What is the purpose of a needle holder in medical procedures?

A needle holder is an essential instrument used in medical procedures, particularly in suturing, where precise control is required. Its primary function is to securely grip the needle while the practitioner stitches the edges of a wound or incision together. By providing a stable grasp, the needle holder allows for better maneuverability and accuracy, reducing the risk of needle slipping during the suturing process.

In contrast, the other options refer to different medical instruments or procedures. Measuring visual acuity typically involves tools like an eye chart and not a needle holder. Scraping cells from the cervix is done using a speculum or a cervical brush during a Pap smear, rather than any device associated with needles. Examining interior body parts usually requires scopes or specialized imaging equipment, which are not related to suturing. Understanding the specific purpose of each instrument is crucial for effective and safe medical practice.