Abstract: the effect of corneal plastic lens is temporary. Once stopped wearing, the cornea of most patients will return to the original shape within 7 ~ 10 days, and all patients will return to the original shape 30 days after stopping wearing. Therefore, corneal shaping glasses should be worn for a long time to maintain the shaping effect.
1. What is a corneal plastic lens? The full name of
ortho KCl (ortho KCl) is “hard breathable contact lens for corneal shaping”. It is a kind of hard and high breathable contact lens to correct myopia by changing corneal morphology (rigidgaspermeable contact lenses, RGP). Different from the design of ordinary RGP lenses, the design of the outer surface of ortho KCl is very simple, while the inner surface is relatively complex. Some gaps are created between the inner surface and the corneal surface, and the thin-layer hydraulic action of the tear film is used to redistribute the corneal tissue, flatten the anterior surface of the cornea, and prolong the focal length of the eye after the cornea flattens, resulting in myopia The focus of the incoming light of the eye just moves from the front of the fundus to the retina, so as to achieve corneal shaping and delay the development of myopia. The effect of
corneal shaping lenses is temporary. Once stopped wearing, the cornea of most patients will return to the original shape within 7 ~ 10 days, and all patients will return to the original shape 30 days after stopping wearing. Therefore, corneal shaping glasses should be worn for a long time to maintain the shaping effect.
II. Which groups are suitable for corneal shaping lenses?
over 8 ~ 12 years old, progressive myopia, strong self-care ability of the wearer or parents can assist in wearing. Under the age of 8, the wearer should be carefully followed up by an ophthalmologist.
myopic spherical lens degree is -0.75d ~ -5.50d. The higher the spherical lens degree, the worse the prediction of shaping effect.
corneal diopter (k value) is 40.00d ~ 46.00d, and the K value of corneal flatness is more than 36d different from the expected corrected myopia.
< 1.5D normal corneal astigmatism, < 0.75D irregular corneal astigmatism; the astigmatism is less than 1 / 3 of the sphericity.
corneal e value is larger, and the peripheral part of corneal morphology is more flat.
Central corneal thickness > 0.4mm.
pupil diameter is normal.
intraocular pressure was normal.
have no history of other eye diseases, eye trauma or eye surgery.
have good personal hygiene conditions and hygiene habits, and can follow the doctor’s advice.
have a certain economic ability to bear all the expenses during the treatment period.
have reasonable expectations for the correction effect.
III. which groups are not suitable for wearing corneal contact lenses?
myopia spherical lens power > – 5.50d, regular astigmatism power > 1.50D, irregular corneal shape and obvious lens astigmatism.
cornea is too flat ≤ 39.00d, or too steep ≥ 46.00d.
corneal e value ≤ 0.1, the cornea is spherical, and the corneal e value does not match the refractive error.
pupil diameter is too large.
various eye diseases, such as dry eye, inflammation, glaucoma, exophthalmos, nystagmus, etc.
systemic diseases, such as diabetes, immune system diseases, mental patients, etc.
have unreasonable expectations for the correction effect. The effect of
are worn by those who have poor personal hygiene habits and cannot adhere to the doctor’s advice. The elderly with
have poor corneal compliance, eyelid relaxation and poor correction effect.