Correlation Between In-vivo Anatomy of Corneal Dystrophies as Assessed by High- Resolution Optical Coherence Tomography (OCT) Measurement and Histological Examination

NCT03461991 | Completed

• 1 other identifier: OPHT-270617
• Study Type: interventional
• Target: 2
• Locations: 1 country
• Sites: 2

Brief Summary

Corneal dystrophies are usually classified histopathologically according to the layer of the cornea that is affected. The International Committee for the Classification of Corneal Dystrophies (IC3D) takes this anatomical classification as referral with summarizing clinical, genetic, and pathological data. Most of this classification relies on slit lamp findings or histologic specimen, since in-vivo imaging of corneal microstructures has only become available in the recent years. With confocal microscopy it is possible to image corneal microstructures at a high resolution, but this technique is limited by its reduced repeatability and the fact that only a small area can be imaged. By the use of optical coherence tomography (OCT) systems it is possible to overcome these limitations. Commercially available systems, however, only have an axial resolution of about 18 µm which is not sufficient for imaging of all corneal layers. Recently, a high-resolution optical coherence tomography (OCT) system was developed at the Center for Medical Physics and Biomedical Engineering that enables a resolution of about 1 µm. With this resolution, all corneal structures and several pathologies can be visualized. In the present study the investigators want to use this OCT system to image corneal dystrophies in patients scheduled for corneal transplantation.

Conditions

Corneal Dystrophy

Outcome Measures

Primary Outcomes (1)

• Correlation in measurement of corneal layers in preoperative high-resolution OCT and histological diagnosis of corneal dystrophies of the removed cornea

  Preoperative high-resolution OCT measurement of the corneal layers in the study eye will be performed to assess corneal dystrophies. The corneal tissue removed during surgery will then be sent to the Institute for Clinical Pathology for histological preparation and diagnosis of corneal dystrophies. The correlation between the preoperative measurement and histological diagnosis will be shown to assess the accuracy of measuring corneal layers in high-resolution OCT imaging.

  preoperative

Study Arms (1)

Patients scheduled for corneal transplantation

OTHER

Device: Ultrahigh resolution Spectral Domain OCT

Interventions

Ultrahigh resolution Spectral Domain OCT DEVICE

A spectrometer based ultrahigh resolution Spectral Domain OCT (SDOCT) system operating at 800 nm for the anterior chamber will be employed in the present study. The spectrum of the Ti:Sapphire laser light source is centered at 800 nm. With a full width at half maximum bandwidth of 170 nm, the axial resolution is 1.3 μm in the cornea. The transverse resolution of the employed OCT system is 21 μm at the front surface of the cornea. For measurement, patients will place their head in a modified slit lamp head rest. During the measurement period, patients will be asked to look straight forward onto an internal fixation target and to avoid blinking. Different scattering patterns, e.g. raster, circular and spiral scans will be employed.

Patients scheduled for corneal transplantation

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Men and women aged over 18 years
• Presence of corneal dystrophy
• Scheduled for corneal transplantation (PK, ALK, DALK, DSAEK or DMEK)
• No previous corneal surgery in the study eye

You may not qualify if:

• Participation in a clinical trial in the previous 3 weeks
• Presence of any abnormalities preventing reliable measurements as judged by the investigator
• Pregnancy, planned pregnancy or lactating

Sponsors & Collaborators

• Medical University of Vienna: lead

Study Sites (2)

Vienna Institute for Research in Ocular Surgery (VIROS)

Vienna, Vienna, 1140, Austria

Location

Department of Clinical Pharmacology, Medical University of Vienna

Vienna, Vienna, A-1090, Austria

Location

MeSH Terms

Conditions

Corneal Dystrophies, Hereditary

Condition Hierarchy (Ancestors)

Corneal Diseases; Eye Diseases; Eye Diseases, Hereditary; Genetic Diseases, Inborn; Congenital, Hereditary, and Neonatal Diseases and Abnormalities

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: DIAGNOSTIC
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assoc. Prof. Priv.-Doz. Dr.

Study Record Dates

• First Submitted: January 2, 2018
• First Posted: March 12, 2018
• Study Start: August 21, 2018
• Primary Completion: August 29, 2022
• Study Completion: August 29, 2022
• Last Updated: May 23, 2025

Record last verified: 2022-04

Data Sharing

• IPD Sharing: Will not share

Locations

AU (2)