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[log in to unmask] wrote: <<My mother who has had Parkinsons for 10 yrs. complains of vision problems and is concerned how much of it might have to do with the PD. She did have cataract surgery in one eye, but there seems doubt as to whether it held its success. She mentions "not being able to see well--says that things she looks at with her left eye (the one with the cataract operation) seem diagonally distorted and that her right eye is blurry. Of course the right eye still has a cataract carrying lens in it. Anyway she also reports that these conditions seem related to the PD. They change with her condition and she feels muscular "pulling" around her eyes..." She is getting ready to start all over with an eye exam but wonders if others have had problems seeing; I think she wants to feel prepared for discussing it with an eye doctor also. Thanks in advance if anyone has any insights here!>> you want insights about vision. is there a pun here? there are many indications that peripheral vision is affected. including the very rapid (unscious-maybe extremely rapidly processed information handling compared to normal neural signalling speeds); this may be relevant to the frezing in dorways and other phenomena that are affected by blue lens over the peripheral vision area. The dopamine may over-sensitize these motion detector neural circuits. There may also be some potential that tremor of the head or even motion of the eyes can trigger the eye motion detectors when reading - if the hand holding the book is moving - the brain gets a signal that distorts the normal eyes ability to present the normal optical-nerve data in the formats expected. the eye does not see - it registers shapes, angles, colors, various other characteristics of light reaching the retinal parts. these signals and characteristics are interpreted via many neural networks into our visualization of letters, words, symbols picture parts et cetera in complicated ways. Often the PD patient is not found to have optician-measurable defects. the muscles of the eyes are also affected. the normal eye to eye synchronization of movements across lines and other processes in the way the eye gets binocular information to both sides of the brain and adds these to perceive depth is not normal with PD on one side of the brain than the other. I doubt that I have helped much except to say that seeing is very much more than a camera operation. The opthalmologist can perhaps help if experienced and specializing that includes dealing with numerous PD patients. The eye exam results should be checked a week later before committing to new glasses. there are some indications that the vision changes rather randomly and rapidly. My left eye functions well only over a 18 or 20 inch distance to several hundred yards. My right eye is "good" from 5" sometimes to 20" or so -- thereforre, when I read I am usually only using the right eye. this may be a lucky chance that makes it easier for me than the many who wear a patch - or prism in one lens. Eye strain does occur - double vision - tetral , etc. I see many crescents when looking at the crescent moon without glasses. Then, there is the whole imaging and hallucinating effects on dreaming and such things which occur - I will stop with this here. -- ron 1936, dz PD 1984 Ridgecrest, California Ronald F. Vetter <[log in to unmask]> http://www.ridgecrest.ca.us/~rfvetter