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

Rochester Institute of Technology · with National Eye Institute (NEI) · NCT07679048

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Key facts

Compensation
Not posted. Ask the study team before screening.
Who can join
Ages 18–35 · All sexes
Healthy volunteers
Accepted
Study type
Interventional · Not applicable
Target enrollment
20
US sites recruiting
1
Study start
June 25, 2026
Record last updated
July 8, 2026

Status re-checked against ClinicalTrials.gov within the last 12 hours.

What the study is about

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.

Being studied: Near viewing first; Distant viewing first

Conditions: Distance Viewing; Prolonged Near Viewing

Eligibility criteria

Copied from the official record. The study team makes the final decision at screening.

Show full criteria

Inclusion Criteria

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

Exclusion Criteria

  • 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

Recruiting US locations

  • Chester F. Carlson Center for Imaging Science

    Rochester, NY 14623

    Site contact: Benjamin M Chin, Doctorate · 8454534320 · bmccis@rit.edu

Study contacts (from the official record)

  • Benjamin M Chin, Doctorate · 8454534320 · bmccis@rit.edu
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