Recruiting

Eye Focus Measurement

Sponsor:

Rochester Institute of Technology

Code:

NCT07679048

Conditions

Distance Viewing

Prolonged Near Viewing

Eligibility Criteria

Sex: All

Age: 18 - 35

Healthy Volunteers: Accepted

Interventions

Near viewing first

Distant viewing first

Study Details

Brief summary:

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.

Conditions

Distance Viewing

Prolonged Near Viewing

Study ID

NCT07679048

Start date

Jun 25, 2026

Status verified date

Jul, 2026

Completion date

Dec 15, 2026

Anticipated

Primary completion date

Dec 15, 2026

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18 - 35

Healthy Volunteers: Accepted

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

Study Design

Enrollment

20 participants

Anticipated

Allocation

Randomized

Intervention Model

Crossover

Primary purpose

Basic Science

Interventions and Outcome Measures

Arms

experimental: Near viewing first first

In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks. One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes. There are two types of sessions: one in which the screen is viewed first ('near viewing first'), and the other in which the distant object is viewed first ('distant viewing first'). All participants do both sessions. However, in one arm, participants do the 'near viewing first' session first.

experimental: 'Distant viewing first' first

In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks. One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes. There are two types of sessions: one in which the screen is viewed first ('near viewing first'), and the other in which the distant object is viewed first ('distant viewing first'). All participants do both sessions. However, in one arm, participants do the 'distant viewing first' session first.

Interventions

Near viewing first

In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks. One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes. In one intervention, the session is structured such that the screen is viewed first ('near viewing first').

Distant viewing first

In a given session of the experiment (1.5 hours), participants do 2 sets of accommodation tasks. One task happens after viewing a screen for 20 minutes at 25cm, and the other task happens after looking at a distant object (10m) for 20 minutes. In one intervention, the session is structured such that the distant object is viewed first ('distant viewing first').

Primary outcome measure

  • Gain and phase of ocular accommodation [ Time Frame: Each measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour. ]

Central Contacts and Locations

Central contacts

Benjamin M Chin, Doctorate

8454534320bmccis@rit.edu

Locations

Chester F. Carlson Center for Imaging Science

Recruiting

Rochester, New York, United States, 14623

Contacts

Benjamin M Chin, Doctorate

8454534320bmccis@rit.edu

More Information

Sponsor

Rochester Institute of Technology

Last update posted

Jul 8, 2026

Last verified

Jul, 2026

Keywords

  • Ocular accommodation
  • Physiological optics
  • Near vision

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-10. This information was provided to ClinicalTrials.gov by Rochester Institute of Technology on 2026-07-08.