I would suggest that she buy all what she need before your trip to avoid disappointment. Does she have a favorite brand for her contact lenses? You could buy them in Cambodia and Laos but the variety would be not as varied as what you would expect.
But if you have no choice then it is better to buy those in Cambodia rather than in Laos because of better choices of brand or grade.
The optician on the ground floor of the Talat Sao mall in Vientiane has a selection of brands of daily contact lenses. They are more expensive than the various internet lens suppliers but useful if you get stuck.
Yes, the optician near the Talat Sao Bus station is probably the best around. Agree with Lao Info. By the way, this is not dearer than buying them in a western country.
As information, as noted, you will find the widest selection of both lenses and the associated solutions here in Thailand, but on the whole they will be priced either just as much or slightly more than you'd pay "at home", depending largely on what specific lens you wear.
In part the pricing issue stems from the fact that unlike many US health-care policies, most Thai health-care policies don't have either an optical or contact lens "rider" that provides for an annual lens supply or rebates against their purchase price.. So they're bought here at full-price.
I agree with the others, to avoid possible disappointment or simply lack or availability issues, I'd bring an ample supply to cover the entire duration of the trip..
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