No need to go to the hospital. Large glasses will do.
Selection of optical shops
Contact lenses are a medical and health care product, so optical shops are required to have good fitting conditions. First of all, the store should be clean and bright, and equipped with necessary optometry equipment, including computer optometry, comprehensive optometry equipment, and slit lamps. The dressing room should have a bright dressing table, nail clippers, sink, and dryer (if If there is no dryer, please let your hands air dry naturally, do not use paper towels or towels to dry them). At the same time, the store should also have experienced optometrists with national certification and fitting qualifications to conduct pre-fitting examinations for the wearers. Optical shops that have obtained international quality system certification are your first choice.
Selection of contact lens products
Complete accurate refraction and eye examination through correct fitting procedures, because there are many types of contact lenses on the market, each with its own opinions, and the wearer It is very necessary to have a certain knowledge of contact lenses to choose a suitable pair of lenses.
First of all, contact lenses are divided into two categories: traditional and disposable contact lenses according to the wearing cycle. From the perspective of future development trends, disposable contact lenses are undoubtedly a healthy and fashionable choice. At the same time, you also need to understand the performance and technical parameters of some lenses, whether they have product registration certificates and certificates of quality, such as the oxygen permeability of the lenses, because sufficient oxygen supply is an important factor in ensuring healthy glasses, as well as the production technology and process of the lenses, etc. wait. It is worth consumers’ attention that contact lenses with “ultraviolet protection function” are a consideration when choosing contact lenses? In this regard, Wu Huiqun, professor of ophthalmology at the Third Affiliated Hospital of Beijing Medical University, expressed his views: “When choosing contact lenses, you should consider the corrective effect of the lenses, the health and comfort of the eyes, and not rely on them to block light or ultraviolet rays, let alone Use it instead of sunglasses. Otherwise, it will cause damage to the eyes."
Technical reference for optometrists to choose suitable lenses
01. Diameter selection (DIA)
---The maximum straight-line distance between two points corresponding to the edge of the lens is called the lens diameter.
Generally, the edge of contact lenses should exceed the limbus of the cornea by 1 to 1.5mm, so that it can be stably attached to the cornea.
--- Method: Use the visible iris diameter as a reference, and then add 2 to 3 mm to this value to determine the lens diameter that should be selected.
---The average cornea diameter of Chinese people is about 11.5 to 12 mm, so it is more appropriate to choose a lens diameter of about 14 mm. Currently, the lens diameter of Bausch and Lomb products ranges from 13.5 mm to 14.5 mm.
02. Selection of base arc (BC)
The radius of curvature of the optical center area of ??the inner surface of the lens is called the base arc, and the unit is mm. The base curve is related to the tightness of the contact lens fit, but because the soft contact lens lenses are soft and can naturally fit the cornea, the base curve is not critical for soft contact lenses. In order to be consistent with the spherical shape in the center of the cornea and the gradual flattening of the edges, Bausch & Lomb's lens products mostly adopt an elastic arc design method to perfectly fit the cornea, making the lens fit more ideal and suitable for most people. Wear it.
03. Selection of moisture content
Moisture content refers to the percentage of water in the total weight of the contact lens material after it is saturated with water. The choice of water content is related to the individual's tear secretion. People with normal or excessive tear secretion are suitable to choose products with a high water content, which can increase the instant moist feeling when worn. People with low tear secretion and dry eyes are suitable to choose products with a low water content to avoid lenses and The eyes compete for water, causing dry eyes.
04. Selection of lens thickness
The vertical distance between the inner and outer curved surfaces of the lens is called the thickness. Generally, we use the center thickness of the -3.00D lens to calculate it. Wearers with dry eyes should choose thicker lenses. Lenses that are too thin can easily cause lens dehydration, which in turn aggravates the dryness of the eyes. First-time customers with lower prescriptions can wear standard-thickness lenses, which are more convenient to wear. Those with higher refractive power should choose thin lenses to increase oxygen permeability and comfort. For those with astigmatism, if the astigmatism degree is below -0.50DC, you can choose thicker lenses. For those with astigmatism degree =>-0.75DC, astigmatism contact lenses should be the first choice.
05. Color selection
Operational color: (does not change eye color)
---The wearer is not skilled in movements.
---The wearer has lost lenses multiple times.
--- Difficulty in near vision due to refractive error, such as high myopia, presbyopia, etc.
06. Selection of lens material
--- For wearers with a lot of eye secretions or tear impurities, they can choose non-ionic material lenses, and be careful to choose disposable lenses as much as possible And appropriately shorten the daily wearing time of lenses.
---Wearers who are sensitive to corneal hypoxia can choose high oxygen permeability or silicone hydrogel lenses to increase the oxygen permeability of the lenses.
What should you pay attention to when caring for contact lenses?
01 Care and soak the lenses in strict accordance with the prescribed procedures. The soaking time should be no less than 4 hours.
02 Avoid using excessive force when removing the lens to prevent lens adhesion. If adhesion occurs, do not tear hard. The lens should be placed in the palm of the hand, add a few drops of care solution, and rub gently until the adhesions are separated. In addition, if you drop some contact lens lubricant (such as Bausch & Lomb Runming's new concept contact lens lubricant) before removing the lenses, the lenses will be easier to remove and will not stick.
03 After using hand sanitizer with disinfectant ingredients, rinse your hands with plenty of running water, or use neutral and non-irritating Bausch & Lomb Runming protein-removing care solution to rinse the fingers that will handle the lenses. .
04 Do not use used care solution to treat lenses again.
05 If the Runming Protein Removal Care Solution is not used up 4 months after opening the bottle, please stop using it.
06 When the lenses are not worn for a long time, they can be stored in a lens box with a tight lid and filled with fresh Runming protein-removing care solution for 30 days. Before use again, rinse with Runming Protein Removing Care Solution before wearing.
07 The most scientific cleaning method at present is to clean the lenses with clean hands. Cleaners launched on the market often cause lens damage that is invisible to the naked eye. The surface of the damaged lens is rough and not smooth, which can easily cause wearing discomfort and corneal abrasions. Therefore, we do not recommend wearers to use cleaners. Now, Bausch & Lomb's Runming Protein Removing Care Solution brings greater convenience to contact lens users, saving contact lens care time, reducing accidental damage to lenses, and ensuring healthy wear.
08 When wearing contact lenses, stay away from irritating substances. Direct or indirect contact will contaminate the lenses and cause eye discomfort, especially spicy food. Once in contact with the eyes, it will be very irritating. of intensity. Therefore, you must wash your hands thoroughly before wearing the lenses. Once you come into contact with irritants, you must remove the lenses and clean the contact lenses thoroughly and repeatedly, or temporarily stop wearing them for a few days and soak the lenses for a period of time until the symptoms completely disappear. If you still feel discomfort, it is recommended that you review your eyes and replace them with new lenses.
09 When storing contact lenses, make sure the lenses are completely soaked in the care solution. Once the lens is dehydrated, it can cause the edge of the lens to be out of round (except for edge damage), which will cause eye discomfort after wearing it. If you find that the edge of the lens is not round, please immediately soak the lens in the care solution until the lens returns to its original shape and then check whether there is any damage to the lens. If there is no damage, you can continue to wear it. If there is a problem, please go to the optician for review.
10 To prevent confusion between the left and right lenses, first of all, develop the habit of putting on and taking out the lenses from the right eye first (right first, then left). You can also use a lens case with left and right markings to help distinguish, so as to avoid mixing up the lenses for the left and right eyes. If the left and right lenses are mixed up, you can swap the left and right lenses for a trial fit, or go to the original optician to ask a professional to help solve the problem.
11 Do not use hydrogen peroxide to care or clean any colored lenses, because long-term use will cause the colored part of the lens to fade, but it will not cause damage to the eyes.
12 Avoid using alcohol to clean contact lens cases, because when the alcohol is not completely rinsed away, the lenses will be contaminated by the chemical components in the alcohol and damage the lenses. The correct way to care for the mirror box is to brush the mirror box with a soft brush every week, rinse it with care solution, and replace it every month.
13 The nails of the fingers that frequently handle lenses should not be kept too long, otherwise the lenses and eyes may be easily injured. After applying nail polish, wait until the nail polish is completely dry before touching the lenses and care solution.
14 It should be replaced regularly in strict accordance with the usage requirements of the product, and should not be worn for extended periods of time. Except for ultra-long-wearing lenses (such as Bausch & Lomb's "Pure Vision" products), other lenses cannot be worn overnight. It is best to wear it no more than 12 hours a day. Because contact lenses will have precipitates adsorbed on the lenses from the moment they are put into the eyes. Even if they are cleaned every day, they cannot be completely removed (although they are invisible to the naked eye). The precipitates will irritate the eyes and cause some adverse reactions. Therefore, the lifespan of contact lenses starts from the date of opening, no matter how many times they are worn, they must be replaced regularly.