http://www.algorithmicartisan.com/gostones/goStones.html
http://lifein19x19.com/forum/viewtopic.php?f=20&t=6517

Or, try just with different arts and craft color papers -- cut out circles and see if she has the same problems
if the circle colors are red and blue, for example ?

What stones and board are you currently using ? (which are giving her the problems)
Could you post a few photos of your set ?

Does she experience similar problems with...
- checkers, or othello (with black-and-white pieces) ?
- black and white chess pieces in a normal chess game ?
- your same Go set, but playing pente instead of Go ?
- all board sizes -- 9x9, 13x13, 19x19 -- or only the big 19x19 ? (for many novices, the 19x19 board can be overwhelming at first)

Could you experiment with different colors... say, with the plastic bottle caps of 2-liter (or smaller sizes) soft drink bottles?
Or, try just with different arts and craft color papers -- cut out circles and see if she has the same problems
if the circle colors are red and blue, for example ?

Another option to consider would be something like these wooden stones:

http://www.uncommongames.com/product/p- ... -wood.aspx

I have no experience with this issue, so I can't be sure it will solve anything, but perhaps the softer colour and the lower contrast w.r.t. the board will help. At least the price of $17.95 makes the investment a lot smaller than many other options.

I don't have any direct experience, but you might also try going bigger, using 1-2 inch stones.

Store bought (stones are 1-3/8)
Make your own (any color you want to paint)

That's a good idea. If you wanted something a bit more solid, you could try things like different color buttons from a craft store. EDIT: Or Ebay! (http://www.ebay.com/itm/Buttons-Round-A ... 2a284b0e60)

And I'm sure you've seen this, but you can get darker boards (http://www.ymimports.com/p-1752-beechwo ... REbRKXrNHM), and boards made out of particle board that are less intensely yellow (https://www.yutopian.com/yutop/cat?prod ... category=T).

A bunch of buttons and a particle wood board would certainly be a cheaper option to try out.

Poker chips might also work - did anyone recommend that?

Anyway, I don't mean to pry, but you suggested that your friend has a visual impairment in the thread title, but don't actually mention what that might be. If you know that she has a visual impairment, her optometrist or ophthalmologist is the person to ask about what combinations of colors and shapes won't set off this reaction. If you are merely speculating that she has an impairment, a trip to the optometrist might save you a lot of heartache later on.

Unfortunately, no optometrists in the area will diagnose this problem, or even consult regarding it. She has myopia, the same as I, but this is no explanation for this adverse reaction. Her last optometrist told her that "no one has this problem; if you do, it's in your head." Unfortunately, living in an area that requires no board certification to become a practicing optometrist means a tremendous amount of quackery. There's only one board-certified I know of, and they practice two hours away, and there is a $700 down payment on the appointment, just to make it. Supposedly he's known for working with people like Whoopie Goldberg and other celebrities. ... It's just not an option.

If you are not aware already, you may want to look into an ophthalmologist instead, if you are able. They are medical doctors who specialize in conditions of the eye and vision, as opposed to optometrists, who are doctors of optometry, not MDs, and work primarily on vision correction and more common eye conditions.

I will pass this on to her and see if that's the route she wants to take. It impacts no other aspect of her life, and and neither of us have insurance, so this visit could cost us hundreds, if not thousands.

and there is a $700 down payment on the appointment, just to make it.

This might be a good time to check out whether you can qualify for Medicaid. If this is an early sign of glaucoma, you want her to be treated appropriately before she loses her vision. If it's a neurological problem, you don't want her to suddenly develop tunnel vision and panic attacks on the highway in the middle of the night.

This is not an eye problem, IMHO. It sounds like a neurological problem. If money were no issue, I'd recommend seeing a neuro-opthamologist.

Due to some recent health problems of my own, I've been forced to become an amateur student of neuro-opthamology.

@Csobod:If you don't mind, I'd like to ask some questions.

1) How old is she?
2) Does she have any other neurological symptoms? ( Numbness? Tingling? Headaches? Ringing ears? Flashes of light in the corner of her eyes upon sudden head movement? etc )
3) Is she a vegetarian?
4) Has she at least seen an optometrist? ( They are relatively cheap and common. You can even find them in Sears and Costco )
5) What does she see when she looks at an Amsler grid?

This is an amsler grid. Ask her cover one eye, and to stare at the dot in the middle. Then switch eyes. What does she see?
Any grey areas? Blank areas? Wiggley lines? Broken lines?

It never ceases to amaze me the kinds of things we can learn on a Go forum. What is up with the $700 appointment ??? (Which currency, btw? )

Just out of curiosity, approx. where are you located (maybe within 500 miles is good enough? ) ?

Maybe you can try playing with dimes vs pennies