Corneal Topography
The cornea is the transparent layer located in front of the colored part of the eye and has refractive properties. Topography is a diagnostic method that provides information about the structure of the cornea. No prior preparation is required for Corneal Topography, and it is used to evaluate the front and back surfaces of the cornea with a simple method.
It allows the creation of a corneal map in the form of rings that shows the curvature, refractive power, and thickness of the cornea. As the steepness of the cornea increases, the colors in the map shift towards red, which always has an alerting feature.
During this measurement, various formulas are used to measure the front and back surfaces of the cornea, corneal thickness, anterior chamber depth, corneal diameter, and corneal refractive power. It is an important diagnostic method used before various eye surgeries, including cataract, intraocular lens placement, and particularly corneal surgery.
Corneal Topography is Most Commonly Used for the Following Purposes:
- Before and after refractive surgery
- Early screening of suspected keratoconus is one of the most useful roles of topography.
- Measuring astigmatism after surgery, cataract surgery, and corneal transplant operations, selective suture removal, and planning other interventions.
- The effect of corneal and ocular surface disorders: Conditions like pterygium (winged eye), limbal dermoid cyst, and localized corneal scars can cause changes in corneal topography, making monitoring very useful.
Other uses: Contact lens placement in keratoconus, corneal incision placement, and intra-corneal ring placement.
Visual Field Test
What is Computerized Visual Field?
The visual field, also known as perimetry, means the peripheral field examination. It is particularly used in glaucoma and retinal diseases.
It is also used in the early diagnosis of various neurological diseases such as brain tumors, brain hemorrhages, and pituitary tumors for diagnostic and monitoring purposes.
In ophthalmology, the most significant disease causing peripheral visual field loss is glaucoma or ocular hypertension. This disease usually starts after the age of 40 and progresses without causing central vision loss.
In daily life, people do not pay attention to their peripheral vision and use their central vision, which constitutes about 90% of their visual acuity. Therefore, they do not notice the initial peripheral vision losses.
If the disease is not treated, peripheral vision losses will continue to progress, and when they approach the center, the person may notice visual field narrowing. However, this is the late stage of the disease, and visual field losses are irreversible.
In summary, if glaucoma is diagnosed early, its effects on the optic nerve and visual field losses can be prevented with regular doctor follow-ups and various protective treatment methods (eye drop treatment, laser, and surgical techniques).
Amsler Grid Test
Do you have AMD (Age-related Macular Degeneration)? Save your vision with the Amsler Grid
If you have macular degeneration, a simple routine lasting less than a minute can help you save more of your vision
Age-related macular degeneration (AMD) is a disease that affects the small part of the retina called the macula. The macula provides you with central vision. For example, it helps you recognize a person’s face, thread a needle, or read the time on a clock or the screen of your phone.
The most common form of AMD is known as the “dry” type. Dry AMD can later turn into the “wet” type. In this disease, vision loss is more severe and more rapid.
In people with AMD, vision usually declines slowly, so they may not be aware of how much vision they have lost.
Therefore, an Amsler grid test is given to patients to check their eyes at home. Using this test, it is possible to detect any visual changes (such as the bending and distortion of straight lines: Metamorphopsia) that are not obvious and might not be noticed in daily life.
