Only-at-night Contact Lens for Sight Correction; Alternative to Lasik Surgery?
Corneal Refractive Therapy Overnight Lenses reshape the cornea while the patient sleeps; he can see with the contacts in. He then enjoys clear sight during the day.
CRT lenses received FDA approval in 2002. The CRT lenses work best on people with nearsightedness up to –6.00 diopters, with or without astigmatism. They aren't available in bifocal or farsighted prescriptions yet.
Lasik flattens the cornea by removing tissue. CRT lenses also flatten the eye, but no permanent change is made to the eye.
The daily night-time treatment gives clear sight during the day. After the eye adapt it may take as long as 72 hours for the treatment to wear off.
It is not really a substitute for Lasik surgery. However it is an alternative for younger patients who aren't eligible for the eye surgery because their eyes still are changing or for patients for whom Lasik is not an option.
To me it is similar to Nocturnal Haemodialysis versus kidney transplantation. Nocturnal hemodialysis allows freedom during the day but doesn't cure the disease. Kidney transplant cures the disease. The analogy shouldn't however be stretched further. Unlike kidney transplant, which may come with lots of post-operative complications and requirements of life-long treatment with immunosuppresives, Lasik surgery is much much safer and uncomplicated. In fact there can really be no comparison on that front. Lasik surgery is a 'cure" in every sense of the word.
Optometrists create a topographical map of the eye to create customized lenses. It takes several visits to fit the lenses.
Studies have shown CRT lenses can return over 90 percent of patients to 20/40 vision, which is the legal driving standard. Nearly 60 percent return to 20/20 vision.
Source: Lansing State Journal
Filed under Contact Lens, Eye Treatment, Lasik Eye Surgery, Refractive Eye Surgery |
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