You can register online by visiting the Iowa Donor Registry website. When you apply for your Iowa driver's license at your local Iowa Department of Transportation office, you will be asked if you would like to register as a donor. If you check "yes" on your Iowa driver's license application form, you've given legal consent to donate your eye, organ and tissue after your death.
It is important to tell your next of kin your donation wishes. Next-of-kin cooperation with a medical/social history interview is required before transplantation, so it is helpful if your family and friends know how you feel about donation.