopa/levodopa, are safe.
For individuals with open-angle glaucoma, these medications are generally considered appropriate when used under the guidance of their neurologist and ophthalmologist.
However, closed-angle glaucoma is different. Because this form already involves a narrowed or blocked drainage angle, medications that affect the eye's pupil or fluid balance may increase eye pressure further. For this reason, levodopa is generally avoided in people with untreated closed-angle glaucoma.
If you have Parkinson's disease and glaucoma, it's important to know which type of glaucoma you have and discuss your treatment plan with both your eye specialist and neurologist.
Why Regular Eye Exams Matter
People with Parkinson's disease can experience a wide range of vision-related issues, many of which are treatable. Annual comprehensive eye examinations can help identify glaucoma, cataracts, macular degeneration, and other conditions before they significantly affect vision.
Parkinson's disease itself may also contribute to visual symptoms, including:
Double vision or difficulty focusing on objects up close
Dry eyes caused by reduced blinking
Problems with contrast, color perception, depth perception, or motion detection
Visual hallucinations
Difficulties judging distances or navigating through spaces
Because these symptoms may result from changes in the brain as well as the eyes, some individuals benefit from evaluation by a neuro-ophthalmologist, a specialist who focuses on vision problems related to the nervous system.
What Research Is Showing
Recent studies suggest that eye disorders are common among people living with Parkinson's disease. Researchers have also found that glaucoma may occur more frequently in this population than in people without Parkinson's.
Scientists are increasingly interested in the retina as a potential source of information about brain health. Since the retina is an extension of the central nervous system and can be examined using advanced imaging techniques, researchers are investigating whether changes in retinal nerve fibers could one day help identify or monitor neurological diseases, including Parkinson's.
Key Takeaways
Glaucoma can cause permanent vision loss if left untreated, but early detection greatly improves outcomes.
Open-angle glaucoma is the most common form and is often managed effectively with eye drops.
Closed-angle glaucoma is a medical emergency that requires prompt treatment.
Most people with open-angle glaucoma can safely use levodopa medications under medical supervision.
People with closed-angle glaucoma should discuss Parkinson's medications carefully with their healthcare providers.
Routine eye examinations are an important part of Parkinson's care, as many eye conditions can be treated when identified early.
Ongoing research continues to explore how the retina may provide valuable insights into brain health and neurological disease.
Maintaining regular communication between your neurologist and eye care provider helps ensure that both your Parkinson's symptoms and your vision receive the attention they deserve.