Last Updated on
Corneal topography is a technological procedure designed for monitoring and measuring changes that might occur in the shape of the cornea of the eye. It can also be defined as the diagnostic tool-assisted by the computer o create a three-dimensional figure of the curvature surface of the cornea of the eye.
Have you ever been diagnosed with an eye complication? I guess nearly everyone at some points in life has been a victim of any single eye implication. However, that is not the issue here. At this time, several things occur in which some you know and some Yourdon know apart from the doctor you are dealing with.
Interestingly, you cannot diagnose any eye disease and be successful; why? This is because the doctor is not able o seeing everything that is happening on the eye. But this can only be done by using a corneal topography machine to help make the diagnosis.
What is Corneal Topography?
Have you ever been involved in any contact lens examination? If you have ever been in such a situation, I guess you have witnessed the doctor charging an extra fee that will carter for corneal topography. Then, what is this optical corneal topography that you are being charged extra cash for? I am going to provide you with detailed information on what it is all about. Thus, if next time you happen to be in the same situation, you are aware of what the doctor is charging you extra cash.
The cornea of the eye is known to be responsible for almost about seventy percent of the focusing power of the eye. This is because a sight that is normal regarding vision has typically an evenly rounded cornea. However, if the cornea is too flat, steep, or has an unevenly curved surface, there will be a result of a vision that is not perfect. Thus, here is when the doctor will charge you extra cash and take advantage of optical corneal topography as it is suitable for detecting such kind of changes if they are present in your eye. Thus, this is the most convenient test to be done.
Having known what the corneal topography is, what is this cornea we are emphasizing on? It is good to know what it is so that you have a beer understanding of identifying the defects that it might possess. Therefore, here is what cornea is as far as optometry is concerned.
It is a transparent dome-shaped tissue located in the eye, and it’s majorly known to be covering the iris and the pupil. Besides, it provides about two-thirds of the refracting power to an individual’s eye. It is made up of specialized cells, thus making it be a more remarkable tissue. However, it doesn’t have any blood vessel in it that can provide it with nourishment. Therefore, this makes it receive most of its food directly through the aqueous humor from the eye and the tears on the surface. However, it is not a defect if the cornea doesn’t have any blood vessel on it. This is because it is like a lens; thus, it needs to be transparent without any blood vessel that might interfere with the process of eye focusing.
How does Optical Corneal Topography Work?
Having known what a corneal topography is, it is also advisable that you be aware of how it works. Therefore, here I am going to explain to you how the system works to ensure that the topographer gets the full details from the cornea.
The optical corneal topography works by producing a detailed, visual description of the cornea shape and power. By working to provide this analysis, the doctor will be able to get excellent details about the cornea conditions and the corneal surface.
All these achievements are after a series of illuminated rings known as the calm disc projected on the cornea surface. These reflections are into the instrument. The computer then generates a topographical map of the cornea after the analysis of the mirrored rings has been done. After which, the details provided by the network can be useful in the diagnosis. This included monitoring and in the treatment of various conditions present in the eye. Besides, they can be used in contact lenses fitting, and even for planning for surgeries, including laser vision correction.
During the process of diagnosis, the patient seats in front of the bowl and head pressed against a bar when a series of data points generated. This is because; the optical corneal topography equipment has a computer that links to a lighted bowl that has a pattern of rings. These data points are then digitized by computer software to produce a printout of the corneal shape. Usually, To identify different elevations, different colors applied like how the topographic map of the earth displays that are always available on the land surface.
Knowing how the corneal topography works is a big plus, but the question is what these conditions shown on the computer are? You might have been asking yourself what they are, but don’t have to worry, here I am going to take you through the conditions shown into details. Therefore, below is what the optical corneal topography reveals during the diagnosis process.
Corneal topography is very useful because it provides a wealth of information on the eye on different areas as follows:
Keratometry: this is an older technology that was in use before the corneal topography developed. It used to measure only a small surface area of the cornea, thus giving the doctor only two measurements, that is the steepness of the cornea. But, the optical corneal topography technology revolutionizes the analysis of the corneal shape. Thus, instead of measuring only two points, it provides hundreds of data points of the cornea. These help to build a correct mapped color of the entire steepness of the eye in either location the doctor is interested in analyzing. The technology, therefore, reveals to the doctor how much astigmatism you have. This is by generating a color map that shows the steeper areas in reading and flatter areas that are in blue.
Elevation maps: the technology also reveals to the doctor the elevation maps. This will help the doctor to see the unusual spots on the cornea that are not the same as usual. Besides, some software is also developed to provide three-dimensional images that the doctor can be able to rotate in any direction they are interested in. This is to get a beer understanding of what might be occurring in the cornea.
Contact lens fitting: your doctor needs to watch you to detect the changes in your eyes to help in avoiding some of the severe complications. Therefore, this is where the optical corneal topography comes in because it helps the doctor to determine the exact lens that can feet you. This is by revealing the precise shape of your cornea.
Dry eye evaluation: the corneal topography reveals precisely how the surface of your eye is rough and at the same time how your vision is being affected by a dry eye. This is because the tears on the eye are very complex; thus, it cannot be straightforward to identify any complication in the eye using a microscope directly.
Optical Corneal Topography Benefits
Corneal topography is not a routine test as the majority of the people thinks; however, its application is in the diagnosis of specific implications. Apart from this, its form is in the evaluation of disease progression, contact lenses fitting, and surgery planning. However, the technology commonly employed in refractive eye surgeries. Besides, the map produced by the device is used together with other tests to determine how much the corneal tissue can be removed to correct the visual defect.
In the diagnosis and management use of the optical corneal topography, specific abnormalities and diseases that are dealt with are not limited to the following:
- Corneal transplants
- Corneal opacities
- Corneal deformities
- Fitting contact lenses
- Planning for refractive surgeries
- Irregular astigmatism following the corneal transplantation.
Having known the uses of the corneal topography, it is also good to know its benefits. Therefore, below are its benefits that you may need to know:
Here are the benefits of an optical corneal topography that you may need to know
- It retains patients
- The specialty lens wearers usually produce more substantial profits
- The specialty wears are very loyal
- Several specialty lenses candidates exist
The Latest Corneal Topographer in Ophthalmology
Health and technology directly related to each of them depend on each other. Why am I saying this? When it comes to health problems, especially those associated with the eye, you need assistance to make some treatments. The eye is a very delicate structure among the body organs, and thus, it cannot just approach in the same way other organs are approached. As a result, the scientist has come up with many devices that have been helping in diagnosing and managing the implications in the eye. To add, they have been working hard on how they can improve these devices daily to ensure that all details or any changes on the eye provided. As a result, optical corneal topography is one of the tools that have been in use over decades in eye problems diagnosis. This device has been of benefits to the doctors who specialize in eye treatments. Because of this, some corneal topographers have emerged in the ophthalmology. Therefore, below is some of the latest optical corneal topography in the ophthalmology:
Oculus easygraph offers the ideal solution o those practices that struggle with space limitation. It, therefore, incorporates the assessment of the cornea directly into the process of examination by mounting directly on the slit lamp. Its design uses the same precise measuring technology as that of keratograph. However, it is both a topographer and a keratometer that has been combined to become a unit. Besides, it also has numerous analysis and formats that are displayed to provide support in the quantitative classification of the cornea. Using an Oculus easy graph, contact fitting lenses that are available can also be integrated to add confidence and enhance trust among the contact lens consultants.
Galilei g4 integrates placid disc topography with the scheimflug topography as a single device. It allows for the analysis of both anterior and posterior surfaces of corneal. This makes the recorded dual-scheimflug images to produce a reliable pachymetry with posterior curvature data. But, the calm generates high quality and central corneal curvature data fitted to the anterior corneal surface.
Cassini corneal helps in cataract surgeons to better understand the corneal properties. Thus, this helps in improving the outcomes and increasing premium patient volume. It is a first of its kind anterior segment ocular device used in diagnosis based on the color led technology. Besides, it also enables superior diagnosis for corneal astigmatism, analysis for dry eye, contact lens fitting, planning for refractive cataract surgery, and corneal transplant.
Topcon ca-200f is a reasonably based topography system designed to deliver accurate and images with a higher resolution of the anterior corneal surface. The twenty-four rings on it measure up to about ten thousand data points. It also incorporates eight blue led’s required for fluorescein images. These are essential for the simulation of contact lenses. The advantage part of it is that it can be operated as a single stand unit or in combination with other external pcs. To make the operation and evaluation of the cornea fast and easy, you can use the combination of a ten-inch touch screen with a high-speed CCD camera. This has an auto capture and best features of an image.
The orbscan three is from the Bausch + Lomb as an anterior segment analyzer and the third generation of the multidimensional orbscan topographer. It is a new platform that has several features that have many enhancements driven by more than twenty years of use in the field. It serves as an indispensable tool for screening to increase the number of ophthalmic surgeons with new refractive guidelines.
Tracey iTrace Combines, autorefraction, corneal topography, auto-keratometry, wavefront aberrometry, and pupillometry in one system. Tracey itrace technology enables the trace users o objectively see what the patients see with a total quality of visual assessment. It also increases the user’s confidence in vision analysis, especially in stressful situations. This is due to its high accuracy, state of the art diagnosis information that improves efficiency while reducing the occurrence of mistakes.
Reichert ocular response analyzer (ora) g3 is the only tonometer that measures corneal hysteresis that is a superior predictor of glaucoma progression. Hysteresis of corneal is an indication of the biochemical properties. It shows how the cornea differs from the topography that is geometrical attributes.
Zeiss atlas 9000 is a perfect system for the most significant products of the corneal data points. It analyzes several images during the alignment and selects the image with higher quality. Besides, it helps in streamlining the fitting of gas permeable lenses and provides a guide on how to go through difficulty and specialty fittings.
9. Opd scan iii
Opd scan iii is a third generation combined aberrometer and a corneal topographer in the market. It is faster, accurate, and user-friendly than the others that were initially in the market, that is the old-scan ii. This combination, therefore, offers eye care practitioners with versatility as a single unit. Thus, Opd scan iii provides broad information on the eye. This enhances comprehensive analysis and assessment depending on the model used.
Tomey tms-5 automatically captures several slices by focusing the light alignments on the center of the cornea as it is in the ring topography. In action, it can take about half to one second, which is like the measurement time of ring topography.
Is Corneal Topography worth for your eye clinic?
Because you cannot be able to see or diagnose your eye by yourself, the corneal topography is suitable for the eye clinic. This is because; it will perform an analysis of all the changes that are present on the surface of the cornea of your eye. This makes it easy for the doctor to carry out treatment and prescribe drugs to use based on the data points from the optical corneal topography.
An eye is a very delicate tissue within the living organisms. This means that it requires a lot of care and monitoring. However, when I come to the treatment of the eye, some changes cannot be detected by the naked eye. This means that there are tests that must be done to ensure that the procedure is done based on what is present or found occurring on the eye. Therefore, this is where the corneal topography technology comes in. This helps in making diagnosis and management of the eye. Besides, it also provides the doctor with details that might be required. From the discussion above, it is clear that optical corneal topography has a very high significance when it comes to eye care management.
Ophthalmicmart blog supports your practice by providing professional perspectives, educational editorials and articles relevant to the profitable advancement of Ophthalmic practice or your practice and will upgrade advice.
Latest posts by Soren Milano (see all)
- Revealing the Retina: Optometry Corneal Topography - February 12, 2019
- Everything You Need to Know About Optical Coherence Tomography - December 2, 2018
- Optometrist diagnostic equipment in the diagnosis and detecting of glaucoma - October 19, 2018