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What is the curvature of contact lenses?

What is the curvature of contact lenses?

, by mamoonsky, 4 min reading time

This is what you need to know to find the most comfortable contact lenses!

The curvature of a contact lens is the radius of curvature of the front surface of the lens, usually expressed in millimeters (mm). This curvature determines the curvature of the contact lens, which in turn affects the fit and comfort of the contact lens. The curvature of a contact lens is very important because it directly affects the fit and comfort of the contact lens. If you don't choose the right curvature for your contact lenses, it can lead to eye discomfort, blurred vision, and even eye problems. If you feel uncomfortable or have a foreign body sensation when you wear contact lenses, it's probably related to the curvature of the lenses.
What is the curvature of contact lenses? Is the curvature of contact lenses important? Have you ever felt discomfort or a foreign body sensation when wearing contact lenses? It could be related to the curvature of your contact lenses! In this article, we will introduce you to contact lens curvature, contact lens curvature conversion, contact lens curvature optometry, etc. to help you find the most suitable contact lenses!

 

What is the base curve of contact lenses?


(A) What is BC (Base Curve)?
Contact lens curvature, also known as BC, is a value that describes the degree of curvature of the contact lens and the eyeball match, that is, the radius of curvature of the contact lens, different from the contact lens degree, BC is used to indicate how the inner surface of the lens fits the eyeball.
(The BC is used to indicate how the inner surface of the lens conforms to the eyeball!
The curvature of the Asian eyeball is generally between 8.4mm-8.7mm, and when converting to contact lens curvature, it is recommended to leave 0.8 - 1.0mm of space to avoid being too loose or too tight, so as to allow contact lenses to move within a comfortable range.

On the market, contact lenses usually range from 8.3 to 9.0 degrees of curvature. A smaller curvature means a curvier lens surface, while a larger curvature means a flatter lens surface. Based on the measured curvature value, we can decide which contact lens curvature is most appropriate.

Why is the curvature of contact lenses so important?


A proper curvature ensures a stable and comfortable fit on the eyeball. The right curvature provides good ventilation and comfort, minimizing the sensation of foreign objects, as if you were not wearing glasses.
However, wearing contact lenses with improper curvature may lead to pressure on the eyeballs, lack of oxygen, dryness, redness, swelling, inflammation, blood filaments, and even scratching of the cornea, resulting in blurred vision and inability to properly correct vision under prolonged wear.

How to determine the appropriate curvature of contact lenses?


Professional Examination
Since the curvature of contact lenses may be different for each individual, you can go to an ophthalmologist (clinic) or an optician to have the curvature of your eyeballs measured and recommend the appropriate curvature of contact lenses for you.

Trial fitting
Even if you get the recommended curvature after a professional examination, you can reduce the risk of a bad fit if you try on contact lenses before you buy them. Trying on contact lenses ensures optimal fit, comfort and vision correction.

Pay attention to how you feel when you wear them
If you feel that your contact lenses are moving too much, are too tight, or are otherwise uncomfortable, it may be a sign that the curvature is not fitting properly. Prolonged wear of inappropriate curvature may lead to pressure on the eyeball, lack of oxygen, or other health problems, so if you experience any of these conditions, it is recommended that you stop wearing the device and seek professional advice from your ophthalmologist and optometrist.
Discuss with your ophthalmologist or optometrist

If you have a problem with your lenses, or have questions about the recommended fit, it is important to talk to your ophthalmologist or optometrist. They will be able to give you professional advice or recommend other suitable options.

Consider the material and brand of the eyewear

Different materials and brands may have slightly different curvature recommendations, so it is advisable to pay more attention to them before purchasing!

How to see the curvature of contact lenses?


After understanding the importance of the curvature of contact lenses, how to look at the curvature of contact lenses when buying products? Usually contact lens curvature can be found in the contact lens packaging information, although different brands of contact lenses in the packaging labeled curvature of the location may be different, but as long as you find the value of BC on the lens case, on behalf of the product's contact lens curvature!

The above is the introduction of the curvature of contact lenses, eyes are the window to the soul, we must understand more when buying related products, choose the most suitable contact lenses for yourself, in order to wear comfortable and safe! Do you want to know more about eyes? Or are you searching for different brands of contact lenses? No matter what kind of information you are looking for, followlens has it all!


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