How Corneal Topography Works & How We Save You Time & Money
Excedr’s leasing program can source virtually all instrument types and accommodate any brand preferences you might have. Request a corneal topographer lease estimate today and see how leasing can adjust your ophthalmology equipment’s price.
All equipment brands/models are available
The Advantages of Excedr’s Corneal Topographer 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.
Corneal topography is a specialized and non-invasive imaging technique used in ophthalmology and optometry to analyze the cornea—specifically the anterior curvature.
It is just one of the computer-assisted technologies used in corneal imaging, which eye care professionals rely on to characterize the curvature of the cornea, or the out structure of the eye.
Using corneal topography, ophthalmologists and optometrists can create a detailed three-dimensional map of the anterior and posterior corneal surfaces, which can show irregular conditions of the cornea which would otherwise be invisible with more conventional testing techniques.
The cornea is incredibly important, being responsible for over two-thirds of the eye’s optical power. Its topographic properties are critical in determining cornea health and overall sight. If the corneal shape is too flat, too steep, or has an uneven curvature, the quality of that person’s vision will be affected.
Corneal topography, along side other corneal imaging techniques, such as corneal tomography, can map these abnormalities or conditions and provide eye doctors with very fine details regarding the condition of the corneal surface. These detailed topographic maps are used to diagnose, monitor, and treat various eye conditions, as well screen patients for surgical procedures.
Corneal topography is also referred to as photokeratoscopy or videokeratography, and is performed using a corneal topographer.
Ophthalmologists and contact lens specialists can use the topographer in numerous ways. For example, this diagnostic tool can be used for contact lens fitting by allowing eye professionals to assess the surface of the cornea prior to fitting contact lenses, observe how the lens fits the cornea, evaluate the shape of the cornea after the lens is placed on it, and track the contact lens as it wears in relation to the patient’s vision.
Eye professionals can also use the device to evaluate and plan for refractive surgeries, as well as cataract surgeries. A topographer can determine how much corneal tissue needs to be removed for successful laser vision correction, which may also include photorefractive keratectomy, or PRK, a gentler cousin of Lasik surgery.
Furthermore, the topographer may be used postoperatively to assess how much the surface of the cornea has changed. Post-cataract surgery and post-keratoplasty corneal astigmatism can be managed using a topographer by studying the results of surgery on the cornea. Suture removal and other types of interventions can be planned using the information obtained through corneal topography.
However, one of the corneal topographer’s most useful functions is to evaluate and diagnose corneal diseases or conditions like keratoconus, Fuch’s endothelial dystrophy, bullous keratophy, and dry eye, as well as corneal scars or aberrations.
Topographer Imaging Techniques, Types, & Price
Topographers use different techniques to achieve specific results, depending on the type of map that needs to be generated. Devices will either operate on their own or in combination with one another.
This technique projects a concentric ring-shaped light onto the surface of the cornea, capturing the reflected light in order to measure curvature, irregularities, and other physical characteristics of the cornea.
The tear film, a combination of three layers that protects and lubricates the eye, reduces risk of infection, washes away foreign particles, and keeps the surface of the eye smooth and clear, is the main part of the ocular surface that actually reflects light. Placido disc reflection, also known as placido disc topography, relies on the tear film to measure all these characteristics.
This system can be categorized into two groups: small-cone and large-cone. Small cone systems are more accurate, but large-cone systems can be easier to manipulate, which in turn makes data collection easier.
This is a modern anterior segment imaging technique that involves the Scheimpflug principle. The three-dimensional quality of the cornea can lead to incorrect test results. Based on this principle, distortions in perspective of the image generated by a topographer can be corrected.
Ideally, when taking a photograph, the lens plane and image plane are parallel, meaning a linear object can line up directly with the lens and image plane, creating an image that is in full focus. However, if an object is not parallel to the image plane, it will be more difficult to get an image that is in full focus, which can lead to image distortion.
According to the Scheimpflug principle, drawing an oblique tangent from the image, object, and lens plane can create an intersection point referred to as a Scheimpflug intersection. This orientation can allow for manipulation of the image and lens plane, bringing the non-parallel object into sharper focus.
In short, a rotating camera is used to photograph corneal cross-sections illuminated by slit beams at different angles.
Another anterior segment imaging technique, scanning slit topography directly measures the elevation of the anterior and posterior segments of the cornea through time-domain or light based analysis. By processing several different points of elevation on the corneal surfaces, data can be collected according to position. This data is then turned into measurements of curvature and thickness.
Benefits of Topography
Corneal topographic mapping is an important diagnostic tool for any ophthalmologist whose clinic monitors patients ocular diseases, disorders, and conditions. Capable of a huge variety of clinical uses, these devices are invaluable to any ophthalmologist who perfects the fitting of contact lenses, performs refractive surgeries, assesses post keratoplasty corneal astigmatism, and detects corneal pathologies.
Corneal Imaging System Leases to Fit Every Need
Corneal curvature and power can be measured using corneal topography, and play an important role in our overall vision.
Ophthalmologists not only can properly fit patients with contact lenses, but they can also track disease, inform treatment and monitor efficacy over time, and screen patients for surgical procedures. These numerous capabilities make corneal topographers essential to ophthalmology and optometry.
Although acquiring new ophthalmic equipment is oftentimes difficult due to burdensome upfront costs, there is an alternative. We offer a comprehensive leasing program that spreads payments out over time, helping keep your access to daily financial needs unencumbered.
Keep more cash on hand and save time you’d spend on equipment procurement for helping patients. Contact us today to learn more about leasing a corneal topographer.
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.
Corneal Topographer Manufacturers & Models
Topcon Medical Systems, Inc.:
CA-800 Corneal Analyzer, Aladdin HW 3.0
TMS-4N, RT-7000 Multifunctional Auto Ref/K/Topo
Keratograph 5M, Keratograph 4, Easygraph, Pentacam, Pentacam HR, Pentacam AXL
WaveLight Topolyzer VARIO
ATLAS 9000 Corneal Topography System
OPD-Scan III Wavefront Aberrometer
Cassini Connect, Cassini Ambient