The Effect of Varying Brightness on Palpebral Aperture
The Effect of Varying Brightness Levels on Palpebral Aperture and the Point of Orbicularis Engagement Using EEG Signalling.
Studieoversigt
Status
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
Our study will aim to establish the point of orbicularis engagement based on luminous intensity Murray et al. created an Ocular Stress Monitor to see if the contracture of the muscles on the eyelid indicative of pain as a light source was increased in luminosity 8 Our study will go one step further by using video technology and a portable EEG machine to detect the pulses of lid contracture as luminosity of a ring light i s increased incrementally. An advanced calibrated datalogging LED light meter will simultaneously record the level of brightness to establish at which point the spike in EEG occurs. Screenshots from the video recording will be taken and accurate MRD1 measurements can be taken at the point of orbicular i s engagement.
The scientific justification for this research question is twofold We wish to establish the threshold at which orbicularis engages such that palpebral aperture and MRD measurements are altered. This is relevant to the technique of taking these measurements in the clinical environment and the light intensity at which these measurements are taken. We wish to establish the light intensity which should not be exceeded to take these measurements. As photography becomes increasingly used in oculoplastic s clinics we envisage palpebral aperture and MRD1 measurements being performed digitally rather than manually These measurements are relevant to pre operative and post operative imaging, and surgical planning. Furthermore, our results maybe applicable more widely to industry, for example vehicle headlights, bicycle lights, camera flash, workplace lighting.
Reference: Murray I, Plainis S, Carden D. The ocular stress monitor: a new device for measuring discomfort glare. Lighting Research Technology. 2002;34(3):231 239.
Undersøgelsestype
Tilmelding (Forventet)
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiesteder
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London, Det Forenede Kongerige, NW3 2QY
- Ophthalmology, Royal Free Hospital
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Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- Aged between 18 and 65 years of age
- A member of the Royal Free NHS trust
Exclusion Criteria:
- No known ocular pathology
- No lid problems/ptosis or previous lid surgery
- No contact lenses in for duration of experiment
- No pseudophakia
- No neurological disease
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Grundvidenskab
- Tildeling: Ikke-randomiseret
- Interventionel model: Enkelt gruppeopgave
- Maskning: Ingen (Åben etiket)
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
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Eksperimentel: The observation of eyelid positioning and EEG pulses from the eyelid on increasing brightness
In a dimly lit room the participant will place their chin on the slit lamp We will use t he optimal background illumination used for Humphrey and Goldman visual fields which is 31.5 apostilbs (10Lux 9 They will look into the video camera placed 50cm away, which will have a dimmable remote control ring light fitted around it.
The part icipant will have a reference measure taped to the headrest and three electrodes placed around the right eye.
One active electrode place on the lower lid and one reference electrode towards the temporal margin and one earth electrode placed on the forehead The brightness of the ring light will be increased via the dimmer switch whilst simultaneously recording the lux with the LED light meter.
The participant will be advised t o close their eyes if the brightness becomes uncomfortable and this will be repea ted three times.
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Up to 30 seconds, three times, looking into a video camera as glare is incrementally increased.
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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The point at which the eyelid begins to contract under what brightness level
Tidsramme: All carried out within a 2 week period
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Using a light meter, ring light, and EEG machine
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All carried out within a 2 week period
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Samarbejdspartnere og efterforskere
Sponsor
Datoer for undersøgelser
Studer store datoer
Studiestart (Faktiske)
Primær færdiggørelse (Forventet)
Studieafslutning (Forventet)
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Faktiske)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 1062/RD
Plan for individuelle deltagerdata (IPD)
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IPD-planbeskrivelse
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