OK mirror generally refers to orthokeratology mirror.
Orthokeratology mirror is made of breathable hard contact lens material, also known as RGP material. RGP is the abbreviation of Rigid Gas Permeable, which is "breathable hard material". It is developed on the basis of airtight hard material PMMA. The "OK mirror" often seen in the market is actually a orthokeratology mirror.
Extended data
OK how to wear the mirror:
Method 1:
Place the inner curved surface of the lens upward on the fingertip of the right index finger and drop a drop of soothing liquid on the concave surface of the lens. When the wearer looks straight ahead, open the upper eyelid with the index finger of his left hand and fix it on the eyebrow arch, open the lower eyelid with the middle finger of his right hand, and gently place the lens in the center of the cornea. Loosen the lower eyelid first, then loosen the upper eyelid, and blink slightly to ensure that the lens is attached to the cornea in front of the mirror.
Method 2:
Open the double eyelids with the index finger and thumb of the hand wearing glasses, and put the lens on the fingertip of the index finger of the other hand as close as possible. Gently place the lens in the center of the cornea, first loosen the lower eyelid, then loosen the upper eyelid, and blink slightly to ensure that the lens is placed on the cornea in front of the mirror.
Note: You can put a mirror in front of your eyes. When wearing a mirror, open your eyes at the same time and let your eyes fix one of the mirrors. When wearing glasses, you should control the rotation of your eyes. In addition, before slowly releasing the finger pulling the eyelid, you should ensure that the lens is safely placed on the cornea. Premature release may cause the lens to shift or fall off. In addition, the immersion time of the lens must be more than 4 hours before wearing.
Baidu encyclopedia: orthokeratology mirror