Purpose. To characterize age-related differences in the magnitude of Spectral Domain Optical Coherence Tomography (SDOCT) structural change in early experimental glaucoma (EG). Methods. Both eyes from 4 young (1.4 - 2.6 yrs) and 4 old (18.6 - 21.9 yrs) rhesus monkeys were imaged at least 3 times at baseline, and then every 2 weeks following laser-induced, chronic, unilateral IOP elevation until the onset of EG (Confocal Scanning Laser Tomographic surface change confirmed twice). Two to 20 weeks after EG onset, animals were sacrificed and optic nerve axon counts for all eyes were performed. Masked operators delineated retinal and ...

Purpose: To evaluate the effect of age on optic nerve axon counts, spectral-domain optical coherence tomography (SDOCT) scan quality, and peripapillary retinal nerve fiber layer thickness (RNFLT) measurements in healthy monkey eyes. Methods: In total, 83 healthy rhesus monkeys were included in this study (age range: 1.2–26.7 years). Peripapillary RNFLT was measured by SDOCT. An automated algorithm was used to count 100% of the axons and measure their cross-sectional area in postmortem optic nerve tissue samples ( N = 46). Simulation experiments were done to determine the effects of optical changes on measurements of RNFLT. An objective, fully-automated method ...

Purpose To quantify the effects of using the fovea to Bruch's membrane opening (FoBMO) axis as the nasal-temporal midline for 30° sectoral (clock-hour) spectral domain optical coherence tomography (SDOCT) optic nerve head (ONH) minimum rim width (MRW) and area (MRA) calculations. Methods The internal limiting membrane and BMO were delineated within 24 radial ONH B-scans in 222 eyes of 222 participants with ocular hypertension and glaucoma. For each eye the fovea was marked within the infrared reflectance image, the FoBMO angle (θ) relative to the acquired image frame (AIF) horizontal was calculated, the ONH was divided into 30°sectors using ...

Emanuel Hospital Received a 2013 NIH Grant for $344.250 to study the Optical Nerve Head Using SD-OCT Imaging in Glaucoma. The principal investigator is Claude Burgoyne. The program began in 2010 and ends in 2014. Below is a summary of the proposed work. The primary goal of this project is to test three hypotheses regarding glaucomatous damage to the visual system. First, that clinically detectable neural, glial and connective tissue alterations occur deep in the optic nerve head (ONH) at a very early stage in the pathophysiology of glaucomatous damage to the visual system. Second, that the location and ...

Purpose. To determine if the detection of spectral domain optical coherence tomography (SDOCT) optic nerve head (ONH) change precedes the detection of Confocal Scanning Laser Tomography (CSLT) ONH surface, SDOCT retinal nerve fiber layer (RNFL), Scanning Laser Perimetry (SLP) and multifocal electroretinography (mfERG) change in 8 experimental glaucoma (EG) eyes. Methods. Both eyes from 8 monkeys were tested at least 3 times at baseline, and then every 2 weeks following laser-induced chronic unilateral IOP elevation. Event and trend-based definitions of onset in both the control and EG eyes for a total of 11 SDOCT neural and connective tissue, CSLT surface ...

Purpose: To determine the relationship between total optic nerve axon counts and peripapillary retinal nerve fiber layer thickness (RNFLT) measured in vivo by spectral domain optical coherence tomography (SDOCT). Methods: Twenty-two rhesus macaques had three or more baseline measurements in both eyes of peripapillary RNFLT made by SDOCT (Spectralis, Heidelberg Engineering GmbH). Laser photocoagulation was then applied to the trabecular meshwork of one eye to induce chronic unilateral IOP elevation. SDOCT measurements of RNFLT continued approximately every two weeks until the pre-defined study endpoint was reached in each animal. At endpoint, animals were sacrificed and the optic nerve was sampled ...

The field of optical coherence tomography (OCT) has blossomed dramatically since some of the first work by various researchers around the world in the late 1980s and early 1990s. Since then there have been dozens of companies created, hundreds of research groups working on OCT, thousands of research articles published, millions of patients scanned with OCT, hundreds of millions of venture capital and corporate R&D dollars invested, hundreds of millions of dollars in company acquisitions, and billions of dollars of revenue created. The United States government and other governments around the world have been big supporters of funding for ...

Heidelberg Engineering has designed, manufactured and distributed diagnostic instruments for eye care professionals for 20 years. In celebration of this milestone the company held a two-day symposium in Heidelberg, Germany, demonstrating the integral part the company has played and continues to play in worldwide research and clinical practice. “Frontiers and controversies in structural and functional ocular imaging” featured a plethora of experts from all over the world discussing their research and results in imaging and diagnostics. In this supplement Ophthalmology Times Europe and Heidelberg Engineering present the highlights of the 20th Anniversary symposium.