Colored contact lenses are a type of contact lens, but compared to transparent contact lenses, they are thicker and have more patterns (regular contact lenses have a sandwich structure, with transparent sequins on the front and back, and a pattern layer in the middle. Contact lenses don’t have this. Layer pattern layer, inferior color contact lenses are not a sandwich structure, but the first transparent sheet and the second layer pattern layer. The pattern layer directly touches the eyeball and hurts the eyeball). Hereinafter, it is collectively referred to as contact lens. This contact lens is also called corneal contact lens. , Is a kind of lens worn on the cornea of the eye to correct or protect the eye. It is divided into hard contact lenses and soft contact lenses.
#2 The difference between hard contact lenses and soft contact lenses
Rigid contact lenses mainly refer to rigid gas permeable contact lenses (RGP), which have better oxygen permeability, are less likely to cause hypoxia and dry eye, are simple to maintain, and have a long service life; people who have high requirements for degree control or eye health You can choose RGP, but the disadvantage is the lack of comfort, which is not suitable for everyone. It needs to be emphasized that because the fitting process requires high professional nature, RGP can only be made in the hospital.
The advantages of soft contact lenses are softness, itching, comfort and no foreign body sensation. The disadvantage is that it is easy to adsorb and precipitate and has a short life. That is, common contact lenses sold in major optical shops.
#3 Can anyone wear contact lenses?
Contact lenses are not suitable for everyone, how can you simply judge whether you are suitable?
The easiest way is to go to the hospital for an examination, this is the safest.
In addition to this in a general sense,
- Contact lenses are suitable for people with refractive errors, which are usually called nearsightedness, farsightedness and astigmatism.
- People who don't have (except for refractive errors) other eye diseases.
#4 People who are not suitable for contact lenses
- (a) Chronic eye diseases, such as keratitis, dry eye, etc.
- (b) Systemic diseases, such as severe diabetes, chronic sinusitis, rheumatoid arthritis
- (c) Poor personal hygiene, heavy smoking
- (d) Those who are allergic to the ingredients in the care solution
- (e) People with a lot of dust in their living and working environment
#5 How to choose contact lenses?
- (1) Check yourself first and ask your ophthalmologist to see if you are suitable for wearing
- (2) Choose the degree. Generally speaking, the degree of contact lens of people with myopia of 400 degrees or more will be 25-50 degrees less than the frame and it is comfortable to wear, but the opposite is the case for hyperopia.
- (3) Looking at the water content, the higher the water content, the easier it is to evaporate, and it is easier to dry and itchy eyes when worn for a long time.
- But on the other hand, the higher the water content of the lens, the better the oxygen permeability. If you are prone to dry eyes, it is recommended to choose a lower water content.
- (4) Look at the base arc. The base curve is the curvature of the corneal surface. Whether it is comfortable to wear or not is one of the influencing factors. You need to consult a doctor for your specific base arc. If you frequently appear slippery during the wearing process, there are generally two possibilities: inappropriate base curve or quality of contact lens.
- (1) Every time the lens is removed, no matter how long the lens is worn, it should be cleaned and taken care of
- (2) Take care of the full-function nursing solution once a day
- (3) Use protease tablets every week to clear it, which can remove about 70% of the sediment, but it cannot be completely cleaned, so it cannot be used all the time.
#7 Wrong contact lenses can cause a lot of harm
- Cornea hypoxia: Wearing lenses with low oxygen permeability for a long time will lead to hypoxia of the cornea and damage to the corneal epithelium, which will affect vision.
- Allergic reactions: During the process of wearing contact lenses, metabolites in the eyes will be deposited on the lenses. It is manifested as red jelly, eye itching, eye pain, etc., and you need to stop wearing it at this time.
- Corneal injury or infection: If it is not worn properly, it may damage the corneal epithelium, and the eyes will feel uncomfortable, foreign body sensation, light resistance, tearing, etc., and severe keratitis may occur.
- Dry eyes: Wearing soft contact lenses for too long, especially lenses with high water content, contact lenses will absorb moisture on the ocular surface, causing dry eyes, manifested as foreign body sensation, dryness, burning sensation, blurred vision, Increased secretions and so on.
#8 How to wear scientifically, you need to develop 6 good habits
- Be sure to wash your hands before touching the lenses, carefully wash them with clean water and soap, and wait until your hands are completely dry before you can take the lenses.
- Pay attention to the shelf life of the care solution, carefully read the instructions on the packaging of the care solution, how long is the shelf life and how long it can be used after opening (usually 3-6 months). When opening, mark the opening date on the bottle. If it is not used up after the expiry date, be sure to throw it away.
- Use eye drops to lubricate the eyes. When the eyes are dry and the glasses are not worn smoothly, some eye drops that do not contain preservatives or are suitable for the wearer can be used. Note: Use under the guidance of a professional doctor, and strictly control the dosage.
- Keep the contact lens case clean and find a cool and ventilated place to avoid being contaminated by other things.
- Be sure to take off the contact lenses before going to bed. If you do not take off the contact lenses before going to bed, the cornea will be under the stimulation of the contact lenses for a long time and will be in a state of hypoxia for a long time, which will not only increase the chance of infection and cause dry eyes. , And even cause corneal ulcers. This disease that may cause blindness. Strictly speaking, it is best to take down the nap time.
- Please observe your eyes before wearing lenses. Before wearing contact lenses, it is recommended to do a self-examination. If your eyes look strange (redness, itching, etc.), or if you feel uncomfortable, do not wear them for the time being. Rest.
Although contact lenses have a shelf life, please do not use their shelf life. For example, don’t use them for 24 hours a day, don’t use them for a week or a week, and don’t use them every day for the entire month for 30 days. They are invisible. The protein deposits on the glasses cannot be completely removed during cleaning, so this affects its normal life and cleanliness to a certain extent.
Finally, it is not impossible to wear contact lenses, please wear them correctly, so that beauty and health can coexist.