Advanced Imaging for Glaucoma Study

Glaucoma Clinical Trial

— AIGS  

Official title:

Advanced Imaging for Glaucoma Study

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01314326
• Other study ID #: OHSU IRB #00006611 - AIGS
• Secondary ID: R01EY013516
• Status: Completed
• First received: March 11, 2011
• Last updated: April 10, 2018
• Start date: September 2003
• Est. completion date: May 15, 2015

Study information

• Verified date: April 2018
• Source: Oregon Health and Science University
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The specific aims of the clinical studies are to:

1. Predict the development of glaucomatous visual field (VF) abnormality in glaucoma suspects and pre-perimetric glaucoma patients based on anatomic abnormalities detected by advanced imaging.

2. Predict the development of glaucomatous VF abnormality in glaucoma suspects and pre-perimetric glaucoma patients based on anatomic changes detected between successive advanced imaging tests.

3. Determine the sensitivity and specificity of glaucoma diagnosis based on advanced imaging tests.

Description:

Glaucoma is a leading cause of blindness in the US. Traditional methods of glaucoma diagnosis and monitoring lack good sensitivity and specificity. Delays in detecting glaucoma progression can lead to inadequate treatment and irreversible visual loss. Our goal is to improve glaucoma diagnosis by utilizing new imaging modalities that can reveal changes in the retinal layers affected by glaucoma and the associated reduction in retinal blood flow. Glaucoma selectively damages the retinal nerve fibers, which originate from cell bodies in ganglion cell layer (GCL) and travel to the optic nerve via the nerve fiber layer (NFL). We hypothesize that subtle damages in these structures can be detected earlier by optical coherence tomography (OCT) and other advanced imaging modalities than with current standard methods. OCT is based on infrared light reflectometry. It provides micrometer-scale cross-sectional images of retinal structures, which are not possible with other non-invasive techniques. More than 7,000 OCT systems are already being used for the diagnosis of glaucoma and retinal diseases. Phase I of the Advanced Imaging for Glaucoma (AIG) study demonstrated that peripapillary NFL thickness measured with the standard timedomain (TD) OCT technology has higher glaucoma diagnostic accuracy than other quantitative diagnostic technologies such as scanning laser polarimetry (SLP) and scanning laser tomography (SLT). We also demonstrated that more advanced diagnostic software and faster Fourier-domain (FD) OCT systems can achieve even better diagnostic accuracy and reproducibility. In the proposed Phase II of the AIG study, we will continue the most promising aspects of the research to further improve both technology and clinical practice.

The AIG Partnership investigators at the Oregon Health & Science University (OHSU), Massachusetts Institute of Technology (MIT), and University of Pittsburgh (UP) include those who invented OCT and pioneered its applications to glaucoma. OHSU, University of Southern California (USC), UP and University of Miami (UM) also have major glaucoma referral centers.

The Partnership combines engineers and clinicians who have the track record and synergy to develop novel technologies, evaluate them in a rigorous clinical study, and transfer the knowledge to industry and medicine.

The Specific Aims of this competing renewal proposal are:

1. Develop image processing and diagnostic analysis for 3-dimensional OCT data. The AIG study is currently using 26 kHz (axial scan repetition rate) FD-OCT technology that is capable of scanning the macula and the optic nerve head in a fraction of a second. We have completed computer algorithms for mapping and analysis of the macular ganglion cell complex (mGCC) and the peripapillary NFL, which lead to significant improvement in diagnostic accuracy. We propose to continue the work on disc cupping analysis, NFL reflectivity analysis, and expert system combination of multiple anatomic parameters to further improve diagnostic accuracy. Algorithms to detect progression of glaucoma over time are also planned.

2. Develop ultrafast OCT systems for imaging of the macula and optic nerve head. Although current FD-OCT technology at 26 kHz represents a tremendous advance over standard 400 Hz TD-OCT (Zeiss Stratus), it still takes ~4 seconds for a full 3-dimensional (3D) raster scan of the macula. Our goal is to reduce this time to 0.1-0.2 second so 3D scans will be minimally affected by eye movement. This requires an ultrafast speed of 500-1000 kHz. We plan to adapt the Fourier-domain modelocked-laser (FDML) swept-source OCT, which has already been demonstrated at 249 kHz at MIT. We will further improve its speed to 500 kHz. The short integration time and phase stability of FDML-OCT is ideal for Doppler perfusion measurement (see next aim). For an even faster speed, parallel line-scan FD-OCT at 1 MHz will be developed. Line-scan OCT is not suitable for Doppler flow measurement due to the relatively long integration time, but is more efficient for ultrafast anatomic imaging. It will allow full 8x8 mm macular 3D imaging in 0.2 second. We will also continue to develop polarization-sensitive (PS) OCT for NFL birefringence measurement, which will also be greatly enhanced by higher speed and greater averaging to suppress noise.

3. Develop Doppler OCT to measure retinal perfusion. One of the significant achievements of the AIG project is the demonstration of a reproducible method of measuring total retinal blood flow using Doppler FD-OCT. Reduced flow was found in glaucomatous eyes, opening an important new approach to measure the severity of glaucoma and assess the risk for further progression. An automated algorithm will be developed to improve the robustness of Doppler flow measurement. We will also investigate Doppler OCT with the ultrafast FDML-OCT system.

4. Evaluate OCT technologies in a longitudinal clinical study. An extension of the ongoing clinical study is proposed. Participants (1000 planned with 700+ already enrolled) in normal, glaucoma suspect, and glaucoma groups will be followed. OCT and other imaging technologies will be compared for diagnostic accuracy, detection of early progression, and prediction of future visual field loss. The impact of intraocular pressure on retinal blood flow and how flow affects the risk of glaucoma will also be studied.

Quantitative imaging technologies such as OCT have improved glaucoma management by reducing reliance on insensitive tests such as perimetry and subjective disc grading. The AIG Partnership comprises engineers and clinicians who co-invented OCT. We propose to further improve its performance with higher speed, more sophisticated software, and novel functional measurements. The eventual goal is to save vision by basing glaucoma treatment decisions on speedy and reliable imaging tests.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 832
• Est. completion date: May 15, 2015
• Est. primary completion date: May 15, 2015
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 40 Years to 79 Years

Eligibility

Inclusion Criteria for Normal Participants:

• No history of glaucoma, retinal pathology, keratorefractive surgery, or corticosteroid use.

• Normal visual field (VF), intraocular pressure (IOP), optic nerve head and nerve fiber layer.

• Central pachymetry > 500 µm.

• Open angle.

Inclusion Criteria for Glaucoma Suspects & Pre-Perimetric Glaucoma Participants:

• Ocular hypertension, defined as IOP = 24 mmHg in one eye and IOP = 22 mmHg in the fellow eye, on or off glaucoma medications.

• Optic nerve head (ONH) or nerve fiber layer (NFL) defect visible on slit-lamp biomicroscopy and stereo color fundus photography as defined for the PG group.

• The fellow eye meeting the eligibility criteria for the PG group.

• GSPPG eyes must not have an abnormal VF as defined for the PG group.

• GSPPG participants having glaucomatous ONH or NFL defect are subclassified as PPG; the remainder are subclassified as GS.

Inclusion Criteria for Perimetric Glaucoma Participants:

• Abnormal VF and

• Glaucomatous ONH of NFL defect.

Exclusion Criteria Common to All Groups:

• Best corrected visual acuity worse than 20/40.

• Age < 40 or > 79 years.

• Refractive error > +3.0D or < -7.0 D.

• Previous intraocular surgery except for uncomplicated cataract extraction with posterior chamber IOL implantation.

• Diabetic retinopathy or other disease that may cause visual field loss or optic disc abnormalities.

• Inability to clinically view or photograph the optic discs due to media opacity or poorly dilating pupil.

• Inability to obtain advanced imaging data with acceptable quality or reliable VF test results.

• Life-threatening or debilitating illness making it unlikely patient could successfully complete the study.

• Refusal of informed consent or of commitment to the full length of the study.

Related Conditions & MeSH terms

• Glaucoma

Locations

Country	Name	City	State
United States	Massachusettes Institute of Technology	Boston	Massachusetts
United States	University of Southern California, Doheny Eye Institute	Los Angeles	California
United States	University of Miami, Bascom Palmer Eye Institute	Miami	Florida
United States	University of Pittsburgh	Pittsburgh	Pennsylvania
United States	Oregon Health & Science University, Casey Eye Institute	Portland	Oregon

Sponsors (2)

Lead Sponsor	Collaborator
Oregon Health and Science University	National Eye Institute (NEI)

Country where clinical trial is conducted

United States, 

References & Publications (22)

Alasil T, Tan O, Lu AT, Huang D, Sadun AA. Correlation of Fourier domain optical coherence tomography retinal nerve fiber layer maps with visual fields in nonarteritic ischemic optic neuropathy. Ophthalmic Surg Lasers Imaging. 2008 Jul-Aug;39(4 Suppl):S71-9. — View Citation

Asrani S, Sarunic M, Santiago C, Izatt J. Detailed visualization of the anterior segment using fourier-domain optical coherence tomography. Arch Ophthalmol. 2008 Jun;126(6):765-71. doi: 10.1001/archopht.126.6.765. — View Citation

Greenfield DS, Weinreb RN. Role of optic nerve imaging in glaucoma clinical practice and clinical trials. Am J Ophthalmol. 2008 Apr;145(4):598-603. doi: 10.1016/j.ajo.2007.12.018. Epub 2008 Mar 4. Review. — View Citation

Grzywacz NM, de Juan J, Ferrone C, Giannini D, Huang D, Koch G, Russo V, Tan O, Bruni C. Statistics of optical coherence tomography data from human retina. IEEE Trans Med Imaging. 2010 Jun;29(6):1224-37. doi: 10.1109/TMI.2009.2038375. Epub 2010 Mar 18. — View Citation

Huang XR, Knighton RW, Shestopalov V. Quantifying retinal nerve fiber layer thickness in whole-mounted retina. Exp Eye Res. 2006 Nov;83(5):1096-101. Epub 2006 Jul 7. — View Citation

Huang XR, Knighton RW. Microtubules contribute to the birefringence of the retinal nerve fiber layer. Invest Ophthalmol Vis Sci. 2005 Dec;46(12):4588-93. — View Citation

Memarzadeh F, Li Y, Chopra V, Varma R, Francis BA, Huang D. Anterior segment optical coherence tomography for imaging the anterior chamber after laser peripheral iridotomy. Am J Ophthalmol. 2007 May;143(5):877-9. Epub 2006 Dec 29. — View Citation

Memarzadeh F, Tang M, Li Y, Chopra V, Francis BA, Huang D. Optical coherence tomography assessment of angle anatomy changes after cataract surgery. Am J Ophthalmol. 2007 Sep;144(3):464-5. — View Citation

Mumcuoglu T, Townsend KA, Wollstein G, Ishikawa H, Bilonick RA, Sung KR, Kagemann L, Schuman JS Manuscript #AJO-08-106. Am J Ophthalmol Accepted for Publication: May 28, 2008.

Pedersen CJ, Huang D, Shure MA, Rollins AM. Measurement of absolute flow velocity vector using dual-angle, delay-encoded Doppler optical coherence tomography. Opt Lett. 2007 Mar 1;32(5):506-8. — View Citation

Potsaid B, Baumann B, Huang D, Barry S, Cable AE, Schuman JS, Duker JS, Fujimoto JG. Ultrahigh speed 1050nm swept source/Fourier domain OCT retinal and anterior segment imaging at 100,000 to 400,000 axial scans per second. Opt Express. 2010 Sep 13;18(19):20029-48. doi: 10.1364/OE.18.020029. — View Citation

Sadda SR, Tan O, Walsh AC, Schuman JS, Varma R, Huang D. Automated detection of clinically significant macular edema by grid scanning optical coherence tomography. Ophthalmology. 2006 Jul;113(7):1187.e1-12. Epub 2006 May 2. — View Citation

Sarunic MV, Applegate BE, Izatt JA. Real-time quadrature projection complex conjugate resolved Fourier domain optical coherence tomography. Opt Lett. 2006 Aug 15;31(16):2426-8. — View Citation

Sehi M, Greenfield DS. Assessment of retinal nerve fiber layer using optical coherence tomography and scanning laser polarimetry in progressive glaucomatous optic neuropathy. Am J Ophthalmol. 2006 Dec;142(6):1056-9. Epub 2006 Sep 5. — View Citation

Sehi M, Ume S, Greenfield DS. Scanning laser polarimetry with enhanced corneal compensation and optical coherence tomography in normal and glaucomatous eyes. Invest Ophthalmol Vis Sci. 2007 May;48(5):2099-104. — View Citation

Sung KR, Wollstein G, Schuman JS, Bilonick RA, Ishikawa H, Townsend KA, Kagemann L, Gabriele ML; Advanced Imaging in Glaucoma Study Group. Scan quality effect on glaucoma discrimination by glaucoma imaging devices. Br J Ophthalmol. 2009 Dec;93(12):1580-4. doi: 10.1136/bjo.2008.152223. Epub 2009 Aug 18. — View Citation

Tan O, Chopra V, Lu AT, Schuman JS, Ishikawa H, Wollstein G, Varma R, Huang D. Detection of macular ganglion cell loss in glaucoma by Fourier-domain optical coherence tomography. Ophthalmology. 2009 Dec;116(12):2305-14.e1-2. doi: 10.1016/j.ophtha.2009.05.025. Epub 2009 Sep 10. — View Citation

Tan O, Li G, Lu AT, Varma R, Huang D; Advanced Imaging for Glaucoma Study Group. Mapping of macular substructures with optical coherence tomography for glaucoma diagnosis. Ophthalmology. 2008 Jun;115(6):949-56. Epub 2007 Nov 5. — View Citation

Wang Y, Bower BA, Izatt JA, Tan O, Huang D. In vivo total retinal blood flow measurement by Fourier domain Doppler optical coherence tomography. J Biomed Opt. 2007 Jul-Aug;12(4):041215. — View Citation

Wang Y, Fawzi AA, Varma R, Sadun AA, Zhang X, Tan O, Izatt JA, Huang D. Pilot study of optical coherence tomography measurement of retinal blood flow in retinal and optic nerve diseases. Invest Ophthalmol Vis Sci. 2011 Feb 11;52(2):840-5. doi: 10.1167/iovs.10-5985. Print 2011 Feb. — View Citation

Wang Y, Lu A, Gil-Flamer J, Tan O, Izatt JA, Huang D. Measurement of total blood flow in the normal human retina using Doppler Fourier-domain optical coherence tomography. Br J Ophthalmol. 2009 May;93(5):634-7. doi: 10.1136/bjo.2008.150276. Epub 2009 Jan 23. — View Citation

Zhao M, Izatt JA. Single-camera sequential-scan-based polarization-sensitive SDOCT for retinal imaging. Opt Lett. 2009 Jan 15;34(2):205-7. — View Citation

* Note: There are 22 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Developing glaucoma or progression with glaucoma as defined by study criteria		5 years or the end of the study

External Links

•   AIGS main website