This study aims to find a better way to measure pain and how well pain medications (analgesics) are working, especially in children and those who can't easily express their pain. Researchers will observe how a person's pupil (the black center of the eye) reacts to light over several hours after receiving pain relief. This reaction, called Pupillary Reflex Dilation (PRD), will be measured at specific times (0, 15, 30, 45, 60, 90, 120, and 180 minutes) to see if it can be a reliable way to understand pain and the effectiveness of treatment. You can join if you are between 7 and 21 years old, are receiving pain treatment at Children's National Medical Center Pain Clinic, and do not have an eye condition that would affect pupil measurements. The study plans to include 120 participants.

Study design

This is an observational study, meaning researchers will watch and collect information without providing new treatments. It plans to include 120 participants.

What's involved

You would have your pupil reactions measured at several time points (0, 15, 30, 45, 60, 90, 120, and 180 minutes) after receiving pain medication.

Compensation

Not stated in the trial record.

Follow-up

Pupillary Reflex Dilation (PRD) will be measured for up to 180 minutes (3 hours).

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.