Parkinson’s disease does not directly affect the eyes, but some symptoms may result in visual impairment.
- After a few years, it’s common for it to take longer to switch to dark vision. Dark vision is intact, but the transition takes longer, and it can feel like you’re getting more easily blurred in traffic at dusk and when it starts to rain and get dark.
- There are also reports that, for example, late at night, the colors may change and blur on one eye, which is also likely a consequence of the slower light/dark transition in some people.
- It is quite common that, after many years of illness, a double ending may occur later in the evening. In most cases, it is a “tiredness” phenomenon and the double ending is usually absent in the morning afterwards, but not always.
- After DBS surgery, after a few years, ” eyelid apraxia ” (difficulty opening the eyelids) may occur and it can become very troublesome. It is similar to the ” freezing ” of the eyelids that can occur but for the eyelids.
- Visual hallucinations can occur, but are dependent on the disease and medication, and not the eyes. It is usually the visual memory that is extracted from the visual memory and “fills” voids e.g. a person sitting in a (empty) chair. Sound and image are stored in different areas of the brain, and can never be simultaneous.
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