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

Recruiting now · Not applicable

Conditions studied: Distance Viewing, Prolonged Near Viewing

In brief

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.

Key facts

Study ID

NCT07679048

Run by

Rochester Institute of Technology

People needed

20

Starts

2026-06-25

Expected to finish

2026-12-15

Last updated by the study team

2026-07-08

Who can join

Age: 18 and older, up to 35. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Between 18-35 years of age
• Normal or corrected-to-normal (glasses/contact lenses) vision.

You may not qualify if…

• Vision worse than 20/20 while wearing glasses / contact lenses.
• Fragile or loose teeth (participants need to bite a piece of dental clay to stabilize their heads so that measurements can be taken from their eyes)
• Current pregnancy (experiment requires sitting down without moving for stretches of time)
• Heart disease
• Personal/familial history of epilepsy

Where it is running

• Chester F. Carlson Center for Imaging Science — Rochester, New York, United States (enrolling)

Full record on ClinicalTrials.gov

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