Clinical trial NCT01981148: Measurement of Retinal Auto Fluorescence With a Fluorescence Lifetime Imaging Ophthalmoscope
Official title: Measurement of Retinal Auto Fluorescence With a Fluorescence Lifetime Imaging Ophthalmoscope
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Autofluorescence Imaging
Neuroimaging
Lead sponsor: Insel Gruppe AG, University Hospital Bern
Sponsor class: OTHER
First posted: 2013-11-11
Enrollment: 600
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: The study population will consist of patients and healthy subjects attending the department of ophthalmology at the University of Bern

Brief summary: Fluorescent lifetime microscopy has emerged as a useful tool to study fluorescent lifetimes in vitro. Fluorescence lifetime represents the average amount of time a fluorophore remains in the excited state following excitation and depends on the fluorophores molecular environment. Fluorescence lifetime ophthalmoscopy (FLIO) is a technique which can quantify fluorescence lifetimes in the human retina in vivo. The purpose of this study is to investigate fluorescence lifetime characteristics in the human retina by using a FLIO. The investigators hypothesize that FLIO will allow to identify areas of retinal metabolic stress such as ischemia by detecting changes in fluorescence lifetimes.

Detailed description: Background

Ophthalmic imaging has made considerable progress in the last years. Especially the introduction of optical coherence tomography and the scanning laser ophthalmoscope has helped to understand the structural changes underlying various retinal diseases. However, the appearance of structural changes during retinal disease often represents irreversible functional loss with only limited treatment options. In order to prevent loss of vision, retinal diseases should ideally be diagnosed before structural changes occur. This can be achieved by imaging metabolic changes of the retina as most retinal diseases such as age related macular degeneration or diabetic retinopathy are associated with distinct metabolic changes, mainly related to oxidative stress.

Recently, a novel device for imaging fluorescent lifetimes of the retina in vivo, the fluorescent lifetime ophthalmoscope (FLIO), has been developed. This device is able to measure fluorescence lifetimes in the retina on a macroscopic level and may be able to shed new light on metabolic diseases of the retina.

Objective

To define fluorescence lifetime characteristics in healthy patients and patients with various retinal diseases.

Methods

The investigators will use a novel device, the fluorescence lifetime ophthalmoscope (FLIO) to investigate fluorescence lifetimes in the human retina.

Eligibility criteria: Inclusion Criteria:

* Subject must be willing to give written informed consent
* Healthy volunteers 18 years of age or greater
* Patients 18 years of age or greater
* No significant media opacities

Exclusion Criteria

* Opacities of ocular media excluding detailed observation of the retina

Primary outcomes:
measure: Fluorescence lifetime measured by a fluorescence lifetime imaging ophthalmoscope
timeFrame: at baseline
Secondary outcomes:
measure: Repeatability of FLIO
timeFrame: at baseline
Other outcomes:
Locations:
city: Bern 3010
country: Switzerland
facility: Department of Ophthalmology, Bern University Hospital, Bern, 3010 Bern, Switzerland
Study officials:
affiliation: Inselspital, University Clinic Ophthalmology
name: Martin Zinkernagel, Prof.Dr.Dr.
role: STUDY_CHAIR
References:
citation: Klemm M, Dietzel A, Haueisen J, Nagel E, Hammer M, Schweitzer D. Repeatability of autofluorescence lifetime imaging at the human fundus in healthy volunteers. Curr Eye Res. 2013 Jul;38(7):793-801. doi: 10.3109/02713683.2013.779723. Epub 2013 Mar 26.
citation: Schweitzer D, Gaillard ER, Dillon J, Mullins RF, Russell S, Hoffmann B, Peters S, Hammer M, Biskup C. Time-resolved autofluorescence imaging of human donor retina tissue from donors with significant extramacular drusen. Invest Ophthalmol Vis Sci. 2012 Jun 8;53(7):3376-86. doi: 10.1167/iovs.11-8970.
citation: Schweitzer D, Quick S, Klemm M, Hammer M, Jentsch S, Dawczynski J. [Time-resolved autofluorescence in retinal vascular occlusions]. Ophthalmologe. 2010 Dec;107(12):1145-52. doi: 10.1007/s00347-010-2195-7. German.
citation: Dysli C, Quellec G, Abegg M, Menke MN, Wolf-Schnurrbusch U, Kowal J, Blatz J, La Schiazza O, Leichtle AB, Wolf S, Zinkernagel MS. Quantitative analysis of fluorescence lifetime measurements of the macula using the fluorescence lifetime imaging ophthalmoscope in healthy subjects. Invest Ophthalmol Vis Sci. 2014 Apr 3;55(4):2106-13. doi: 10.1167/iovs.13-13627.
citation: Lincke JB, Dysli C, Jaggi D, Solberg Y, Wolf S, Zinkernagel MS. LONGITUDINAL FOVEAL FLUORESCENCE LIFETIME CHARACTERISTICS IN GEOGRAPHIC ATROPHY USING FLUORESCENCE LIFETIME IMAGING OPHTHALMOSCOPY. Retina. 2021 Nov 1;41(11):2391-2398. doi: 10.1097/IAE.0000000000003222.
citation: Dysli C, Dysli M, Lincke J, Jaggi D, Wolf S, Zinkernagel MS. IMAGING ARTIFACTS IN FLUORESCENCE LIFETIME IMAGING OPHTHALMOSCOPY. Retina. 2021 Nov 1;41(11):2378-2390. doi: 10.1097/IAE.0000000000003235.
citation: Dysli C, Wolf S, Hatz K, Zinkernagel MS. Fluorescence Lifetime Imaging in Stargardt Disease: Potential Marker for Disease Progression. Invest Ophthalmol Vis Sci. 2016 Mar;57(3):832-41. doi: 10.1167/iovs.15-18033.