How Slit-Lamps Work & How We Save You Time & Money

Excedr - Slit Lamps

Excedr’s lease program can source all instrument types and accommodate any brand preferences you might have. Request a slit lamp estimate today and see how leasing can discount your instrument’s price.

All equipment brands/models are available

The Advantages of Excedr’s Slit Lamp 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.

In ophthalmology, being able to clearly look into a patient’s eyes is absolutely vital to properly diagnosing their ocular health overall.

Ophthalmologists and optometrists use what’s called a slit lamp to perform detailed eye exams that can provide vital insight into the state of a patient’s sclera, cornea, eye lens, retina, and optic nerve.

Slit lamps can even be used to observe the whole fundus. Using a specialized microscope and high-intensity light source, the operator can examine the various areas of the human eye with ease, areas that are located in both the anterior segment and posterior segment.

Besides monitoring the overall health of the front and back of the eye, slit lamp exams are also used to diagnose many types of ocular diseases or abnormalities, such as myopia, presbyopia, and keratoconus.

Slit-lamp examinations begin with the seated patient placing their chin on the chin rest. The ophthalmologist or optometrist then administers fluorescein, a fluorescent dye to make observing the eye easier, and may even occasionally dilate the patient’s pupils using dilating drops. 

Light sources and the biomicroscope are then adjusted to view the various parts of the patient’s eye. The physician will sweep the light source across the areas of the eye that they need to observe to diagnose any issues or anomalies.

In slit lamp biomicroscopy, the two main types of set-ups differ based on where the illumination source is located. The light source can be positioned either below the microscope or above it. 

The illumination sources of slit lamps can vary depending on what the optometrist wishes to see, the condition of the eye, or if the physician is looking for a specific defect. Additionally, filters are also used to make it easier to see specific things in the eye. 

There are six common illumination types:

  1. Diffuse illumination
  2. Direct focal illumination
  3. Specular reflection
  4. Transillumination or retroillumination
  5. Indirect lateral illumination
  6. Sclerotic scatter

Without proper eye care, people with vision problems are more likely to see their vision deteriorate. As an ophthalmologist, having the proper eye examination equipment is vital to your patients ocular health. We cover some of the eye diseases slit lamps detect, as well as the techniques and uses for these instruments.

Eye Diseases, Techniques, and Slit Lamp Uses


Glaucoma is a term used to describe a group of eye diseases that can damage one’s eyes. Common types include closed-angle glaucoma, normal-tension and open-angle glaucoma. Often associated with a buildup or abnormally high intraocular pressure, glaucoma affects over 3 million Americans and is a leading cause of blindness in people over 60.

People who suffer from many different forms of glaucoma show no warning signs and the effects can manifest themselves so gradually that patients may not notice the changes in their sight until it becomes severe. Optometrists and ophthalmologists use slit lamps to look for warning signs in patients’ eyes to diagnose glaucoma.



As a person ages, their eyesight may diminish and become cloudy. Though age-related diminished eyesight can be natural, reduced sight may also be caused by a buildup of protein in the lens of the eye.

This build up is referred to as a cataract and if untreated they prevent light from passing through your eye clearly causing distortions in your vision. In some cases the patient’s vision may be improved by performing cataract surgery to remove the excess protein.

Though age is the most common cause of cataracts they can also be caused by trauma or secondary medical and physical conditions. By using a slit-lamp, doctors are able to examine the eye’s lens and determine if a cataract is causing a patient’s vision to be altered.



The cornea of the eye is the part that covers the iris, pupil, and anterior chamber. It is the transparent, protective outer layer of the eye that protects it from foreign debris.

The cornea can become thin and eventually begin to bulge outwards in a cone-like shape. This phenomena called keratoconus, can lead to blurry or distorted vision and light sensitivity.

In some extreme cases of keratoconus, scarring can form around the cornea. Slit lamps are a common tool used in the diagnosis and examination of patients with keratoconus. The normal treatment for this is the use of corrective lenses such as glasses or soft and hard contact lenses. A few extreme cases will require corneal transplant or keratoplasty to repair the patient’s vision.


Helmholtz & the Augenspiegel

Hermann Ludwig Ferdinand von Helmholtz after whom the famed Helmholtz Association is named after, was a German physician and physicist. His work has helped us better understand what “vision” really means as well as our general knowledge about how eyes work.

While working as a professor of physiology, Helmholtz wanted to show his students why the pupil appears black most of the time but occasionally would change color. It was in 1851 when Helmholtz would invent the Augenspiegel, or the eye mirror.

Before the eye mirror, people were not sure what was behind the pupil. Many theories existed at the time, as to why our pupils appear black in the day but sometimes at night appear brighter.

An odd phosphorescent phenomena, bioluminescence, the emission of light that had been absorbed over the entire day, are just some of the theories of the day. The eye mirror would be improved upon becoming what is today known as an ophthalmoscope.

The field of optometry has grown significantly since 1851 and more tools and techniques exist that have helped us better understand how the eye works. Slit-lamps, keratometers, indirect ophthalmoscopes, and pupilometers are just a few examples of how Helmholtz’s eye mirror evolved over time.

There is some debate as to whether or not Charels Babbage should be given more credit for inventing the ophthalmoscope; however, Helmholtz’s contribution to its creation and usefulness are undeniable.


Slit Lamp Leases to Fit Every Practice’s Needs

Like David Byrne, eye specialists are interested in looking into the eyeball, and slit-lamp instruments offer exactly that, making them essential to any optometry and ophthalmology practice. 

Your patients’ eye health is paramount, and you should not have to compromise on equipment quality because of price. Whatever brand, make, or model of slit lamp you need, Excedr can lease it to you, helping you save money on upfront costs and time dealing with procurement.

If you have an idea of what you’d like to lease, request a lease estimate and we’ll be in touch as soon as possible.

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.

Slit Lamp Manufacturers & Models
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Zeiss SL 115, Zeiss SL 120, Zeiss SL 220, Zeiss SL 130, Zeiss SL 800

Reichert Technologies:
Xcel® 455, Xcel® 255, PSL Portable Slit Lamp

Topcon Healthcare:
D Series Digital Ready Slit Lamps, SLD-2, SLD-4, SLD-301, SLD-701, G Series Slit Lamps, SL-2G

Haag-Streit USA, Inc.:
BM 900, BI 900, BP 900, BQ 900, BX 900

Kowa Medical:
KOWA SL-17 Portable Slit Lamp, SL-15L

Lumenis 980, Lumenis 1000, Lumenis 990, SL 130,

Ultra M5 Slit Lamp, Ultra M4, Ultra M3, Ultra M2, B2 Slit Lamp, B3

Nidek, Inc.:
Slit Lamp SL-1800, SL-2000, SL-450, SL-250


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.