Corneal topography, also known as photokeratoscopy or videokeratography, is a non-invasive medical imaging technique for mapping the surface curvature of the cornea, the outer structure of the eye. Since the cornea is normally responsible for some 70% of the eye’s refractive power, its topography is of critical importance in determining the quality of vision.
The three-dimensional map is therefore a valuable aid to the examining ophthalmologist or optometrist and can assist in the diagnosis and treatment of a number of conditions; in planning refractive surgery such as LASIK and evaluation of its results; or in assessing the fit of contact lenses. A development of keratoscopy, corneal topography extends the measurement range from the four points a few millimeters apart that is offered by keratometry to a grid of thousands of points covering the entire cornea. The procedure is carried out in seconds and is completely painless.
Digital Retinal Imaging & OCT Scans
We use cutting-edge digital imaging technology to assess your eyes. Many eye diseases, if detected at an early stage, can be treated successfully without total loss of vision. Your retinal Images will be stored electronically. This gives the eye doctor a permanent record of the condition and state of your retina.
This is very important in assisting your Optometrist to detect and measure any changes to your retina each time you get your eyes examined, as many eye conditions, such as glaucoma, diabetic retinopathy and macular degeneration are diagnosed by detecting changes over time.
The advantages of digital imaging include:
- Quick, safe, non-invasive and painless
- Provides detailed images of your retina and sub-surface of your eyes
- Provides instant, direct imaging of the form and structure of eye tissue
- Image resolution is extremely high quality
- Uses eye-safe near-infra-red light
- No patient prep required
Digital Retinal Imaging
Digital Retinal Imaging allows your eye doctor to evaluate the health of the back of your eye, the retina. It is critical to confirm the health of the retina, optic nerve and other retinal structures. The digital camera snaps a high-resolution digital picture of your retina. This picture clearly shows the health of your eyes and is used as a baseline to track any changes in your eyes in future eye examinations.
Optical Coherence Tomography (OCT)
An Optical Coherence Tomography scan (commonly referred to as an OCT scan) is the latest advancement in imaging technology. Similar to ultrasound, this diagnostic technique employs light rather than sound waves to achieve higher resolution pictures of the structural layers of the back of the eye. OCT measures the thickness of the retinal nerve fiber layer and gives information about potential damage caused by glaucoma.
A scanning laser used to analyze the layers of the retina and optic nerve for any signs of eye disease, similar to a CT scan of the eye. It works using light without radiation, and is essential for early diagnosis of glaucoma, macular degeneration and diabetic retinal disease.
With an OCT scan, doctors are provided with color-coded, cross-sectional images of the retina. These detailed images are revolutionizing early detection and treatment of eye conditions such as wet and dry age-related macular degeneration, glaucoma, retinal detachment and diabetic retinopathy.
An OCT scan is a noninvasive, painless test. It is performed in about 10 minutes right in our office. Feel free to contact our office to inquire about an OCT at your next appointment.
Visual Field Testing
A visual field test measures the range of your peripheral or “side” vision to assess whether you have any blind spots (scotomas), peripheral vision loss or visual field abnormalities. It is a straightforward and painless test that does not involve eye drops but does involve the patient’s ability to understand and follow instructions.
An initial visual field screening can be carried out by the optometrist by asking you to keep your gaze fixed on a central object, covering one eye and having you describe what you see at the periphery of your field of view. For a more comprehensive assessment, special equipment might be used to test your visual field. In one such test, you place your chin on a chin rest and look ahead. Lights are flashed on, and you have to press a button whenever you see the light. The lights are bright or dim at different stages of the test. Some of the flashes are purely to check you are concentrating. Each eye is tested separately and the entire test takes 15-45 minutes. These machines can create a computerized map out your visual field to identify if and where you have any deficiencies.
YAG Laser Posterior Capsulotomy After Cataract Surgery
The most common complication of cataract surgery is clouding of the part of the lens covering (capsule) that remains after surgery, called posterior capsule opacification. If the cloudiness affects your vision, you may choose to have laser surgery called Nd: YAG posterior capsulotomy to correct this problem.
The doctor will apply topical anesthetic (eyedrops) so that you won’t feel pain. Then he will use a laser (Nd: YAG laser) to cut a hole in the clouded back lining of the lens capsule. This allows light to pass through the membrane to the retina at the back of the eye.
What To Expect After Surgery
Nd: YAG laser posterior capsulotomy is an outpatient procedure. The person may wait in the outpatient surgery area or the doctor’s office for 1 to 2 house after the procedure so that he or she can have the pressure in the eye (intraocular pressure) checked. You should not feel pain after the surgery.
Why It Is Done
After cataract surgery, some people notice cloudiness (sometimes called after-cataract) after several months or years. In some people, it can become very dense and cause as much or more vision loss as the original cataract.
The decision to have this procedure is based on the same criteria as the decision to have the original cataract surgery:
- Vision problems are affecting your work or lifestyle
- Glare caused by bright lights is a problem.
- You cannot pass a vision test required for a driver’s license.
- You have double vision.
- The difference in vision between your two eyes is significant.
- You have another vision-threatening eye disease.
The most common complication of Nd: YAG laser posterior capsulotomy is short-term increased pressure inside the eye. You may need to use eyedrops to lower the eye pressure.
Other risks include:
- Detachment of the nerve layer at the back of the eye (retinal detachment)
- Swelling of the center of the retina (macular edema)
- Damage or displacement of the intraocular lens
- Bleeding into the front of the eye
- Swelling of the clear covering of the eye (corneal edema)
What To Think About
It is common to have a new floater in the eye after this surgery.
Nd: YAG laser posterior capsulotomy is not used to prevent clouding of the back lining of the lens capsule (posterior capsule opacification). There is no way to know who will get clouding in the back of the eye after cataract surgery. Certain lenses used in the surgery to remove the cataract may lower this risk and the need for laser surgery later.
As with cataract surgery, it is important to weigh the risks and possible benefits of laser capsulotomy before deciding to have the surgery.
Thank you to WebMd for the above information.