What is Ortho-K Lenses?
Ortho-K lens or Orthokeratology. A special gas permeable lens for Myopia control for ages 6-20 years old. Designed to be worn overnight and removed in the next morning. It works by flattening the center of the cornea, changing how light is bent as it focuses on the retina. When the patient wakes up and takes out the lenses, he or she should be able to see clearly throughout a certain period of time during the day without wearing glasses or other contact lenses. These overnight lenses are gas permeable, and hard enough to reshape the cornea, and also allow oxygen to pass through so your eye stays healthy.
WHO UNDERGOES ORTHO-K PROCEDURE
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Those with myopia, astigmatism within the treatment threshold of Ortho K lenses (under 10 diopters for myopia and under 3 diopters for astigmatism).
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Children under 18 years old with refractive errors who are not old enough to perform surgery.
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Children with rapid myopia progression.
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Those with difficulty or discomfort in wearing normal-framed glasses or contact lenses
Ortho-K Lenses
may not be suitable for
Ortho-K
Lenses
of Japan Eye Center
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Those having eye inflammation
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Those having persistent dry eye or tear gland disorder
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Those who are allergic to contact lenses in general
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Those having corneal diseases or keratoconus
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Women who are pregnant or planning to become pregnant or are breast-feeding
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Those having autoimmune diseases or diabetes
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Those having abnormality in corneal structure, conjunctiva, or eyelids
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Those having regular red eyes, often feel stuck inside the eyes
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Those who cannot comply with the prescriptions and instructions of the doctor
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Those who cannot follow routine examination schedule
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Those whose jobs require long-term stable vision
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Those who have irregular astigmatism or unstable corneal refraction
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Those having low sensitivity on the corneal surface
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Those having a history of myopia surgery or other eye ones
HOW TO WEAR
ORTHO-K LENSES
HOW TO REMOVE
ORTHO-K LENSES
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STEP 1: Start putting on the hard contact lenses for about 15 minutes before going to bed.
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STEP 2: Before putting them on, wash your hands with soap and dry them.
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STEP 3: Apply artificial tears to your eyes.
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STEP 4: Wash your lenses with normal saline
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STEP 5: Check if your lenses and irises have any dust.
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STEP 6: Put your lenses on the tip of your pointer finger (dominant hand), and apply 1 drop of artificial tears to your contact lenses.
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STEP 7: Look straight to your mirror, keep your lower eyelid down by your right middle finger, keep your upper eyelid by your 3 left middle fingers, and gently place the lens over your iris.
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STEP 8: Lightly release your eyelids, blink, and close your eyes for a few seconds, look in the mirror to check that your lenses are at the iris center.
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STEP 9: After putting the lenses, pour out the lens-soaking water and leave its tray dry naturally.
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STEP 1: Apply artificial tears to your eyes. Wash your hands with soap.
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STEP 2: Look straight to your mirror, keep your upper eyelid and lower one using your right middle finger and the left one respectively, and squeeze the lens remover in the center or lower 2/3 of the iris, and gently pick up the lens.
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STEP 3: Gently remove the lens from the remover, and wash it with normal saline. Then, put it in the lens soak tray, cover them with lens soaking water, close the tray cover, and then repeat the procedure for the other eye.
POSSBILE EFFECTS
AFTER WEARING ORTHO-K LENSES
Ortho K flattens the central corneal area, but does not change the shape of its periphery and hemisphere which causes differences in refractive power in these three corneal parts. This can cause blurred vision or glare and halo. This condition can cause certain discomfort.
LIKE OTHER TYPES OF CONTACT LENSES, HARD NIGHTTIME CONTACT LENSES CAN ALSO CAUSE SOME EYE SYMPTOMS SUCH AS:
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Tears, red eyes, bulging, entangled, eye mucus
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Dry eyes, sensitivity to light, blurred vision
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Corneal scratch or inflammation
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To avoid those symptoms, you should strictly follow the principles of cleaning, using and preserving lenses as well as re-examine them periodically. In case of getting any of those symptoms, you should inform your doctor for guidance and prescription.