Measuring How Quickly the Eye Focuses After Sustained Viewing of Close-up Images and Videos
6. juli 2026 oppdatert av: Benjamin Chin, Rochester Institute of Technology
A Randomized, Repeated-measures Study to Measure the Temporal Frequency Response of Ocular Accommodation After Sustained Near Viewing.
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.
Studieoversikt
Status
Rekruttering
Intervensjon / Behandling
Detaljert beskrivelse
In this experiment, subjects will view a Maltese cross pattern on a display through a Badal relay.
Subjects will be instructed to accommodate to the pattern while a focus-adjustable lens optically moves the display closer and farther in depth as a sinusoidal function of time.
As they do so, the investigators will measure the wavefronts of their eyes using a Shack-Hartmann wavefront sensor.
The investigators will measure the gain and phase of the accommodative response of the subjects' eyes.
Measurements will be made before and after sustained viewing of images on a computer screen 25cm away.
Studietype
Intervensjonell
Registrering (Antatt)
20
Fase
- Ikke aktuelt
Kontakter og plasseringer
Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.
Studiekontakt
- Navn: Benjamin M Chin, Doctorate
- Telefonnummer: 8454534320
- E-post: bmccis@rit.edu
Studiesteder
-
-
New York
-
Rochester, New York, Forente stater, 14623
- Rekruttering
- Chester F. Carlson Center for Imaging Science
-
Ta kontakt med:
- Benjamin M Chin, Doctorate
- Telefonnummer: 8454534320
- E-post: bmccis@rit.edu
-
-
Deltakelseskriterier
Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
- Voksen
Tar imot friske frivillige
Ja
Beskrivelse
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
Studieplan
Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.
Hvordan er studiet utformet?
Designdetaljer
- Primært formål: Grunnvitenskap
- Tildeling: Randomisert
- Intervensjonsmodell: Crossover-oppdrag
- Masking: Ingen (Open Label)
Våpen og intervensjoner
Deltakergruppe / Arm |
Intervensjon / Behandling |
|---|---|
|
Eksperimentell: 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.
|
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').
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').
|
|
Eksperimentell: '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.
|
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').
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').
|
Hva måler studien?
Primære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
|---|---|---|
|
Gain and phase of ocular accommodation
Tidsramme: Each 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.
|
Each measurement takes 10 seconds. In the experiment, the investigators will take measurements over the course of approximately 1 hour.
|
Samarbeidspartnere og etterforskere
Det er her du vil finne personer og organisasjoner som er involvert i denne studien.
Samarbeidspartnere
Etterforskere
- Hovedetterforsker: Benjamin M Chin, Doctorate, Rochester Institute of Technology
Studierekorddatoer
Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.
Studer hoveddatoer
Studiestart (Antatt)
25. juni 2026
Primær fullføring (Antatt)
15. desember 2026
Studiet fullført (Antatt)
15. desember 2026
Datoer for studieregistrering
Først innsendt
25. juni 2026
Først innsendt som oppfylte QC-kriteriene
25. juni 2026
Først lagt ut (Faktiske)
1. juli 2026
Oppdateringer av studieposter
Sist oppdatering lagt ut (Faktiske)
8. juli 2026
Siste oppdatering sendt inn som oppfylte QC-kriteriene
6. juli 2026
Sist bekreftet
1. juli 2026
Mer informasjon
Begreper knyttet til denne studien
Ytterligere relevante MeSH-vilkår
Andre studie-ID-numre
- IRB0000131-Exp2
- 4R00EY036497-03 (U.S. NIH-stipend/kontrakt)
Legemiddel- og utstyrsinformasjon, studiedokumenter
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