The sun emits electromagnetic waves of different wavelengths, which are transmitted through the atmosphere to the surface of the earth. They are divided into visible light, such as the seven colors of the rainbow, and invisible light, including infrared and ultraviolet. Among them, ultraviolet light has a great impact on human health. A small amount of ultraviolet light can help the body produce vitamin D, but when exposed to large amounts, it may affect the body and even damage the health of the eyes. The effects of ultraviolet rays on the eyes can be divided into acute and chronic. Acute refers to the effect of a large amount of ultraviolet rays entering the eyes. Performing welding work, water skiing, skiing for several hours without wearing protective goggles, will burn the cornea due to exposure to a large amount of ultraviolet rays. The main symptoms are eye irritation, photophobia, tears, and red eyes. Chronic refers to eye diseases caused by UV damage over the years. Because ultraviolet rays have the chance to damage the health of the eyes, we should pay more attention to protect our eyes from ultraviolet rays. Try to avoid going out when the sun is strongest, and wear a hat or use an umbrella to shade when going out. You should also wear sunglasses when you are outdoors. One is to filter ultraviolet rays, and the other is to reduce the strong light from entering the eyes, making the eyes more comfortable to see. Sunglasses are used to protect the eyes from ultraviolet rays. Pay attention to the color of the lenses. Very dark ones are not necessarily the best, because the lenses also need to allow 10 to 30% of the light to penetrate, so that the eyes can see comfortably and naturally. Gray allows the color of all light to penetrate uniformly, which is a good choice. Brown and green are also good choices. Blue and purple allow more blue and violet light close to the ultraviolet wavelength, which is easy to damage the eyes. In terms of the design of the glasses, it is better to cover the eyes, which can prevent the eyes from being damaged by the ultraviolet rays refracted from all directions.
Precautions for the use of orthokeratology lenses During the wearing process, some uncomfortable sensations may occur due to changes in the shape of the cornea or problems with the offset of the lens, such as double vision, fluctuations in vision, glare, etc. These must be handled according to the doctor’s requirements. In the process of wearing glasses, some children may need to stop wearing the plastic lens for various reasons, or even give up wearing the plastic lens altogether. These must be handled according to the doctor’s requirements. 1. . Generally, the service life of the lens is about one year, if it is used for a long time, it may affect the correction effect. And affect the health of the eyes. 2. . The care solution expires three months after opening. The lens box and suction stick are replaced once a month or two. Please do not use expired products to care for the lenses. 3. . If you stop wearing the lens for a long time, please change the care solution every 1 to 2 days. If you don’t wear glasses for more than three months, you need to check again before wearing glasses. 4. . Please don’t rub your eyes vigorously after wearing the glasses, so as not to rub off the lenses or scratch your eyes.  .
When bubbles enter under the orthokeratology lens (Figure 1), the lens will “press the cornea through the bubbles”, and it is easy to cause “bubble indentation” on the cornea after removing the lens. “Bubble indentation”, the term is “corneal recess”, this is not corneal epithelial shedding, spotting, not corneal injury, but in this case, the effect of shaping will be affected, and the visual quality after removing the lens will also change difference.  .Figure 1 A large number of bubbles under the orthokeratology lens .The more common reason is in the initial stage of wearing the orthokeratology lens. Because the new glasses are worn, the foreign body sensation is relatively strong. After wearing the glasses, the child is easy to squeeze the eyes, blink, etc. The bubbles are easy to enter Under the lens. In addition, improper way of wearing glasses, over-fitting of the lenses, and high vector height can also cause “bubble indentation”.  . Figure 2 Corneal “bubble indentation”-corneal recess . How to avoid bubbles in the lens? Common operating problems and solutions are as follows: children cannot fix their eyes when wearing glasses, the eyeball rotates excessively, and bubbles are easy to enter when wearing glasses. Handling: Communicate with your child well and keep your eyes still while wearing glasses.  . Release the eyelid too quickly after wearing the glasses. Treatment: After the lens is put on the cornea, don’t let go of the upper and lower eyelids immediately, but slowly let go of the eyelids, otherwise the child will easily close the eyes immediately, or even squeeze the eyes forcefully immediately, and bubbles will easily enter.  . If possible, put your head down and wear glasses. Put eye moisturizing liquid/preservative-free artificial tears into the concave surface of the lens, and wear the glasses with your head lowered, so that the liquid in the concave surface of the lens will not flow out easily and reduce the generation of bubbles.  .Summary When wearing orthokeratology lenses for the first time, factors such as unskilled wearing glasses, foreign body sensation, etc. will easily bring bubbles under the lenses. This situation will generally increase with the wearing time, and the child’s adaptability and wearing glasses proficiency will gradually disappear . Parents pay attention to operation techniques and strengthen the cooperation of children to reduce or avoid bubbles under the mirror. If there are still a lot of bubbles after wearing the glasses for a week, it means that the lens is not well fitted (the vector height is too high) and the lens parameters need to be adjusted.
What should be paid attention to when wearing an orthokeratology lens is mostly used by children around 12 years old, and both parents and children themselves will be a little confused when they start wearing it. After all, a lens is put on the cornea. It is normal to have these concerns and worries. As long as it is used in the correct way, it is still very safe. Here’s how to safely wear the orthokeratology lens. 1. First review system: On the first day of wearing the glasses, you must go to the hospital for review with the orthokeratology lens installed. After that, they came to the hospital for follow-up visits in the first week, the second week, the first month, and the second month. At the follow-up visit, you just need to wear the lens to see the doctor. Follow up every two months thereafter. 2. Fingers used for wearing and removing glasses must be cut short nails; hands should be washed before removing and wearing. 3. When putting on and taking off the glasses, let the child lie on the table for operation, and put a small white towel on the table to prevent the lens from falling on the ground and scratching the lens. 4. If your eyes are red, swollen, painful, photophobic, or tearful during wearing of the glasses, you must stop using the glasses and go to the hospital in time. 5. Try to let the child sleep on his back when wearing the orthokeratology lens. 6. When cleaning the lens, please use the ring finger to gently soften the lens. The action should be gentle when washing, to avoid the lens from contacting hard objects or using excessive force to cause fragmentation. 7. The nails must be cut frequently to avoid damage to the lens. 8. Use special care solution for orthokeratology lens and rigid contact lens. If you keep wearing it, the care solution for soaking the lens needs to be changed once a day. 9. In the process of cleaning the lenses, prepare a clean small basin to avoid losing the lenses by flushing them into the sewer during the cleaning process. 10. During the wearing process, if the child has physical discomfort, such as cold, fever, runny nose, vomiting, diarrhea, etc., please stop wearing it and continue using it when the child’s physical condition returns to normal. 11. If you stop wearing the lens within two weeks, you can change the soaking lens care solution every 3 days. If you stop wearing it for more than 2 weeks, it is recommended to store the lens dry. The method is as follows: first clean the lens with the care solution and rinse with distilled or purified water. , Dip the water on the mirror lens with a paper towel and store it in a dry box. When wearing it again, put the lens in the care solution for 4 to 6 hours before wearing it. 12. The companion box for storing the lenses needs to be changed every 3 months. 13. After the lens has been used for 6 months, the optician should be asked to check whether the lens has scratches and protein deposits during the review. Deal with it if necessary. 14. The validity period of the care solution is three months after opening the lid. 15. After wearing the lens, you need to observe for half an hour in the first month and then lie down to sleep. Do not lie down directly after wearing the lens to avoid deviation; you need to observe for 10 minutes and then lie down to sleep after wearing the lens; You can rest after the mirror. 16. Children under the age of 12 need to be removed and worn by their parents, and children over 12 can be removed and worn under the supervision of their parents.  .
.The method of wearing the orthokeratology lens is prepared according to the previous article “Precautions before wearing the orthokeratology lens”, you can prepare to start wearing the lens. Step 1: Take the lens out of the lens box, with the concave side facing up, drop a few drops of care solution and rub the lens repeatedly until the lens is thoroughly cleaned. Step 2: After using the care solution to clean it thoroughly, rinse it thoroughly with sterile normal saline before wearing it. Step 3: When wearing, put the shaping lens face up, put it on the pad of your index finger, and put 2-3 drops of eye drops into the lens, pull the upper and lower eyelids apart with the middle fingers of your hands, and put on the lens with your index finger Go to the cornea and finish wearing glasses. Step 4: After confirming that the lens is successfully worn, observe whether there are small bubbles around the lens through a mirror. If there are bubbles, ask the patient to put a few drops of eye drops into the eye first, and then blink a few times to observe whether the bubbles disappear. Yes, the lens should be removed and worn again.  .There are two ways to determine whether the lens is successfully worn: open the wearing eye, look in the mirror, you can see the lens on the cornea, and gently rotate with the blinking motion. Cover one eye and see if the vision is clear, which clearly indicates the success of wearing the glasses; if it is not clear, it means that the lens may be still on the finger, or the lens may be worn out or even fall off and needs to be worn again.  .Reminder: Generally, it is recommended to wear the lens 30 minutes before going to bed, or follow the doctor’s advice. It is recommended to wear the lens for about 8-10 hours.  . . . .