How did the Casey case modify Roe?

The Casey case, formally known as Planned Parenthood v. Casey (1992), modified Roe v. Wade by reaffirming the constitutional right to have an abortion while allowing states to impose certain regulations. The Supreme Court upheld the central holding of Roe but introduced the "undue burden" standard, stating that states could not place significant obstacles in the path of women seeking abortions before fetal viability. This allowed for more state-level restrictions, such as waiting periods and informed consent laws, as long as they did not create an undue burden on a woman's right to choose.