What you should know about colored contact lenses?The color contact lens has become an indispensable accessory for men and women. It can change the eye's color and enlarge the eyes. Whether it's heavy or plain make-up, it can make your eyes more vivid and charming.
Different colors of contact lenses have various effects. For example, brown makes the eyes watery. Black makes your eyes big and round; the gray-blue color makes you tearful in an instant. The purple is very Lolita. So how can I choose a pair of lenses that suit me? Let's focus on a few elements of colored contact lenses below.
The degree includes the degree of prescription and astigmatism. Contact lenses can correct slight astigmatism. Generally speaking, the lower the water content, the better the astigmatism correction effect. For example, color contact lenses with 38% water content can correct astigmatism within 200 degrees. But if astigmatism is higher, it needs to be customized, but the price will be very high.
If you haven't got myopia, you can select Plano, that is, 0-degree lenses. A person with a prescription can pick them according to the actual degree. The degree range and interval of different brands are different. Generally speaking, between 100-500 degrees, there is a gear every 25 degrees. Between 550-800 degrees, 50 degrees one gear. When purchasing, you should choose a lower degree than your actual degree. Because too high a degree may cause dizziness and other symptoms. When putting the lenses in the glasses case, please take a note to distinguish the left and right eyes. Especially in the case of two lenses with different powers, avoid discomfort caused by cross-wearing.
Also, note that the power of frame glasses and contact lenses are not the same. When choosing color contact lenses, the degree should be the same as that of the contact lens. If you were wearing frame glasses before, you could go to the eyeglass shop to test the degree of contact lenses (usually free). If you find it troublesome, you can refer to the following method.
2. Base arc.
The base arc refers to a radius of curvature, which determines the arc of the color contact lens. The smaller the base arc, the greater the curvature of the glasses. The curvature of the eyeball refers to the curvature of the cornea. If the base curvature is smaller than the eyeball, the lens is too flat and easy to shift. If the base curvature is larger than the eyeball, it means the curvature is too large. After wearing it, you will feel uncomfortable.
The base curve is an important indicator when choosing glasses. Your corneal curvature plus 0.4~0.8 is the range of base curves suitable for your contact lens. An unsuitable base curve lens will not only be uncomfortable to wear, which may even cause the wear of cornea.
Diameter and coloring diameter
It generally refers to the diameter of the entire lens, which is the overall diameter of the eyeball covered by the lens. No effect on magnification and beauty effects
Generally, the diameter of a color contact lens is 13.8-14.5 mm. The smaller the diameter, the more the eyeball is in contact with the air, and the more comfortable it is.
However, when selecting a pair of contact lenses, you should look at the diameter and the coloring diameter. The coloration diameter determines whether the color contacts enlarge your eyes.
Generally speaking, if you want to choose a natural style of contact lenses, the coloring diameter is about 13.5 mm. If you want to enlarge your eyes, you can also get one within 13.5-14.2 mm. Coloring of contact lenses with a large diameter can easily cause the effect of "fake eyes".
4. Water content.
We must know that the higher water content is not always better.
With high water content, the lens is softer and comfortable to wear. However, the disadvantage is that it will easily be deformed after a long time. Wearing for a long time will suck back moisture and cause dry eyes. And to make high water content, the thickness of the beauty contact lenses will increase; it will further block the oxygen exchange between the cornea and the air. The longer the wearing time, the more severe the hypoxia; it will cause keratitis and corneal edema.
5. Oxygen permeability.
What is the oxygen transmission rate of a color contact lens? Oxygen permeability refers to the degree to which oxygen passes through the lens to feed the cornea. Oxygen permeability is an important indicator to measure the quality of color lenses. The higher oxygen permeability, the more comfortable it is to wear and the healthier the eyes.
The oxygen permeability coefficient of the contact lens must be 20 when the eyes are open and 125 or more when the eyes are closed. Therefore, try not to close your eyes for a long time when wearing color contact lenses; it is best to remove them for more than half an hour.
6. Center thickness.
Lightweight and comfortable contact lenses are the first choices for wearers. Because such lenses will not produce foreign body sensations when worn. The thinner the lens, the higher the oxygen permeability, and the more comfortable it is.
＜0.04 mm, belongs to the ultra-thin type.
0.04-0.09 mm belongs to the standard type.
＞0.09 mm is a thick type.
The higher the degree, the thicker the center thickness.
There are mainly three common materials for color contact lenses: ordinary materials/non-ionic materials/silicone hydrogel materials.
Let me give you an explanation about the difference between the three materials of color contact lenses:
* Ordinary material.
Features: affordable, soft, and comfortable.
Disadvantages: low water content, easy to cause protein precipitation, poor oxygen permeability.
Suitable for the crowd: healthy eyes with strong adaptability.
* Non-ionic material.
The non-ionic material is a large amount of NVP added to the hydrogel material. It makes the lenses thin and soft; it is not easy to produce protein precipitation. At the same time, it is not easy to age, which improves the life of the lens.
Features: High oxygen permeability, not easy to produce protein precipitation, not easy to produce foreign body sensation.
Suitable for the crowd: Sensitive eyes prone to foreign body sensation and red blood streaks.
* Silicon hydrogel material.
The silicone hydrogel material is made of silicon added to the hydrogel material. It makes the lens more moisturizing, thereby improving the moisturizing effect of the lens. The oxygen permeability is 4-7 times that of ordinary materials, effectively reducing the lack of oxygen in the eyes, long-term wear, and easy fatigue symptoms.
Features: high moisture retention.
Disadvantages: due to the addition of silicon, the lens is hard and not suitable for sensitive eyes.
Suitable for the crowd: dry eyes that are prone to fatigue.
Comparison of three materials:
8. Use period.
The usage cycle of color contact lenses includes daily, quarterly, half-yearly, and yearly. It means that the period of use is one day, one quarter, six months, one year and then discarded. It is worth noting that this period does not refer to the time of wearing, but refers to the life of the lens after opening.
The longer the color contact lenses are worn, the more likely it is to cause protein precipitation and reduce the oxygen permeability and water content, which greatly reduces the comfort. Therefore, it is necessary to pay attention to the cleaning and daily maintenance of the lenses when wearing long-term lenses.
For first-time buyers, you don't need to the color contact lenses store near me, you can buy directly online. Convenient, fast, and affordable.
Having said so much, I believe that you've got how to choose your color contact lenses, so what should you know after getting the color contact lenses?