ORTHO-K AND SPECIALTY CONTACT LENSES
Orthokeratology (Corneal Refractive Therapy) is a non-surgical process using specially designed rigid gas permeable contact lenses to gently reshape the cornea while you sleep.
We Are Your Trusted Contact For Orthokeratology (Ortho-K)
Ortho-K is a non-surgical, reversible procedure to reshape the corneal surface. This results is clear and comfortable vision without the use of daytime contact lenses or glasses.
How Is This Done?
This is achieved using a unique therapeutic mold to reshape the cornea while you sleep. The specially designed therapeutic mold which is worn overnight re-sculpts the outermost corneal cells. Fluid forces are created by the therapeutic mold acting on the tear film beneath this lens. This creates a push/pull force beneath the lens surface resulting in an altered corneal shape which results in clear vision.
In addition to correcting daytime vision, Ortho-K has been shown to slow down myopia progression. As a child with myopia (nearsightedness) grows, the length of the eye also grows. This causes myopia to worsen and also opens up risk of potential eye disease. Increasing amounts of myopia also make the eye more susceptible to retinal detachments, and possibly glaucoma. Ortho-K can help to reduce myopic progression.
Who Is A Candidate For Ortho-K?
• Near-sighted patients who are too young for LASIK
• Patients who are not good candidates for some other reason
• Patients with contact lens intolerance due to dry eye syndrome
• Patients who fail at wearing contact lenses
• Children with less than -5.00D of myopia and less than -1.50D of
astigmatism and are interested in slowing down the progression
of their myopia.
How Long Does It Take For Ortho-K To Work?
Most patients will have an initial improvement in 1-3 days, but it can
take up to 2-3 weeks to get full vision correction. As your vision improves every night you may need a temporary pair of eyeglasses or soft 1-day disposable contact lenses for certain tasks until full correction is achieved
Large-diameter scleral lenses are placed on the sclera
and vault over the irregular-shaped cornea of a person with keratoconus. The lens is a bit larger than a normal contact lens. Ask your doctor if scleral lenses are right for you.
Specialty Contact Lenses Are Our Specialty
The History Of Scleral Contact Lenses
While scleral contact lenses are not new, they are in fact making a big comeback. The origin dates back to the 1500’s where Leonardo Da Vinci was known to have invented the concept of a scleral lens. Early models of these lenses were made from glass and its use was very limited due to safety and practical issues associated with glass. In the 1930’s a plastic, polymethylmethacrylate (PMMA) was invented and much of the scleral lens early success can be attributed to its invention. Although PMMA was used in early scleral and rigid gas permeable (RGP) lenses, it did have its fair share of problems which did not make it very popular. Due to reduced oxygen permeability of PMMA, most corneas would have associated edema (swelling) with daily use. With the creation of more oxygen permeable plastics over time, the practicality of using scleral lenses has increased dramatically.
The size of a scleral lens can be daunting at first. Although most are similar in size to a soft contact lens, some can be 1-4mm larger than soft lenses. They are designed to vault completely over the cornea and rest of the sclera (the white of the eye). This makes the lens much more comfortable than smaller RGP lenses and even soft contact lenses. Before insertion into eye it is necessary to put a preservative-free saline into the lens. After insertion of the lens, the eye is bathed in this fluid the entire time you are wearing them, which can be therapeutic to patients suffering with dry eye.
Although there are benefits to the large size of a scleral lens, there are some drawbacks which won’t make this lens as popular. Since the lens is a rigid lens draping over the entire cornea and limbus 360 degrees around, it must be very oxygen permeable to allow the eye to breathe. Although handling the lens is easier than soft and RGPs, the insertion and removal from the eye can be a little more complicated. The fitting process is more complicated than fitting a soft lenses and can take a considerable amount of time. Since the lenses are customized for the unique shape of the patient’s eye, they cannot be mass produced like soft contacts, which makes them considerably more expensive.
A Unique Solution
Scleral lenses represent a unique solution for corneas that have become irregular, or have had suffered trauma. Most irregular corneas are a result of disease such as kerataconus, kerataglobus, or pellucid marginal degeneration. Or they have become irregular as a result of ocular trauma or after refractive surgery such as RK or LASIK. An irregular shaped cornea typically cannot be optically corrected with glasses or soft contact lenses. RGP lenses also might not properly position on top of an irregular cornea resulting in poor comfort and vision. Scleral lenses rest on the normal sclera and vault completely over the diseased irregular cornea, providing a new regular optical surface. This results in visual acuity that is unobtainable with conventional methods (glasses or soft contacts).
Ask Dr. Rajeev To See If Scleral Lenses Are Right For You.