Clinical trial NCT02118922: A Study to Test the Diagnostic Potential of Brillouin Microscopy for Corneal Ectasia
Official title: A Study to Test the Diagnostic Potential of Brillouin Microscopy for Corneal Ectasia
Study type: OBSERVATIONAL
Overall status: RECRUITING
Conditions: Keratoconus
Ectasia
Crosslinking
Fuchs' Endothelial Dystrophy
Keywords: LASIK
Lead sponsor: Massachusetts General Hospital
Sponsor class: OTHER
Collaborators: name: Harvard Medical School (HMS and HSDM)
First posted: 2014-04-21
Enrollment: 168
Sex: ALL
Minimum age (years): 20
Maximum age (years): 75
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: General population

Brief summary: We have developed novel Brillouin microscopy and we are testing its potential for keratoconus and ectasia diagnostics. We plan to perform axial scans of the cornea in human volunteers in order to compare biomechanical properties of Keratoconus vs. Normal corneas and compare biomechanical properties of post-LASIK ectasia vs. normal corneas.


Eligibility criteria: Inclusion Criteria:

Group I includes healthy subjects with normal appearing corneas, normal topography and pachymetry. Group II includes patients diagnosed as having mild, moderate or advanced keratoconus by our ophthalmology expert on the basis of topography and pachymetry. Group III includes healthy subjects who have undergone LASIK surgery in the past 12 months without complications. Inclusion criteria include normal post-operative topography and pachymetry. Group IV includes patients (age 20 - 60) who have undergone LASIK surgery at least 12 months before the study imaging and have been diagnosed with post-LASIK ectasia based on topography, pachymetry and clinical evaluation.Patients diagnosed with keratoconus. Group V- Volunteers to receive PRK surgery This group includes patients who have been diagnosed with myopia and have been scheduled to undergo PRK surgery. Patients with high astigmatism \> 2 diopter, prior ocular surgeries, and those patients taking any ocular medications except seasonal allergy medicine such as ketotifen or artificial tears will be excluded. Group VI-Volunteers to receive LASIK Surgery This group includes myopic patients who are scheduled to receive LASIK surgery. Patients with high astigmatism \> 2 diopter, prior ocular surgeries, and those patients taking any ocular medications except seasonal allergy medicine such as ketotifen and artificial tears will be excluded. Group VII- Patients with Fuch's Endothelial Corneal Dystrophy. This group includes subjects who are diagnosed with Fuch's corneal dystrophy, at early, mild and advanced stages. The inclusion also extends to subjects with, and without keratoconus. But this exclude patients with any other corneal disorders other than keratoconus, and/or history of ophthalmological surgeries that may affect endothelium cell status, e.g. cataract surgeries.

Overall Exclusion Criteria for all groups: Volunteers who

* Have occludable narrow angles (without a patent peripheral iridotomy)
* Monocular subjects
* Do not or cannot understand the instructions for the imaging

Primary outcomes:
measure: Elastic Modulus of the Cornea
timeFrame: 2012-2022
Secondary outcomes:
Other outcomes:
Locations:
city: Boston
country: United States
facility: Massachusetts General Hospital
state: Massachusetts
Study officials:
affiliation: Masachusetts General Hospital
name: Andy Yun, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Scarcelli G, Kling S, Quijano E, Pineda R, Marcos S, Yun SH. Brillouin microscopy of collagen crosslinking: noncontact depth-dependent analysis of corneal elastic modulus. Invest Ophthalmol Vis Sci. 2013 Feb 19;54(2):1418-25. doi: 10.1167/iovs.12-11387.
citation: Scarcelli G, Yun SH. In vivo Brillouin optical microscopy of the human eye. Opt Express. 2012 Apr 9;20(8):9197-202. doi: 10.1364/OE.20.009197.
citation: Scarcelli G, Pineda R, Yun SH. Brillouin optical microscopy for corneal biomechanics. Invest Ophthalmol Vis Sci. 2012 Jan 20;53(1):185-90. doi: 10.1167/iovs.11-8281.
citation: Scarcelli G, Yun SH. Confocal Brillouin microscopy for three-dimensional mechanical imaging. Nat Photonics. 2007 Dec 9;2:39-43. doi: 10.1038/nphoton.2007.250.