Ignite Creation Date:
2024-05-06 @ 6:59 PM
Last Modification Date:
2024-10-26 @ 2:58 PM
Study NCT ID:
NCT05852782
Status:
COMPLETED
Last Update Posted:
2023-05-10
First Post:
2023-04-27
Brief Title:
Effects of Light on the Choroid and Pupil
Sponsor:
University of Houston
Organization:
University of Houston
Study Overview
Official Title:
Effects of Narrowband and Broadband Light on Choroidal Thickness and Melanopsin-driven Pupil Response
Status:
COMPLETED
Status Verified Date:
2019-01
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Monochromatic light creates longitudinal chromatic aberration with short wavelength blue light forming a focal point in front of the retina and long wavelength red light forming a focal point behind the retina The investigators hypothesize that such chromatic aberrations induced by exposure to red or blue LED lights will cause the choroid behind the retina to respond to bring the image into focus by modulating its thickness either thickening in the case of blue light or thinning in the case of red light The magnitude and direction of this response is difficult to predict as previous studies have shown opposite findings in non-human primates and rodents Furthermore the investigators hypothesize that exposure to red or blue light will induce changes in how the pupil responds to light because the cells in the eye that are involved in pupil control are most sensitive to blue light
Detailed Description:
Ambient light exposure is associated with choroid thickness and eye growth The spectral composition of light which has been shown to play a role in eye growth can differentially regulate changes in choroid thickness by forming a focal point either in front of the retina in the case of short wavelength blue light or behind the retina in the case of long wavelength red light In addition melatonin suppression and the pupil light response specifically that driven by the intrinsically photosensitive retinal ganglion cells ipRGCs are most sensitive to short wavelength blue light Therefore the role of the wavelength of light on eye growth may involve ipRGC activity As such it is relevant to determine whether exposure to monochromatic light will alter choroidal thickness ipRGC activity and melatonin levels
The purpose of this study is to compare the short-term changes in choroid thickness melatonin concentration and the ipRGC-driven pupillary light response following one hour of light therapy with either short wavelength blue light or long wavelength red light It has previously been shown that a one week period of daily morning light therapy produces a short term increase in choroid thickness throughout the day Therefore the investigators hypothesize that one hour of morning light therapy with short wavelength blue light will result in different effects in the changes in choroid thickness melatonin levels and the ipRGC-driven pupillary light response compared to one hour of morning light therapy with long wavelength red light
The purpose of this study is to compare the short-term changes in choroid thickness melatonin concentration and the ipRGC-driven pupillary light response following one hour of light therapy with either short wavelength blue light or long wavelength red light It has previously been shown that a one week period of daily morning light therapy produces a short term increase in choroid thickness throughout the day Therefore the investigators hypothesize that one hour of morning light therapy with short wavelength blue light will result in different effects in the changes in choroid thickness melatonin levels and the ipRGC-driven pupillary light response compared to one hour of morning light therapy with long wavelength red light
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None