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Measuring Eye Focus After Screen Time

This study is looking at how well your eyes focus after you've been looking at a screen up close for a while, compared to looking at something far away. Researchers want to understand how spending a lot of time on computers or phones affects your eye's ability to focus. You might be able to join if you are between 18 and 35 years old and have normal or corrected-to-normal vision. The study will measure how quickly your eye focuses (ocular accommodation) after different viewing tasks. The goal is to see if there are changes in how your eyes adjust their focus. The study is currently unclear on its status and plans to enroll 20 participants.

Study design
This is an interventional study with 20 participants. It compares two different viewing conditions: looking at a screen up close first, or looking at a distant object first.
What's involved
In each 1.5-hour session, you will do two sets of eye focus tasks. One task follows 20 minutes of screen viewing at 25cm, and the other follows 20 minutes of looking at a distant object.
Compensation
Not stated in the trial record.
Follow-up
Measurements will be taken over approximately 1 hour during the experiment. The study does not specify follow-up after this period.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.

NCT07679048

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

Recruiting
NAAges 18–35InterventionalBasic science
Rochester Institute of Technology
~20 participants
Updated 2026-07-08 on ClinicalTrials.gov
What's tested:Near viewing firstDistant viewing first

At a glance

Recruiting sites
1 of 1 listed site is recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Gain and phase of ocular accommodation
Measured over Each measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour.

Conditions

Distance Viewing
Prolonged Near Viewing

Explore related trials

Distance ViewingNear visionOcular accommodation powerPhysiological opticsProlonged Near Viewing

Where it's being run

1 sites across 1 states
New York1

Study leadership

  • Benjamin M Chin, Doctorate · PRINCIPAL_INVESTIGATOR · Rochester Institute of Technology

Who to contact

Benjamin M Chin, Doctorate
[email protected]
8454534320
Email the study team

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Do you actually qualify for this trial?

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Eligibility criteria

Inclusion

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

Exclusion

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

What this trial measures

  • Gain and phase of ocular accommodationEach measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour.

    Ocular accommodation is the focusing response of the lens in the eye. When the stimulus viewed by the participant changes in distance, the eye automatically refocuses. The investigators measure this refocusing using a device called a wavefront sensor. The investigators are particularly interested in the gain of accommodation, which is the ratio of the amplitude of accommodation to the amplitude of sinusoidal changes in stimulus distance. The investigators are also interested in the phase of the accommodative response, which is related to the lag of the accommodative response.