If you don't wash the bit of paint thinner in your eyes, your eyes will get damage seriously. You should wash it out with clean water carefully. Then you could use the clean cloth to dry it. You could also use the warm compress to make your eyes get moisture and comfortable. This will be so effective and workable.
Take it easy. Although paint thinner is mixed up with several chemical substances, you are still fine if there is just a little of paint thinner which entered your eyes by chance. Now the first thing to do is flush your eyes with warm and clean water without any facial cleanser and soap. Then use a dry cloth to clean up your eyes gently and slow to get rid of the rest paint thinner around eyes. Next drop some counter eye drops to remit pain, redness and irritation in eyes. Stay for a few minutes, if your condition is still bad, go to see a doctor as soon as possible.