OCT Systems:

OCT Systems

How Optical Coherence Tomography Works & How We Save You Time & Money

Excedr - OCT Systems

Excedr can source virtually all instrument types and accommodate any brand preferences you might have. Request an OCT system lease estimate today and see how leasing can discount your ophthalmic system’s price.

All equipment brands/models are available

The Advantages of Excedr’s OCT Leasing Program:

  • Eliminates the upfront cost of purchasing equipment by spreading its cost over time
  • Minimizes equipment downtime with included complete repair coverage and preventive maintenance
  • Takes advantage of potentially 100% tax deductible* payments, providing you significant cash-savings
  • Expedites the administrative work needed for instrument procurement and logistics
  • Conserves working capital,  enabling you to reinvest in your core business and operations (staffing, inventory, marketing/sales, etc.)
  • Accommodates all manufacturer and model preferences

*Please consult your tax advisor to determine the full tax implications of leasing equipment.

Eye care professionals use optical coherence tomography (OCT), an optical tomographic imaging technique, to perform non-invasive, high-resolution imaging of the macula, cornea, and optic nerve using an OCT machine. 

OCT imaging is used for both the anterior and posterior segments of the human eye. The mechanisms of these systems are similar to an ultrasound, however, light waves are used instead of sound waves. 

OCT systems obtain an in vivo cross-sectional image by performing many one-dimensional scans at several different imaging depths, using near-infrared or infrared light, which can be translated into a volumetric image of the retina or cornea.  

Next, a 3D image is generated using these scans. This allows an ophthalmologist or optometrist to map and measure every distinct layer of the retina or cornea, providing valuable information that helps with diagnosis and analysis of structural change in the eye as diseases progress. 

Performing an OCT scan can identify retinal diseases, such as diabetic retinopathy and age-related macular degeneration, which can cause macular edema, the build-up of fluid in the middle of the retina. Optical coherence tomography is also capable of evaluating optic nerve disorders that include glaucoma, Alzheimer’s disease, and optic neuritis. 

AS you can see, retinal imaging is incredibly important in measuring eye health, and it is critical to provide a full picture. Without proper eye scanning, vision-threatening diseases can go unnoticed or untreated. 

To protect your patient’s vision, and to perform detailed, in-depth procedures, an OCT system should be used. It is evolving to become one of the most important diagnostic tools in ophthalmology biomedical research, and has continued to contribute to the understanding of retinal pathology and improvement of monitoring progression and treatment in diseases of the posterior and anterior segment of the eye.

OCT Systems Technology, Benefits, & Applications

As an imaging modality, OCT relies on two types of technology to perform accurate and sensitive scans: Time-domain OCT (TD-OCT) and Fourier-domain OCT (FD-OCT). There are some variations of FD-OCT that we will cover as well that are widely used in ophthalmology.


Time-domain OCT, also referred to as TD-OCT, has been used since the introduction of optical coherence tomography, but has more recently been replaced by spectral-domain OCT.

It is capable of acquiring approximately 400 one-dimensional scans per second, using six different radial slices that are oriented around 30° apart. It relies on the movement of a mechanical arm to capture axial scans.



Fourier-domain optical coherence tomography (FD-OCT) is based on low-coherence interferometry. This type of interferometry utilizes the coherent properties of a light source with broad optical bandwidth to measure optical path length delays coming from a sample.

Cross-sectional images are obtained by using a coupler to split the light of the low coherence source into two different paths, which are then measured using an interferometer, which measures the optical path length differences seen between the light via a sample arm and a reference arm.

There are two types of FD-OCT systems, which utilize different light sources and detection devices: spectral-domain OCT (SD-OCT) and swept-source OCT (SS-OCT).



Spectral-domain OCT, or SD-OCT, provides more speed and efficiency than time-domain technology, performing quicker acquisition rates and greater resolution. SD-OCT, as a term, can be used to refer to Fourier domain OCT. However, SD-OCT is known as a variation of FD-OCT.

It is able to execute approximately 20,000-40,000 one-dimensional scans per second, which decreases the potential for missing a scan of any part of the eye due to blinking or other instances of patient movement.

SD-OCT devices and systems are commonly used to evaluate vitreous, retinal and choroidal pathology.



SS-OCT, short for swept-source OCT, is a newer generation of OCT, offering higher speeds, increased spectral resolution, and better signal-to-noise ratio (SNR) than SD-OCT. Because of its speed, SS-OCT can reduce motion artifacts, and in some cases avoid them entirely, especially in ophthalmic or cardiologic applications, offering better imaging capabilities than the previous generations of OCT.

Furthermore, SS-OCT provides comprehensive imaging of larger hollow organs, which enables wide-field imaging for the detection of early and subtle morphological tissue changes over a larger field of view than SD-OCT.

SS-OCT system components differ from SD-OCT in numerous ways, namely the light source, optics, and detection device. While SD-OCT utilizes a broadband, low-coherence light source, SS-OCT relies on swept-source, a type of tunable laser light source that has a tightly focused wavelength which sweeps across a narrow band of wavelengths.

In SS-OCT, the sweep is capable of labeling different time delays that are detected by interference, which are then measured by a point photodetector as the light waves return to the device, resulting in faster scanning speeds. SD-OCT elies on a spectrometer, diffraction grating, Fourier transform lenses, and a detector array instead to detect these returning wavelengths.

Issues with data transfer during OCT have been addressed through SS-OCT by employing two dual-balance digital detectors in sequence , which has enabled continuous real-time imaging.



OCT angiography, or OCT-A, another variation of OCT, provides eye care professionals with another way to treat retinal conditions and diseases. It provides noninvasive label-free visualization of microvasculature of the retina and choroid. Imaging microvasculature is critical for diagnosing retinal conditions, because they can host all-important indicators of the disease and its progression. For example, cancerous tumors often rely on vasculature to feed their growth.

OCT-A uses laser light reflectance of the surface of moving red blood cells to accurately depict vessels through different segmented areas of the eye, thus eliminating the need for intravascular dyes.


Ease-Of-Use & Scanning Speed

The full picture of a patient’s eye health is paramount, and OCT machines provide vital data that can give your patients the peace of mind they deserve. But, these systems can be complicated to operate.

To make operating them easier, manufacturers have developed machines that offer one-touch and auto-alignment features, providing hands-free diagnosis. By simplifying the process, automation cuts down on waste and increases overall accuracy of the results.

Additionally, imaging speed is one of the most important parameters for OCT quality and efficiency. This is because high scanning and data acquisition speeds enable the reduction of motion, such as breathing and eye movements, that can impact an OCT scan. High speeds also help with field of view, providing wide-field imaging, and can even pick up morphologic changes that are often too subtle to catch with slower systems.

Because of all this, OCT systems have been developed to provide high-speed scanning capabilities, which have been closely linked to developments in OCT light sources, such as wavelength-swept lasers. These swept sources, as they’re often referred to, provide different sweep ranges that affect the speed at which a scan can be performed, as well as the axial resolution in OCT.


Optical Coherence Tomography System Leases to Fit Every Need

If acquiring a piece of optical imaging equipment outright for your eye clinic poses some financial hurdles, consider leasing.

We provide an alternative to burdensome prices by offering an extensive ophthalmic equipment leasing program that spreads payment out over time, covers unexpected repair and maintenance costs, and provides multiple end-of-lease options. Reach out today to learn more about leasing an OCT system.

Operating Lease

This off-balance sheet financing structure provides three options at the end of the term. The lessee has the option to return the equipment to the lessor, renew at a discounted rate, or purchase the instrument for the fair market value. Monthly payments are also 100% tax deductible which yields additional monetary savings.


If you recently bought equipment, Excedr can offer you cash for your device and convert your purchase into a long-term rental. This is called a sale-leaseback. If you’ve paid for equipment within the last ninety days, we can help you recoup your investment and allow you to make low monthly payments. This also frees up money in your budget rather than tying it down to a fixed asset.

OCT Manufacturers & Models
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Leica Microsystems:
EnFoucs, Envisu R-Class, Envisu C-Class

Topcon Healthcare:
Maestro2, Triton™

CIRRUS 500/5000, CIRRUS photo, CIRRUS 6000, PRIMUS 200

RS-3000 Advance 2, Retina Scan Duo™ 2, Mirante SLO/OCT

Luneau Technology:
Optovue iVue80, iFusion80, iScan80, AngioVue, Avanti Widefield

Heidelberg Engineering:
Spectralis, OCT Spectralis, HRA + OCT Spectralis, HRA Spectralis

Optopol Technologies & OPTOPOL USA:

OPTIS™ Imaging Systems


Operating Capital Benefits

Operating Capital Benefits

Excedr's operating lease structure allows you to keep your business credit line open for expansions, staffing, and other operational expenses. Additionally, it strengthens the cash flow of your business and keeps cash reserves free for business development opportunities.

Effects on Credit

Effects on Credit

Leasing / renting provides you with non-dilutive financing and does not hinder your future borrowing ability. You're able to acquire the equipment you need without the baggage associated with traditional financing.

Speed of Approval

Speed of Approval

Excedr's program allows you to respond quickly as your need for equipment and technology arises. You can be approved with minimal documentation and have the equipment you need in operation and generating revenue for your business quickly.

Refurbished Equipment

Refurbished Equipment

Unlike traditional financing and leasing companies, the Excedr program can accommodate refurbished equipment in addition to demo units. If you are looking for additional cost-savings, we recommend considering this option.