How does the Simple Lasik laser procedure work?
All vision disorders for which glasses have to be used are measured in terms of sphere, cylinder or a combination of both. The best-corrected vision is termed 6/6 or 20/20. In simple Lasik, the sphere and cylinder power of a person eye is fed into the memory of the laser machine, and the laser then corrects the error. This means that the pattern for correction of myopia of -2.0 will be the same for all individuals with this error, irrespective of any person to person eye variations.
How is C-Lasik laser performed?
Lasik involves extensive computer analysis of the eye. The optical data of an eye is collected with help of an aberrometer. This data is further processed with a final fit program in another computer and then transferred to the laser machine. The laser machine is equipped with scanning slit and spot delivery system to handle such treatments. The spectacle user is then asked to come on the scheduled day for the laser treatment. Local anesthetic eye drops are instilled in the eye to achieve a pain free procedure. The patient is made to lie under the laser machine and asked to fix his gaze at a red light. A special machine called the microkeratome is used to pick up a thin corneal flap of 160 microns (equivalent to an onion skin). Laser is delivered to the cornea under this flap to correct the spectacle number. It takes 20 to 60 seconds to complete the laser delivery to one eye. The corneal flap is placed back in position where it holds strongly within two minutes due to its natural bonding properties. The entire procedure takes about 10 minutes.
How safe is this procedure?
C-Lasik is a very safe procedure but like any other surgical procedure it can have some complications which are extremely rare if a proper screening check is done prior to the procedure. This includes measuring the corneal thickness with an ultrasound, Orbscan analysis of the cornea and a retina check. Nobody in our surgical experience has ever lost sight due to this procedure.
What precautions do i need to take before and after Lasik?
You should avoid wearing contact lenses for 1 week (at the least 3 days) prior to lasik. On the day of lasik avoid any form of facial and eye cosmetics and perfumes.After lasik , you can resume all your routine activitie in 2-3 days. However, if your profession involves excessive computer use then it is advisable to wait for one week before resuming your work.
What is retinal detachment?
The retina is the light-sensitive layer of tissue that lines the inside of the eye and sends visual messages through the optic nerve to the brain. When the retina detaches, it is lifted or pulled from its normal position. If not promptly treated, retinal detachment can cause permanent vision loss.
In some cases there may be small areas of the retina that are torn. These areas, called retinal tears or retinal breaks, can lead to retinal detachment.
What are the different types of retinal detachment?
There are three different types of retinal detachment:
A tear or break in the retina allows fluid to get under the retina and separate it from the retinal pigment epithelium (RPE), the pigmented cell layer that nourishes the retina. These types of retinal detachments are the most common.
- Tractional In this type of detachment, scar tissue on the retina's surface contracts and causes the retina to separate from the RPE. This type of detachment is less common.
- Exudative Frequently caused by retinal diseases, including inflammatory disorders and injury/trauma to the eye. In this type, fluid leaks into the area underneath the retina, but there are no tears or breaks in the retina.
Who is at risk for retinal detachment?
A retinal detachment can occur at any age, but it is more common in people over age 40. It affects men more than women, and Whites more than African Americans.
A retinal detachment is also more likely to occur in people who:
- Are extremely nearsighted
- Have had a retinal detachment in the other eye
- Have a family history of retinal detachment
- Have had cataract surgery
- Have other eye diseases or disorders, such as retinoschisis, uveitis, degenerative myopia, or lattice degeneration
- Have had an eye injury
What are the symptoms of retinal detachment?
Symptoms include a sudden or gradual increase in either the number of floaters, which are little "cobwebs" or specks that float about in your field of vision, and/or light flashes in the eye. Another symptom is the appearance of a curtain over the field of vision. A retinal detachment is a medical emergency. Anyone experiencing the symptoms of a retinal detachment should see an eye care professional immediately.
How is retinal detachment treated?
Small holes and tears are treated with laser surgery or a freeze treatment called cryopexy. These procedures are usually performed in the doctor's office. During laser surgery tiny burns are made around the hole to "weld" the retina back into place. Cryopexy freezes the area around the hole and helps reattach the retina.
Retinal detachments are treated with surgery that may require the patient to stay in the hospital. In some cases a scleral buckle, a tiny synthetic band, is attached to the outside of the eyeball to gently push the wall of the eye against the detached retina. If necessary, a vitrectomy may also be performed. During a vitrectomy, the doctor makes a tiny incision in the sclera (white of the eye). Next, a small instrument is placed into the eye to remove the vitreous, a gel-like substance that fills the center of the eye and helps the eye maintain a round shape. Gas is often injected to into the eye to replace the vitreous and reattach the retina; the gas pushes the retina back against the wall of the eye. During the healing process, the eye makes fluid that gradually replaces the gas and fills the eye. With all of these procedures, either laser or cryopexy is used to "weld" the retina back in place.
With modern therapy, over 90 percent of those with a retinal detachment can be successfully treated, although sometimes a second treatment is needed. However, the visual outcome is not always predictable. The final visual result may not be known for up to several months following surgery. Even under the best of circumstances, and even after multiple attempts at repair, treatment sometimes fails and vision may eventually be lost. Visual results are best if the retinal detachment is repaired before the macula (the center region of the retina responsible for fine, detailed vision) detaches. That is why it is important to contact an eye care professional immediately if you see a sudden or gradual increase in the number of floaters and/or light flashes, or a dark curtain over the field of vision.
What research is being done?
A nationwide clinical trial that compared the use of silicone oil with long-acting intraocular gas for repairing a retinal detachment caused by proliferative
Vitreoretinopathy (PVR). With PVR, cells grow on the surface of the retina causing it to detach. This is a serious complication that sometimes follows retinal detachment surgery and is difficult to treat. The results indicate that both treatments are effective and give the surgeons more options for treating these difficult cases.
What exactly is a cataract?
A cataract is a cloudiness of the eye's natural lens, which lies between the front and back areas of the eye.
Are cataracts found only in older people?
About half of the population has a cataract by age 65, and nearly everyone over 75 has at least one. But in rare cases, infants can have congenital cataracts. These are usually related to the mother having German measles, chickenpox, or another infectious disease during pregnancy, but sometimes they are inherited.
My doctor says I have a cataract, but he wants to wait a while before removing it. Why?
A cataract usually starts very small and practically unnoticeable but grows gradually larger and cloudier. Your doctor is probably waiting until the cataract interferes significantly with your vision and your lifestyle.
You need to continue to visit your eye doctor regularly so the cataract's progress is monitored. Some cataracts never really reach the stage where they should be removed.
If your cataract is interfering with your vision to the point where it is unsafe to drive, or doing everyday tasks is difficult, then it's time to discuss surgery with your doctor.
Is cataract surgery serious?
All surgery involves some risk, so yes, it is serious. However, cataract surgery is the most commonly performed type of surgery in the United States. Many cataract surgeons have several thousand procedures under their belt. Choosing a surgeon with this much experience will reduce the risk of something going wrong.