Measuring How Quickly the Eye Focuses After Sustained Viewing of Close-up Images and Videos

In this experiment, subjects will view a cross pattern on the screen and be asked to focus their eyes on it. The cross pattern will look like it is moving towards and away from the eye in a back-and-forth motion. As the subjects focus their eyes on the shapes, the investigators will measure the focus of their eyes using a device called a wavefront sensor. This device uses infrared light to measure the optical properties of the eye in real time. Our goal is to find out how well the eye focuses before and after viewing images on a screen up close (25cm). Since many people spend a lot of time looking at a computer screen while at work or at school, it is important to understand how this affects the eye's ability to focus.

NCT Number	NCT07679048
Lead Sponsor	Rochester Institute of Technology Collaborators: National Eye Institute (NEI)
Conditions	Distance Viewing, Prolonged Near Viewing
Enrollment	20 participants
Start Date	2026-06-25
Primary Completion	2026-12-15 (estimated)
Study Completion	2026-12-15 (estimated)
Updated on ClinicalTrials.gov	2026-07-08