Basic knowledge of colored contact lenses

THE CLASSIFICATION OF COLOR CONTACT LENSES

1.By abandonment cycle : Daily Contact Lens 、Monthly contact Lens、Half a year contact Lens and Yearly contact lens.   

  • yearly Contact Lens :Material is best, Good formability , cost performance is high, above the choice of design and color an be more diversity,but Nursing is more troublesome, it is easy to breed bacteria.

  • Monthly Color Lens:more convenient and hygienic, water content and softness is better. but  price is higher than the annual lens, and the material is relatively poor.

  • Daily Contact Lens: easy to use, can be lost when used up, daily replacement is more sanitary. But the price of the daily lens is more expensive, the material is relatively poor and the comfort is lowest .

2.By texture  

  • Silicone Hydrogel:Silicone is added to the hydrogel material to make the lens more moisturizing, thus improving the moisturizing effect of the lens. The oxygen permeability is 4-7 times that of common materials, which effectively reduces the lack of oxygen in the glasses and the fatigue of wearing for a long time.

  • 2-HEMA/Polymacon:This is considered a low hydration hydrogel of nonionic polymer and is a common material used in the manufacture of contact lenses.

  • Non-ionic: A large amount of NVP is added to the hydrogel material, so that the lens becomes thin and soft and is not easy to produce protein precipitation, and it is also not easy to age, which improves the life of the lens(fit for Sensitive eyes prone to foreign body sensation and redness ).

DIAMETER OF COLORED CONTACT LENSES

The diameter of the color contact lens is divided into the diameter of the color contact lens and the diameter of the color. The diameter of the color contact lens refers to all, including the transparent part without color, and the diameter of the color refers to the part of the color of the lens that covers the eyeball.

BASE CURVE OF COLOR CONTACT LENSES

The base curve is the curvature of the eyeball from the side. Our eyeball is a sphere, and the lens is also curved, If the curvature is not suitable, and the phenomenon of the slider will generated. The sliding piece is the blinking eye lens that swings up and down. Generally, the large diameter and base curve of the contact lens and small diameter is not suitable for oneself will happen this phenomenon.

COLORED CONTACT LENSES CONTAIN WATER

The higher the water content, the more the eye absorbs water, and the easier dry out. Average contact lens water content is between 36% to 38% it is very moisturizing.The selection of water content of the medlar is determined by the length of wear.The shorter the wearing time, the higher the water content of the lens is, the more comfortable it is.If over 8 hours ,around 38% will be best .

PRESCRIPTION OF COLORED CONTACT LENS

When choosing the degree, you should lowering the degree, which is lower than the degree of the glasses with the frame. Because contact lenses are attached to our eyes, prescription that are too high will be very tired. If the frame is 1.0 vision, then the prescription of contact lens is reduced by 25 degrees or 50 degrees.Many people with framed glasses will have some astigmatism more or less. In fact, astigmatism is obscure, and has nothing to do with the degree of glasses. Contact lenses do not have astigmatism. If the degree of astigmatism is not very high, it does not affect the beauty.

WEAR & CARE

1.Tips for wear

  • Step 1: Take the lens out from the packet gently after washing and drying your hands.Then make sure the correct side of the lens.

  • Step 2:Hold up your upper eyelid and pull down your lower lid,then use the first finger to gently place the lens.

  • Step 3:Looking up and down,left and right after putting the lens in so that it will settle into place,then closed your eye in a while.

  • Step 4:Do again for the other eye through simple steps!

2.Tips for remove

  • Step 1: Wash and dry your hands thoroughly before touching your eyes.

  • Step 2:Use your clearly hand to gently pull down your lower eyelid,then pull up your upper eyelid.

  • Step 3:Using your first finger and thumb to pinch the lens gently.

  • Step 4:Look up and slide the lens down gently so that the lens will keep it in your eye,then off onto finger.Do again for the other eye.

3.Tips for care

  • Wash the case :wash it under running water fist ,Disinfect the plastic box with hot water (do not use boiling water, it will take the bad chemical position out of the plastic box or even burn the box)and dry the case until without water stain.

  • Wash the contact lens: Clean your hand ,put the solutionon the lens in the palm of your hand and gently radiate the front and back of the lens with your forefinger.

  • Soak the lenses in a fresh solution(Even if we don't wear contact lenses, we need to change the lotion every 2-3 days,A bottle of solutionneeds replacing after 3 months).

    TIP FOR PEOPLE WHO WEAR CONTACT 

    LENSES FOR THE FIRST TIME

    When you wear the contact lens for the first time, you should gradually increase the wearing time. If you wear it for too long, it will lead to lack of oxygen in the eyeball and cause discomfort.

    Day 1: 2 hours - 4 hours

    Day 2: 6 hours

    Day 3: 8 hours

    Day 4: 10 hours

    Do not wear more than 12 hours per day

    When you first wear contact lens, you may have mild dryness, foreign body sensation, photophobia, blurring, etc. These are normal reactions. If you weat them for one to two weeks, the symptoms will disappear. If the symptoms persist or worse, stop using them immediately. And go to the regular hospital for eye examination.