Measuring How Quickly the Eye Focuses After Sustained Viewing of Close-up Images and Videos
A Randomized, Repeated-measures Study to Measure the Temporal Frequency Response of Ocular Accommodation After Sustained Near Viewing.
Who can join
Ages 18 to 35 · All sexes · Healthy volunteers welcome
Full eligibility 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
About the study
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.
What is being tested
- Near viewing first (other)
- Distant viewing first (other)
Sponsor: Rochester Institute of Technology · Participants: 20 · Started: Jun 25, 2026
Contact the study team
- Benjamin M Chin, Doctorate · Phone: 8454534320
Official record on ClinicalTrials.gov — NCT07679048
Locations in the U.S.
| New York | Chester F. Carlson Center for Imaging Science, Rochester |
Conditions
From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.