First, you need to confirm whether contacts can result in yellow eyes. Do not wear contacts for several days, if your eyes healed, leave or replace the contacts. If they are still yellowish, there might be other reasons.
1. Inadequate diet. Have too much foods riching in carotene or other colored medicines, your eyes could be yellowish. And they can get back after controlling diet.
2. Rubbing eyes. Too much dust in your eyes or working over an extended period of time by computer, both can lead to rubbing eyes. Try not to rub them, your eyes will get better.
3. Jaundice. Jaundice is a symptom of liver diseases. For this reason, the best way is to get examined. And treat it in time.